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
June 1,2020

New Delhi, Jun 1: Actor Kendrick Sampson, who stars in HBO series Insecure, was struck by rubber bullets as Los Angeles police officers tried to disperse a crowd protesting George Floyd”s death in Minneapolis.

Floyd, a black man, died last Monday in Minneapolis, Minnesota after a white police officer pressed his knee on his neck for more than eight minutes. The officer was arrested on Friday and charged with third-degree murder.

The actor went live via Instagram on Saturday to show his view of events, but he could be also be seen on a CNN broadcast simultaneously, with viewers watching him get hit by a police baton on TV.

Sampson posted several videos on his page of a large demonstration at Pan Pacific Park near the city”s Fairfax District, where violent clashes took place throughout the day outside the Grove shopping center.

In one video, LAPD officers can be seen firing rubber bullets to try and regain control at the park.

“They shot me four times already. I already got hurt and I got hit with a baton,” Sampson said in the video on Instagram.

Another clip showed him moving away from the police, as he appeared to be hit by an officer”s baton.

“Y”all ain”t see no police f*****g up white folks when they took guns to the statehouse,” he said, referring to an incident in Michigan over coronavirus restrictions, not in California. “Y”all didn”t see police attacking white folks, beating em up with batons, shooting them with rubber bullets when they brought guns to f*****g state houses. We came up here with no weapons, with masks.… And we”re the ones who are not peaceful,” Sampson alleged.

Protests turned violent over Floyd”s death and other police killings of black people spread Saturday in dozens of US cities, with police cars set ablaze, reports of injuries mounting on all sides, shops and showrooms vandalised amid the lockdown.

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Agencies
March 26,2020

Washington, Mar 26: Indian-American hoteliers have come forward to rescue the stranded Indian students in the US following implementation of lockdown measures in the country in response to the rapidly-spreading coronavirus pandemic, offering them free accommodation and free meals.

With the students scrambling for a roof over their heads after being asked to vacate their hostels and India banning international flights for a week from March 22 due to the coronavirus pandemic, more than 6,000 rooms in nearly 700 hotels were offered to them by Wednesday following a call from the Indian Embassy.

The Indian Embassy have been running a round-the-clock helpline since last week for the students in the US, who number over 2,50,000.

Most of these hotels offered are in and around universities and colleges, but the hotel owners from across the country have come up in large numbers to the call given by community leaders, who have roped in Asian American Hotel Owners Association (AAHOA) for the purpose.

India's Ambassador to the US Taranjit Singh Sandhu said in a tweet, "It is heartening to see that Indian; Indian-American and other hotel owners are coming forward to help people with accommodation in these testing times. Together we can overcome the fight against COVID19!"

"The Indian community has come together to help the student and many hotel owners have offered their rooms free of cost to them. Many of them are also offering free meals to these students," Chicago-based community leader Nirav Patel told PTI.

Indian-American hotelier couple K K Mehta and Chandra Mehta have offered more than 100 rooms to Indian students at their two prime properties each near the Times Square and Barclays Center in New York City, said Jaipur Foot USA chairman Prem Bhandari on behalf of the hotels.

The Indian Consulate in New York had contacted them about this 10 days ago, he said.

"These students are the future of both India and the United States. All the top Indian-American CEOs, scientists and doctors came to this country as a student. It's our moral duty to help them with our resources," Bhandari said.

Regional director of AAHOA Upper Midwest Kalpesh Joshi said they had created a master list of the availability hotel rooms, which was being constantly updated.

Free accommodation would be allocated in coordination with the Indian Embassy and its consulates, he said.

"The Indian Embassy and its consulates are working tirelessly to get these students rooms," he added.

Joshi has also sent out a video message to his hotelier colleagues: "Because of the coronavirus outbreak, our Indian students in the US are out of shelter. Let's work together. As a hotelier, I would like to request all my hotelier friends to come forward... let's provide some rooms to the students."

Boston-based Computer Society of India (North America) has collaborated with AAHOA to help students and Indian IT professionals searching for emergency accommodation due to the COVID-19 lockdown.

Anyone who is having financial hardship will be given hotel accommodation either free of cost or the rates will not be more than USD 50, said the Computer Society of India (North America).

Minesh Patel, the chairman of Virginia Asian American Store Association, said between Richmond, Norfolk, and Virginia Beach, Indian-American hotel owners can help in arranging accommodation for over 500 Indian students.

Florida-based Vipul Patel, the national president of Asian American Store Owners Association, said support for the Indian students have been pouring in from the Indian-American hoteliers.

"I have not come across any hotel owner who said no to us," Patel said.

Rooms would be allocated to students on the recommendation of the Indian Embassy and its consulates in Houston, Chicago, Atlanta, San Francisco and New York.

The Indian Consulate in New York was the first to take a lead in this regard. It has worked with Hammock Worldwide Hotels and Resorts to provide temporary accommodation for the students at a flat rate of USD 50 per night.

Joshi said that initially there was a suggestion to charge a convenience fee of USD 20-25 per day from the students.

"But when a few of them offered free rooms and free meals, everyone agreed to it," he said.

