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.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
Agencies
January 4,2020

Stockholm, Jan 4: “I’m not the kind of person who celebrates birthdays,” Greta Thunberg said as she turned 17 on Friday, marking the occasion in inimitable style - with a seven-hour hour protest outside the Swedish parliament.

The climate activist braved winter conditions in her native Stockholm to continue the weekly Friday School Strike for the Climate campaign that helped catapult her to international fame.

“I stand here striking from 8am until 3pm as usual ... then I’ll go home,” Thunberg, Time magazine’s Person of the Year for 2019, told Reuters.

“I won’t have a birthday cake but we’ll have a dinner.”

It’s been a busy 12 months for Thunberg, who crisscrossed the globe by car, train and boat - but not plane - to demand action on climate change.

“It has been a strange and busy year, but also a great one because I have found something I want to do with my life and what I am doing is having an impact,” she said.

When she was 15, Thunberg began skipping school on Fridays to demonstrate outside the Swedish parliament to push her government to curb carbon emissions. Her campaign gave rise to a grassroots movement that has gone global, inspiring millions of people to take action.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
Agencies
March 31,2020

Months after the outbreak of COVID-19 in Wuhan city of central China, families of those deceased, who contracted the contagious infection, stood in long queues at funeral homes demanding to receive the cremated ashes of their loved ones.

Now this has spurred questions about the actual tally of COVID-19 related casualties in Wuhan, in a renewed pressure on the Chinese government that is already struggling to control its containment narrative of the pandemic spread.

Chinese media outlet Caixin showed how trucks carrying 2,500 urns with the ashes of the deceased COVID-19 cases were being shipped in a funeral home last week. Another picture published revealed how 3,500 urns were stacked within these funeral homes. It is therefore unclear how many urns have been filled in.

According to media reports, workers at several funeral parlors declined to provide any details as to how many urns were waiting to be collected, saying they either did not know or were not authorised to share the number.

Some families said they had been forced to wait for several hours to pick up the ashes. The photos circulated as mass deaths from the virus spiked in cities across the west, including Milan, Madrid and New York, where hospitals were erecting tents to handle the overflow as global infections soar past 500,000, with 24,000 dead.

According to Chinese government figures, 2,535 people in Wuhan have died of the virus. The announcement that a lockdown in place since January would be lifted came after the country said its tally of new cases had hit zero and stepped up diplomatic outreach to other countries hard hit by the virus, sending some of them medical supplies.

But some in China have been skeptical of the accuracy of the official tally, particularly given Wuhan's overwhelmed medical system, authorities' attempts to cover up the outbreak in its initial stages, and multiple revisions to the way official cases are counted.

Residents on social media have demanded disciplinary action against top Wuhan officials.

Many people who died had Covid-19 symptoms, but weren't tested and excluded from the official case tally, Caixin said. There were also patients who died of other diseases due to a lack of proper treatment when hospitals were overwhelmed dealing with those who had the coronavirus.

There were 56,007 cremations in Wuhan in the fourth quarter of 2019, according to data from the city's civil affairs agency. The number of cremations was 1,583 higher than those in the fourth quarter of 2018 and 2,231 higher than the fourth quarter of 2017.

Two locals in Wuhan who have lost family members to the virus said online that they were informed they had to be accompanied by their employers or officials from neighborhood committees when picking up the urns, likely as a measure against public gatherings.

COVID-19 is affecting 199 countries and territories around the world. Over 664,000 coronavirus cases have been registered globally out of which 30,890 have succumbed to the infection.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
Agencies
July 2,2020

Ramallah, Jul 2: Several world countries renew a call for Israel to halt contentious plans to annex parts of the occupied Palestinian territory after the regime delayed the implementation of the land garb bid in the face of a series of stumbling blocks, including internal rifts, global criticisms and the US’s failure to give Tel Aviv the go-ahead for the move.

Israel's ruling coalition, led by Prime Minister Benjamin Netanyahu, had announced July 1 as the date to begin moving forward with the plan to impose Tel Aviv’s “sovereignty” over about a third of the West Bank, including settlements and the fertile Jordan Valley.

Without clarifications, the regime, however, failed to launch the scheme on the set date amid widening differences between Netanyahu and his coalition partner, minister of military affairs Benny Gantz.

