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
April 28,2020

Geneva, Apr 28: The global death toll from the novel coronavirus has increased over the past 24 hours by nearly 5,000 to top 198,000, the World Health Organisation (WHO) said.

According to the latest WHO data, 85,530 new cases of infection have been registered globally over the past day, with 4,982 deaths.

The overall number of COVID-19 cases worldwide increased to 2,878,196 and the death count reached 198,668.

There are 1,359,380 confirmed cases and 124,525 deaths in Europe.

The number of cases in the Americas total 1,140,520, with 58,492 deaths.

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News Network
July 1,2020

As Peru begins to ease its strict coronavirus lockdown, the country's biggest LGBTQ nightclub opened its doors on Tuesday, but there will be no nighttime revellers; its dance floor will instead be filled with shelves stocked with groceries.

Instead of slinging cocktails at the bar or dancing on stage, ValeTodo Downtown's famed staff of drag queens will sell customers daily household products as the space reopens as a market while nightclubs are ordered to remain closed.

The Peruvian government will lift the lockdown in most regions of the country at the beginning of July but will keep borders closed, as well as nightclubs and bars.

The lockdown has been a struggle for the club's 120 employees like drag queen Belaluh McQueen. Her life completely changed when the government announced the quarantine. Her nights were spent at home, rather than performing as a dancer at the club in vivid-coloured costumes.

"I was very depressed because I have been doing this art for years, but you have to adapt to new challenges for the future," said McQueen, who is identified by her stage name.

Now McQueen is back to work as a grocery store employee, wearing a sequined suit, high heels and a mask. A DJ will play club music as patrons shop. "We have a new job opportunity," McQueen added.

Renamed as Downtown Market, the club, which has been a mainstay hallmark of the local LGBTQ community, ushered in its reopening with an inauguration ceremony.

"Before, I used to come here to dance and have a good time, but now we come to buy," said Alexandra Herrera, a regular attendee of the club. "The thing is to reinvent yourself."

The club's general manager, Claudia Achuy, said that the pandemic impacted the heart of Lima nightlife, but she chose to reopen as a market rather than risk cutting staff. "If we had just stayed as a nightclub we did not have a close horizon or a way of working," Achuy said.

Peru's confirmed coronavirus cases rose to 282,364 with 9,504 associated deaths on Monday, according to government data. It has the second-highest outbreak in Latin America after Brazil, according to a Reuters tally.

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News Network
March 13,2020

Mar 13: Canadian Prime Minister Justin Trudeau and his wife announced they were self-isolating Thursday as she undergoes tests for the new coronavirus after returning from a speaking engagement with "mild flu-like symptoms."

Sophie Gregoire-Trudeau's symptoms have subsided since she recently got back from Britain, but as a precaution the prime minister "will spend the day in briefings, phone calls and virtual meetings from home," according to a statement.

Trudeau also cancelled a meeting Thursday and Friday with Canada's provincial and territorial leaders in Ottawa, but still planned to speak with them and world leaders by phone about measures being taken to curb the spread of the virus in Canada.

Gregoire-Trudeau's symptoms had included "a low fever late last night." She immediately sought medical advice and testing.

Trudeau has exhibited no symptoms, and was advised by doctors "to continue daily activities while self-monitoring."

"However, out of an abundance of caution, the prime minister is opting to self-isolate and work from home until receiving Sophie's results," said his office.

Since the novel coronavirus first emerged in late December 2019, 127,070 cases have been recorded in 115 countries and territories, killing 4,687 people, according to an AFP tally compiled at 1200 GMT on Thursday based on official sources.

Canada has so far reported more than 100 cases in six provinces, and one death.

Also Thursday, the Canada's Juno music awards cancelled its upcoming gala show, planned for Sunday evening in Saskatoon, Saskatchewan.

"We are devastated to cancel this national celebration of music, but at this time of global uncertainty, the health, safety and well-being of all Canadians must stand at the forefront of any decisions that impact our communities," organisers said in a statement.

And in Quebec province, Premier Francois Legault unveiled a series of measures to prevent the spread of the coronavirus, including placing all travellers returning from overseas under quarantine for two weeks.

Quebec also banned indoor gatherings of more than 250 people.

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