Wednesday, February 5, 2014

Forget global warming, worry about the MAGNETOSPHERE

Forget global warming, worry about the MAGNETOSPHERE: Earth's magnetic field is collapsing and it could affect the climate and wipe out power grids

Earth's magnetic field has weakened by 15 per cent over the last 200 years
Could be a sign that the planet's north and south poles are about to flip
If this happens, solar winds could punch holes into the Earth's ozone layer

This could damage power grids, affect weather and increase cancer rates
Evidence of flip happening in the past has been uncovered in pottery
As the magnetic shield weakens, the spectacle of an aurora would be visible every night all over the Earth

Deep within the Earth, a fierce molten core is generating a magnetic field capable of defending our planet against devastating solar winds.

The protective field extends thousands of miles into space and its magnetism affects everything from global communication to animal migration and weather patterns.

But this magnetic field, so important to life on Earth, has weakened by 15 per cent over the last 200 years. And this, scientists claim, could be a sign that the Earth’s poles are about to flip.

Scroll down for videos...

The Earth's protective field extends thousands of miles into space and its magnetism affects everything from global communication to animal migration and weather patterns

Experts believe we're currently overdue a flip, but they're unsure when this could occur.

If a switch happens, we would be exposed to solar winds capable of punching holes into the ozone layer.

The impact could be devastating for mankind, knocking out power grids, radically changing Earth’s climate and driving up rates of cancer.

‘This is serious business’, Richard Holme, Professor of Earth, Ocean and Ecological Sciences at Liverpool University told MailOnline. ‘Imagine for a moment your electrical power supply was knocked out for a few months – very little works without electricity these days.’

The Earth's climate would change drastically. In fact, a recent Danish study believes global warming is directly related to the magnetic field rather than CO2 emissions.

The study claimed that the planet is experiencing a natural period of low cloud cover due to fewer cosmic rays entering the atmosphere.

The Earth's magnetic field explained

Radiation at ground level would also increase, with some estimates suggesting overall exposure to cosmic radiation would double causing more deaths from cancer.

Researchers predict that in the event of a flip, every year a hundred thousand people would die from the increased levels of space radiation.

'Radiation could be 3-5 times greater than that from the man-made ozone holes. Furthermore, the ozone holes would be larger and longer-lived,' said Dr Colin Forsyth from the Mullard Space Science Laboratory at UCL.

The magnetosphere is a large area around the Earth produced by the planet's magnetic field. It presence means that charged particles of the solar wind are unable to cross the magnetic field lines and are deflected around the Earth

The magnetosphere is a large area around the Earth produced by the planet’s magnetic field. It presence means that charged particles of the solar wind are unable to cross the magnetic field lines and are deflected around the Earth.

Space agencies are now taking the threat seriously. In November, three spacecraft were launched as part of the SWARM mission to uncover how the Earth’s magnetic field is changing.

The mission plans to provide better maps of our planet's magnetic field and help scientists understand the impact of space weather on satellite communication and GPS.

‘Whilst we have a basic understanding of the interior of the Earth, there is much we still don’t know,’ said Dr Forsyth.

‘We do not fully understand how the Earth’s magnetic field is generated, why it is variable and the timescales of these variations.’

The mission will provide a current map of Earth’s magnetic field. But historic evidence of its decline has already been found in a surprising source – ancient pottery.

Scientists have discovered that ancient pots can act as a magnetic time capsule. This is because they contain an iron-based mineral called magnetite. When pots form, the magnetite minerals align with the Earth’s magnetic field, just like compass needles.

WHAT IS GEOMAGNETIC REVERSAL?

The Earth’s magnetic field is in a permanent state of change. Magnetic north drifts around and every few hundred thousand years the polarity flips so a compass would point south instead of north. The strength of the magnetic field also constantly changes and currently it is showing signs of significant weakening.

The Earth magnetic field is mainly generated in the very hot molten core of the planet. The magnetic field is basically a dipole (it has a North and a South Pole). Magnetic reversal or flip is the process by which the North Pole is transformed into the South and vice versa, typically following a considerable reduction in the strength of the magnetic field. However, weakening of the magnetic field does not always result in a reversal.

During a reversal, scientists expect to see more complicated field pattern at the Earth's surface, with perhaps more than one North and South Pole at any given time. The overall strength of the field, anywhere on the Earth, may be no more than a tenth of its strength now.

The Earth's magnetic field is generated in the very hot molten core of the planet. Scientists believe Mars used to have a magnetic field similar to that on Earth which protected its atmosphere

By examining pottery from prehistory to modern times, scientists have discovered just how dramatically the field has changed in the last few centuries.

