NASA probe beams back ultraviolet images of Martian atmosphere

October 18, 2016

Washington, Oct 18: In a first, NASA's MAVEN spacecraft has beamed back ultraviolet images of Mars that unveils dynamic, previously invisible activities in the atmosphere of the red planet such as change in ozone levels over the seasons and formation of clouds.master

The images were taken by the Imaging UltraViolet Spectrograph (IUVS) on the Mars Atmosphere and Volatile Evolution mission (MAVEN) - a space probe designed to study the Martian atmosphere while orbiting Mars.

These were then used to make this movie of rapid cloud formation on Mars on July this year.

The movie uses four MAVEN images to show about seven hours of Mars rotation during this period, and interleaves simulated views that would be seen between the four images.

"MAVEN obtained hundreds of such images in recent months, giving some of the best high-resolution ultraviolet coverage of Mars ever obtained," said Nick Schneider from the University of Colorado, Boulder in the US.

Nightside images show ultraviolet (UV) "nightglow" emission from nitric oxide (NO). Nightglow is a common planetary phenomenon in which the sky faintly glows in the complete absence of external light.

Mars' nightside atmosphere emits light in the ultraviolet due to chemical reactions that start on Mars' dayside.

Ultraviolet light from the Sun breaks down molecules of carbon dioxide and nitrogen, and the resulting atoms are carried around the planet by high-altitude wind patterns that encircle the planet.

On the nightside, these winds bring the atoms down to lower altitudes where nitrogen and oxygen atoms collide to form nitric oxide molecules. The recombination releases extra energy, which comes out as ultraviolet light.

Scientists predicted NO nightglow at Mars, and prior missions detected its presence, but MAVEN has returned the first images of this phenomenon in the Martian atmosphere.

Splotches and streaks appearing in the images occur where NO recombination is enhanced by winds.

Such concentrations are clear evidence of strong irregularities in Mars' high altitude winds and circulation patterns. These winds control how Mars' atmosphere responds to its very strong seasonal cycles.

Dayside images show the atmosphere and surface near Mars' south pole in unprecedented ultraviolet detail. They were obtained as spring comes to the southern hemisphere.

Ozone is destroyed when water vapour is present, so ozone accumulates in the winter polar region where the water vapour has frozen out of the atmosphere.

The images show ozone lasting into spring, indicating that global winds are inhibiting the spread of water vapour from the rest of the planet into winter polar regions.

MAVEN observations also show afternoon cloud formation over the four giant volcanoes on Mars.
Clouds are a key to understanding a planet's energy balance and water vapour inventory, so these observations will be valuable in understanding the daily and seasonal behaviour of the atmosphere, researchers said.

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News Network
May 20,2020

Washington, May 20: Once dubbed as historic by him, US President Donald Trump on Tuesday said he now feels ‘differently’ about the trade deal he signed with China earlier this year.

He said this while once again venting out his frustration with the Beijing leadership, accusing it of letting coronavirus spread.

Till Tuesday, over 92,000 Americans have died and 1.5 million tested positive for coronavirus that has globally killed around 320,000 people.

The US and China had signed a deal in January to end their 22-month-long trade war during which the two countries slapped tit-for-tat tariff hikes on products worth nearly half a trillion USD.

Under it, Beijing agreed to increase its purchase of US goods by USD 200 billion in 2020-2021.

“I feel differently now about that deal than I did three months ago,” Trump told reporters during a Cabinet meeting at the White House.

“We will see what all happens, but it's been a very disappointing situation. A very disappointing thing happened with China because the plague flowed in and that wasn't supposed to happen and it could have been stopped," he said.

Trump said he was very excited when the trade deal with China was signed.

“But once the virus came in, once the plague, as I called it, came in, I said how did they let that happen? And how come it didn't go into other sections of China? Why did they block it from leaving Wuhan? But they didn't block it from going to the rest of the world, including the United States. Why is that? Beijing doesn't have it. Other places don't have it,” he said.

Trump did not respond to questions on retaliation against China.

Meanwhile, top American senators continued to press the administration that rules of engagement with China needs to change post-coronavirus.

“As we know, they unleashed this virus on America and the world with their classic communist cover-up, deception, continued propaganda campaign, costing now over 90,000 American lives, 35 million Americans losing their jobs so far,” Senator Martha McSally said during a Congressional hearing.

“We don’t know who patient zero is, they destroyed samples, they silenced doctors, they kicked out journalists, they impacted international travel to seed this and their reckless behaviour continues to be the root of all this,” she said.