According to Johns Hopkins University coronavirus tracker, the number of deaths caused by the novel coronavirus in the US rose to 1,031 with 68,572 confirmed cases. The US has the third highest number of confirmed cases behind China and Italy.

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News Network
June 1,2020

Washington, Jun 1: Police fired tear gas outside the White House late Sunday as major US cities were put under curfew to suppress rioting as anti-racism protestors again took to the streets to voice fury at police brutality.

With the Trump administration branding instigators of six nights of rioting as domestic terrorists, there were more confrontations between protestors and police and fresh outbreaks of looting.

Violent clashes erupted repeatedly in a small park next to the White House, with authorities using tear gas, pepper spray and flash bang grenades to disperse crowds who lit several large fires and damaged property.

Local US leaders appealed to citizens to give constructive outlet to their rage over the death of an unarmed black man in Minneapolis, while night-time curfews were imposed in cities including Washington, Los Angeles and Houston.

One closely watched protest was outside the state capitol in Minneapolis' twin city of St. Paul, where several thousand people gathered before marching down a highway.

"We have black sons, black brothers, black friends, we don't want them to die. We are tired of this happening, this generation is not having it, we are tired of oppression," said Muna Abdi, a 31-year-old black woman who joined the protest.

"I want to make sure he stays alive," she added in reference to her son, aged three.

Hundreds of police and National Guard troops were deployed ahead of the protest.

At one point, some of the protestors who had reached a bridge were forced to scramble for cover when a truck drove at speed after having apparently breached a barricade.

The driver was later taken to hospital after the protestors hauled him from the vehicle, although there were no immediate reports of other casualties.

There were other large-scale protests in cities including New York and Miami.

Washington's mayor ordered a curfew from 11:00 pm until 6:00 am, as a report in the New York Times said that President Donald Trump had been rushed by Secret Service agents into an underground bunker at the White House on Friday night during an earlier protest.

Stores ransacked

Large-scale violence has rocked many US cities in recent days, and looters ransacked stores in a neighborhood of Philadelphia on Sunday.

In the Los Angeles suburb of Santa Monica, looting was reported at stores in a popular beachside shopping center.

Officials in LA -- a city scarred by the 1992 riots over the police beating of Rodney King, an African-American man -- imposed a curfew from 4:00 pm Sunday until dawn.

"Please, use your discretion and go early, go home, stay home and help us make sure that those who want to change this conversation from being about racial justice to be about burning things and looting things, don't win the day," the city's mayor Eric Garcetti said on CNN.

The shocking videotaped death last Monday of an unarmed black man, George Floyd, at the hands of police in Minneapolis ignited the nationwide wave of outrage over law enforcement's repeated use of lethal force against unarmed African Americans.

Floyd stopped breathing after Minneapolis police officer Derek Chauvin knelt on his neck for nearly nine minutes.

Chauvin has been charged with third-degree murder and is due to make his first appearance in court on Monday. Three other officers with him have been fired but for now face no charges.

Governor Tim Walz has mobilized all of Minnesota's National Guard troops  -- the state guard's biggest mobilization ever -- to help restore order.

Police fired tear gas and stun grenades to clear streets of curfew violators Saturday night in Minneapolis.

Walz extended a curfew for a third night Sunday and praised police and guardsmen for holding down violence. "They did so in a professional manner. They did so without a single loss of life and minimal property damage," he said.

"Congratulations to our National Guard for the great job they did immediately upon arriving in Minneapolis, Minnesota, last night," President Donald Trump tweeted, adding that they "should be used in other States before it is too late!"

The Department of Defense said that around 5,000 National Guard troops had been mobilized in 15 states as well as the capital Washington, with another 2,000 on standby.

The widespread resort to uniformed National Guards units is rare, and it evoked disturbing memories of the rioting in US cities in 1967 and 1968 in a turbulent time of protest over racial and economic disparities.

Trump blamed the extreme left for the violence, saying he planned to designate a group known as Antifa as a terrorist organization.

"The violence instigated and carried out by Antifa and other similar groups in connection with the rioting is domestic terrorism and will be treated accordingly," added Attorney General Bill Barr.

'A nation in pain'

Atlanta Mayor Keisha Lance Bottoms said Trump, who has often urged police to use tough tactics, was not helping matters.

"We are beyond a tipping point in this country, and his rhetoric only enflames that," she said on CBS.

Joe Biden, Trump's likely Democratic opponent in November's presidential election, visited the scene of one anti-racism protest.

"We are a nation in pain right now, but we must not allow this pain to destroy us," Biden tweeted, posting a picture of him speaking with an African-American family at the site where protesters had gathered in Delaware late Saturday.

Floyd's death has triggered protests beyond the United States, with hundreds rallying outside the US embassy in London in solidarity.

"I'm here because I'm tired, I'm fed up with it. When does this stop?" Doreen Pierre told AFP at the protest.

In Germany, England football international Jadon Sancho marked one of his three goals for Borussia Dortmund against Paderborn by lifting his jersey to reveal a T-shirt bearing the words "Justice for George Floyd".

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