They’ve found that Earth’s magnetic field is in a permanent state of flux. Magnetic north drifts and every few hundred thousand years the polarity flips so a compass would point south instead of north.

If the magnetic field continues to decline, over billions of years, Earth could end up like Mars - a once oceanic world that has become a dry, barren planet incapable of supporting life.

WHAT ARE THE DANGERS OF A MAGNETIC FLIP?

Life has existed on the Earth for billions of years, during which there have been many reversals.

There is no obvious correlation between animal extinctions and those reversals. Likewise, reversal patterns do not have any correlation with human development and evolution.

It appears that some animals, such as whales and some birds use Earth's magnetic field for migration and direction finding.

Since geomagnetic reversal takes a number of thousands of years, they could well adapt to the changing magnetic environment or develop different methods of navigation.

Radiation at ground level would increase, however, with some estimates suggesting that overall exposure to cosmic radiation would double causing more deaths from cancer. ‘But only slightly,’ said Professor Richard Holme.

‘And much less than lying on the beach in Florida for a day. So if it happened, the protection method would probably be to wear a big floppy hat.’

Electric grid collapse from severe solar storms is a major risk. As the magnetic field continues to weaken, scientists are highlighting the importance off-the grid energy systems using renewable energy sources to protect the Earth against a black out.

'The very highly charged particles can have a deleterious effect on the satellites and astronauts,' added Dr Mona Kessel, a Magnetosphere discipline scientist at Nasa.

In one area, there is evidence that a flip is already occurring. ‘The increasing strength of the South Atlantic anomaly, an area of weak field over Brazil, is already a problem,’ said Professor Richard Holme.

The Earth's climate could also change. A recent Danish study has found that the earth's weather has been significantly affected by the planet's magnetic field.

They claimed that fluctuations in the number of cosmic rays hitting the atmosphere directly alter the amount of cloud covering the planet.

Henrik Svensmark, a weather scientist at the Danish National Space Centre who led the team behind the research, believes that the planet is experiencing a natural period of low cloud cover due to fewer cosmic rays entering the atmosphere.

But scientists claim the rate of decline is too fast for the Earth’s core to simply burn out. Instead, the story told by ancient pottery suggests the Earth's poles could be about to undergo another flip.

According to the British Geological Survey, the Earth's magnetic field has on average four or five reversals in polarity every million years and we’re now overdue a similar event.

‘At the moment, we cannot accurately determine whether or not the Earth’s field is about to flip,’ said Dr Forsyth. ‘We have only been recording the Earth’s field for around 170 years; about 1-15 per cent of the time a flip is expected to take.’

If a flip occurs, it would cause the Earth’s magnetic shield to be weakened for thousands of years, opening up our defences and causing cosmic radiation to get through.

'We have a double layer defence shield,' said Jim Wild a space scientists at Lancaster University.

'Space is full of stuff that’s not great for biological tissue. If we didn’t have an atmosphere, that stuff would be hitting us. It’s the magnetic field protects atmosphere from the solar wind.'

Mapping the Earth's magnetic field

‘Some speculative studies have suggested that as the Earth’s magnetic field weakens we could see an increase in cloud coverage in the troposphere and an increase in the polar ozone holes,’ added Dr Forsyth.

‘This would be particularly evident in the northern hemisphere where up to 40 per cent of the ozone within the hole region could be lost, far greater than the current losses.’

In fact, in one area, there is evidence that a flip is already occurring. ‘The increasing strength of the South Atlantic anomaly, an area of weak field over Brazil, is already a problem,’ said Professor Holme.

Mapping the magnetic field: Why it matters

Not all of the effects of a weak magnetic field will be bad. The much sought-after spectacle of an aurora would be visible every night all over the Earth as solar winds hit the atmosphere

‘Satellites flying over have far more problems than in other locations. Astrophysical satellite are just switched off in this location, but from my perspective, this isn’t much good if you want to study the Brazilian rainforest.’

'The very highly charged particles can have a deleterious effect on the satellites and astronauts,' added Dr Mona Kessel, a Magnetosphere discipline scientist at Nasa.

Scientists however, are quick to point out that while a magnetic flip could cause problems for mankind, the event won’t be a catastrophic.

‘We’ve had many reversals in the past, and haven’t been able to show that they had anything to do with, for example, mass extinctions,’ said Professor Holme.

And not all of the effects will be bad. The much sought-after spectacle of an aurora would be visible every night all over the Earth as solar winds hit the atmosphere.