As a result of coronavirus, the American economy has been thrown into recession; more than 36 million people have lost their job – the worst ever after last century’s great depression.

Many of the US states have now started opening up, after taking necessary precautions.

By conservative estimates, it will take several quarters for the economy to be back on track.

Trump in the last a few weeks has exuded confidence that the economy will be back on track next year.

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News Network
February 14,2020

London, Feb 14: Five years ago Britain’s new finance minister Rishi Sunak wasn’t even a member of parliament and now he is running the world's fifth largest economy.

The 39-year-old former Goldman Sachs banker was appointed in dramatic fashion on Thursday when incumbent Sajid Javid unexpectedly quit — in a row over advisers — during what Downing Street had cast as a routine ministerial reshuffle.

Sunak is married to the daughter of Infosys co-founder NR Narayana Murthy, and was hand-picked to take over an ultra-safe seat in northern England, previously represented by former Conservative Party leader William Hague. The Murthy family was not reachable for comment.

In July, when he was promoted chief secretary to the Treasury, Murthy had said: “Our advice to our children, including Rishi, has been to work hard, be honest, and do good for society…We wish him well.”

After Thursday’s announcement, Sunak said: “Delighted to be appointed... Lots to get on with.”

Tipped for Promotion

As Boris Johnson moves to increase control of the finance ministry, one of the youngest chancellors in history will face a prime minister who wants to increase government spending on everything from infrastructure and police to health and education.

Sunak, seen as a rising star in the ruling Conservative Party since he entered Parliament in 2015, had been tipped for promotion to a senior post in the ministerial rejig as Johnson put together his post-Brexit cabinet.

But, despite an already rapid ascent through the ranks of government, few expected the Oxford University Politics, Philosophy and Economics graduate to ascend to one of the highest offices in the land.

Sunak had been serving as Javid’s deputy in the finance ministry since Johnson promoted him upon taking office in July 2019. Prior to that he had served as a junior housing minister.

“From working in my mum’s tiny chemist shop to my experience building large businesses, I have seen first-hand how politicians should support free enterprise and innovation to ensure our future prosperity,” Sunak says on his website.

Smooth and loyal

Seen as a smooth media performer and ultra-loyal member of the Conservative Party, Sunak has been used by the government to present and defend their policies in television interviews — a sign of trust from Johnson, who has a fraught relationship with Britain’s media.

Sunak takes control at a critical juncture for Britain’s $2.7 trillion economy. He will have to steer the economy through the turbulence of leaving the European Union and the forging of new trade links that will define Britain’s new relationship with the world.

However, the power struggle that forced his predecessor Javid to quit hints at a more diminished role for what is the second most powerful position in the government — with Johnson’s office wanting to centralise control and minimise dissent.

Sunak is one of the three ministers of Indian origin in Johnson’s cabinet, the other two being Priti Patel and Alok Sharma. Patel remains the interior minister after the cabinet reshuffle while Sharma, a former minister for international development, was appointed the new minister for business. Sunak’s father was a doctor and his mother ran a chemist shop. Before entering politics he worked for Goldman Sachs and a hedge fund, then co-founded an investment firm. He also has an MBA from Stanford University.

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News Network
April 30,2020

Los Angeles, Apr 30: Los Angeles will begin offering coronavirus">coronavirus testing for free to all citizens regardless of whether they have symptoms, Mayor Eric Garcetti said on Wednesday, adding that LA is the first major US city to take such an initiative.

During the press conference, Garcetti announced that all county residents can now get free coronavirus">coronavirus testing. 

He said the announcement will only apply to city residents for now, but that a similar plan is in development for Los Angeles County,
Garcetti also took to Twitter to announce the same. "Announcing that L.A. is now the first major city in America to offer free COVID-19 testing to all residents. 

While priority will still be given to those with symptoms, individuals without symptoms can also be tested. Sign up at Coronavirus.LACity.org/Testing," he said
Under the new guidelines, priority for the same- or next-day testing will still be given to people with symptoms, such as a fever, cough, and shortness of breath. The free testing will also be prioritized for certain critical frontline workers who interact with the public.

Until now, only residents with symptoms as well as essential workers and those in institutional settings like nursing homes could be tested.

On Wednesday, the LA County reported 1,541 new cases, bringing the total to 22,485 - a seven per cent increase since yesterday.

This includes a backlog of cases that were processed. In the city, there were 683 new cases on Wednesday, bringing the total to 10,380 -- a 7 percent increase since yesterday.

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