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.

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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
April 14,2024

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New Delhi: A 24-year-old student from India was shot dead inside a car in Canada's South Vancouver, the local police have said. The Vancouver Police in a statement said Chirag Antil, 24, was found dead inside a vehicle in the area after neighbours reported hearing gunshots.

"Officers were called to East 55th Avenue and Main Street around 11 pm on April 12 after residents heard the sound of gunshots. Chirag Antil, 24, was found deceased inside a vehicle in the area. No arrests have been made, and the investigation remains ongoing," the police said.

Chirag Antil's brother Ronit told reporters that Chirag seemed happy when they spoke on the phone in morning. Chirag later took out his Audi to go somewhere. That was when he was shot dead.

The Congress students' wing National Students' Union of India chief Varun Choudhary in a post on X tagging the Ministry of External Affairs requested for assistance to the student's family.

"Urgent attention regarding the murder of Chirag Antil, an Indian student in Vancouver, Canada. We urge the Ministry of External Affairs to closely monitor the progress of the investigation and ensure that justice is swiftly served," Mr Choudhary said.

"Additionally, we request the ministry to extend all necessary support and assistance to the family of the deceased during this difficult time," he said.

Chirag Antil's family is raising money through the crowdfunding platform GoFundMe to repatriate his body to India, local media reported.

Haryana resident Romit Antil, the brother of Chirag Antil, told CityNews that he was a kind-hearted person.

"My brother and I had a great relationship. We used to talk every day, day and night. I spoke to him last before the accident happened. He was kind of happy, he never had any issues or fights with anyone, ever. He was an extremely polite person," Romit Antil told CityNews.

Chirag Antil came to Vancouver in September 2022. He just finished MBA at University Canada West, and recently got his work permit.

Here are 5 facts about Chirag Antil

1.    Chirag Antil was a resident of Sonipat, Haryana.
2.    He was the youngest son of Mahavir Antil, a retired employee of the Sugar Mill Department of the Haryana Government.
3.    Chirag moved to Vancouver in 2022 to pursue higher studies at the University Canada West (UCW), in British Columbia.
4.    After completing his MBA, he started working at a company in Canada after getting a work permit.
5.    Chirag's brother Ronit shared in an interview that his younger sibling was a "kind-hearted" person. "I spoke to him last before the accident happened," he said and added that Chirag sounded "happy".

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News Network
April 24,2024

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Pro-Gaza US protesters in New York's Columbia University say they will stay put despite the university's harassment and police crackdown.

The protesters said they refuse to concede to "cowardly threats and blatant intimidation" by university administration, asserting that they will continue to peacefully protest.

Columbia University threatened the students with the national guard after refusing to bargain in good faith.

The university announced a midnight deadline for talks regarding the removal of pro-Palestine encampments on the varsity campus, warning that their campsite will be forcefully cleared by police if no agreement is reached.

The university campus is being used as a campsite for hundreds of pro-Palestine protesters and other activists, who have gathered and set up numerous tents.

Pro-Palestinian protests at colleges have demanded that their universities divest from corporations doing business with Israel or profiting off the war in Gaza. At Columbia, protesters have also asked the university to end a dual-degree program with Tel Aviv University.

The deadline was announced by Columbia University President Minouche Shafik late Tuesday, as authorities across major American universities have launched their repression campaigns against the pro-Palestinian protests on campuses, amid rising anger over US's support for Israel. 

Shafik has issued a midnight deadline to protesters and organizers, warning that failure to comply will result in the forcible clearance of the camp by the New York Police Department (NYPD).

The university has engaged in discussions with student leaders behind the protests, which are part of a series of protests taking place at various colleges nationwide and resulting in multiple arrests.

The purpose of these talks is to address the encampment on the west lawn of Columbia's Morningside Heights campus.

American universities are grappling with the challenge of maintaining a delicate balance between the right to protest and freedom of speech, while also ensuring campus rules and safety, as tensions surrounding the ongoing war in Gaza continue to permeate across campuses.

Meanwhile, Shafik underscored the importance of free speech and the right to demonstrate, but highlighted significant safety issues, disruptions to campus activities, and a strained environment due to the encampment. She firmly stated that any form of intimidation, harassment, or discrimination would not be accepted.

The arrest of more than 100 protesters at Columbia University last week led to more campus demonstrations, at New York University, Yale, and the University of California, Berkeley.

Palestinian university professor Sami al-Arian said what is happening across US university campuses is unprecedented.

Al-Arian said, "I lived four decades in the US, 28 years of which were in academic settings. During my time, it was a very challenging struggle to present an anti-Zionist narrative."

"But the passion, courage, humanity, creativity, and determination displayed these days by students across US campuses make me proud. The Zionist grip on US society is weakening and waning."

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