There remains, however, much work yet to be done in understanding the properties of the deep Earth.

The Earth’s core is a hostile world where the crushing forces and temperatures, similar to that of the surface of the sun, take our scientific understanding and abilities to the limit.

'This isn't some crazy theory that might happen,' said Professor Wild. 'There is evidence, but we still need to do more science to understand the impact...I'm confident we can come up with a solution.'

WHAT IS THE SWARM MISSION?

Swarm is a ESA satellite mission which was launched on 22nd November 2013.

The mission consists of three identical satellites which will precisely measure the strength and direction of Earth's magnetic field. The new data will be processed by British Geological Survey to produce an accurate map of this field.

In order to best measure the field, the satellites will orbit in a unique configuration. Two satellites will fly side-by-side at height of 450 km, while the third satellite will fly at an altitude of 530 km.

The lower two satellites will allow very fine measurements of the magnetic field generated by the rocks in the Earth's crust, which are difficult to detect otherwise. The upper satellite will give a simultaneous measurement at a different location.

Tuesday, February 4, 2014

Millions of Poor Are Left Uncovered by U.S Health Law

Millions of Poor Are Left Uncovered by Health Law

James Patterson for The New York Times

Claretha Briscoe, left, of Hollandale, Miss., with family. She earns too much to qualify for Medicaid but not enough to get subsidies on the new health exchange.

By SABRINA TAVERNISE and ROBERT GEBELOFF

Because they live in states largely controlled by Republicans that have declined to participate in a vast expansion of Medicaid, the medical insurance program for the poor, they are among the eight million Americans who are impoverished, uninsured and ineligible for help. The federal government will pay for the expansion through 2016 and no less than 90 percent of costs in later years. A sweeping national effort to extend health coverage to millions of Americans will leave out two-thirds of the poor blacks and single mothers and more than half of the low-wage workers who do not have insurance, the very kinds of people that the program was intended to help, according to an analysis of census data by The New York Times.

Those excluded will be stranded without insurance, stuck between people with slightly higher incomes who will qualify for federal subsidies on the new health exchanges that went live this week, and those who are poor enough to qualify for Medicaid in its current form, which has income ceilings as low as $11 a day in some states.

People shopping for insurance on the health exchanges are already discovering this bitter twist.

“How can somebody in poverty not be eligible for subsidies?” an unemployed health care worker in Virginia asked through tears. The woman, who identified herself only as Robin L. because she does not want potential employers to know she is down on her luck, thought she had run into a computer problem when she went online Tuesday and learned she would not qualify.

At 55, she has high blood pressure, and she had been waiting for the law to take effect so she could get coverage. Before she lost her job and her house and had to move in with her brother in Virginia, she lived in Maryland, a state that is expanding Medicaid. “Would I go back there?” she asked. “It might involve me living in my car. I don’t know. I might consider it.”

The 26 states that have rejected the Medicaid expansion are home to about half of the country’s population, but about 68 percent of poor, uninsured blacks and single mothers. About 60 percent of the country’s uninsured working poor are in those states. Among those excluded are about 435,000 cashiers, 341,000 cooks and 253,000 nurses’ aides.

“The irony is that these states that are rejecting Medicaid expansion — many of them Southern — are the very places where the concentration of poverty and lack of health insurance are the most acute,” said Dr. H. Jack Geiger, a founder of the community health center model. “It is their populations that have the highest burden of illness and costs to the entire health care system.”

The disproportionate impact on poor blacks introduces the prickly issue of race into the already politically charged atmosphere around the health care law. Race was rarely, if ever, mentioned in the state-level debates about the Medicaid expansion. But the issue courses just below the surface, civil rights leaders say, pointing to the pattern of exclusion.

Every state in the Deep South, with the exception of Arkansas, has rejected the expansion. Opponents of the expansion say they are against it on exclusively economic grounds, and that the demographics of the South — with its large share of poor blacks — make it easy to say race is an issue when it is not.

In Mississippi, Republican leaders note that a large share of people in the state are on Medicaid already, and that, with an expansion, about a third of the state would have been insured through the program. Even supporters of the health law say that eventually covering 10 percent of that cost would have been onerous for a predominantly rural state with a modest tax base.

“Any additional cost in Medicaid is going to be too much,” said State Senator Chris McDaniel, a Republican, who opposes expansion.

The law was written to require all Americans to have health coverage. For lower and middle-income earners, there are subsidies on the new health exchanges to help them afford insurance. An expanded Medicaid program was intended to cover the poorest. In all, about 30 million uninsured Americans were to have become eligible for financial help.

But the Supreme Court’s ruling on the health care law last year, while upholding it, allowed states to choose whether to expand Medicaid. Those that opted not to leave about eight million uninsured people who live in poverty ($19,530 for a family of three) without any assistance at all.

Poor people excluded from the Medicaid expansion will not be subject to fines for lacking coverage. In all, about 14 million eligible Americans are uninsured and living in poverty, the Times analysis found.

The federal government provided the tally of how many states were not expanding Medicaid for the first time on Tuesday. It included states like New Hampshire, Ohio, Pennsylvania and Tennessee that might still decide to expand Medicaid before coverage takes effect in January. If those states go forward, the number would change, but the trends that emerged in the analysis would be similar.

Mississippi has the largest percentage of poor and uninsured people in the country — 13 percent. Willie Charles Carter, an unemployed 53-year-old whose most recent job was as a maintenance worker at a public school, has had problems with his leg since surgery last year.

His income is below Mississippi’s ceiling for Medicaid — which is about $3,000 a year — but he has no dependent children, so he does not qualify. And his income is too low to make him eligible for subsidies on the federal health exchange.

“You got to be almost dead before you can get Medicaid in Mississippi,” he said.

He does not know what he will do when the clinic where he goes for medical care, the Good Samaritan Health Center in Greenville, closes next month because of lack of funding.

“I’m scared all the time,” he said. “I just walk around here with faith in God to take care of me.”

The states that did not expand Medicaid have less generous safety nets: For adults with children, the median income limit for Medicaid is just under half of the federal poverty level — or about $5,600 a year for an individual — while in states that are expanding, it is above the poverty line, or about $12,200, according to the Kaiser Family Foundation.There is little or no coverage of childless adults in the states not expanding, Kaiser said.

The New York Times analysis excluded immigrants in the country illegally and those foreign-born residents who would not be eligible for benefits under Medicaid expansion. It included people who are uninsured even though they qualify for Medicaid in its current form.

Blacks are disproportionately affected, largely because more of them are poor and living in Southern states. In all, 6 out of 10 blacks live in the states not expanding Medicaid. In Mississippi, 56 percent of all poor and uninsured adults are black, though they account for just 38 percent of the population.

Dr. Aaron Shirley, a physician who has worked for better health care for blacks in Mississippi, said that the history of segregation and violence against blacks still informs the way people see one another, particularly in the South, making some whites reluctant to support programs that they believe benefit blacks.

That is compounded by the country’s rapidly changing demographics, Dr. Geiger said, in which minorities will eventually become a majority, a pattern that has produced a profound cultural unease, particularly when it has collided with economic insecurity.

Dr. Shirley said: “If you look at the history of Mississippi, politicians have used race to oppose minimum wage, Head Start, all these social programs. It’s a tactic that appeals to people who would rather suffer themselves than see a black person benefit.”

Opponents of the expansion bristled at the suggestion that race had anything to do with their position. State Senator Giles Ward of Mississippi, a Republican, called the idea that race was a factor “preposterous,” and said that with the demographics of the South — large shares of poor people and, in particular, poor blacks — “you can argue pretty much any way you want.”

The decision not to expand Medicaid will also hit the working poor. Claretha Briscoe earns just under $11,000 a year making fried chicken and other fast food at a convenience store in Hollandale, Miss., too much to qualify for Medicaid but not enough to get subsidies on the new health exchange. She had a heart attack in 2002 that a local hospital treated as part of its charity care program.

“I skip months on my blood pressure pills,” said Ms. Briscoe, 48, who visited the Good Samaritan Health Center last week because she was having chest pains. “I buy them when I can afford them.”

About half of poor and uninsured Hispanics live in states that are expanding Medicaid. But Texas, which has a large Hispanic population, rejected the expansion. Gladys Arbila, a housekeeper in Houston who earns $17,000 a year and supports two children, is under the poverty line and therefore not eligible for new subsidies. But she makes too much to qualify for Medicaid under the state’s rules. She recently spent 36 hours waiting in the emergency room for a searing pain in her back.

“We came to this country, and we are legal and we work really hard,” said Ms. Arbila, 45, who immigrated to the United States 12 years ago, and whose son is a soldier in Afghanistan. “Why we don’t have the same opportunities as the others?”

Courtesy:
http://www.nytimes.com/2013/10/03/health/millions-of-poor-are-left-uncovered-by-health-law.html?pagewanted=all&_r=1&

Human Being

Wednesday, February 5, 2014