Meanwhile, there are signs that the administration of US President Donald Trump, a staunch Israel supporter, has cooled its backing for the Israeli move amid what is believed to be troubles at home and fears that it might hurt the president’s chances of re-election besides international pressure.

On Wednesday, Netanyahu's office said in a statement that he would continue to discuss a possible West bank annexation with the US administration.

“In the coming days there will be additional discussions,” the statement said.

Labor, Social Affairs and Social Services Minister Ofir Akunis said the Israel would annex portions of the West Bank in July but only after the US president issued a declaration on the matter.

The annexation “will only happen after a declaration by Trump,” he told Israeli Army Radio.

Trump had already given Tel Aviv the green light for the land grab in his self-proclaimed “deal of the century,” which was unveiled in January with the aim of re-drawing the Middle East map.

However, the Trump administration has so far refrained from offering official support for the annexation sought by Netanyahu and his right-wing allies.

Unlike the US, several countries, including some of Israel’s allies, have expressed their opposition to Israel’s planned push to consolidate its occupation of Palestine.

Germany passes anti-annexation resolution

On Wednesday, the German parliament approved a resolution calling on the government to dissuade Israel from annexing the West Bank.

The motion, which was brought in the German legislature by the three parties in Chancellor Angela Merkel's coalition, was approved without opposing votes. 

Berlin should use its “special relations and contacts [with Tel Aviv] to express to the Israeli government our concerns and our urgent demand to refrain from an annexation of parts of the West Bank and from the continued expansion of settlements, both of which contradict international law,” read the resolution.

Speaking at the parliamentary debate before the vote, German Foreign Minister Heiko Maas said, “We reject unilateral changes of borders, and we won’t recognize them.”

He also stressed that peace “cannot be achieved through unilateral steps but only through serious negotiations.”

France warns of consequences

Similarly, French Foreign Minister, Jean-Yves Le Drian warned that any Israeli annexation would be a violation of international law and would bring about consequences.

“Annexation of Palestinian territories, whatever the perimeters, would seriously throw into question the parameters to resolve the conflict,” he told a parliamentary hearing. 

The top diplomat added, “An annexation decision could not be left without consequences and we are examining different options at a national level and also in coordination with our main European partners.”

Australia raises concerns

Additionally, Australian Foreign Minister Marise Payne voiced worries about the Israeli scheme, saying she had directly expressed this view to Israeli Foreign Minister Gabi Ashkenazi.

“We are following with concern possible moves towards the unilateral annexation or change in status of territory on the West Bank,” she said in a statement.

“The focus needs to be on a return to direct and genuine negotiations between Israel and the Palestinians for a durable and resilient peace arrangement, as soon as possible,” Payne added.

Vatican summons US, Israeli envoys

Meanwhile, the Vatican announced on Wednesday that it had summoned the American and Israeli ambassadors to protest Israel’s annexation bid.

In separate meetings, Vatican Secretary of State Cardinal Pietro Parolin told Israeli Ambassador Oren David and US Ambassador Callista Gingrich of concerns “regarding possible unilateral actions that may further jeopardize the search for peace between Israelis and Palestinians, as well as the delicate situation in the Middle East,”

“As already declared … the Holy See reiterates that ... Israel and the State of Palestine have the right to exist and to live in peace and security, within internationally recognized borders,” the Vatican said in a statement.

“It thus appeals to the parties to do everything possible to reopen the process of direct negotiation, on the basis of the relevant Resolutions of the United Nations,” it added.

Amnesty urges firm action

Amnesty International called on the international community to take firm action against Israel’s annexation plan and its “law of the jungle” mentality.

“Members of the international community must enforce international law and restate that annexation of any part of the occupied West Bank is null and void,” said Saleh Higazi, deputy regional director for Amnesty Middle East and North Africa.

“They must also work to immediately stop the construction or expansion of illegal Israeli settlements and related infrastructure in the Occupied Palestinian Territories as a first step towards removing Israeli civilians living in such settlements,” he added.

Palestinians mark ‘Day of Rage'

Also on Wednesday, Palestinians held “Day of Rage” rallies both in the West Bank and the Gaza Strip against the Israeli expansionism.

In Gaza city, several thousand protesters gathered, some brandishing Palestinian national flags and placards condemning Trump.

Some demonstrators carried signs in English reading, “We Can’t Breathe Since 1948” and “Palestinian Lives Matter,” in reference to the American Black Lives Matter movement.

“The occupation has killed us and killed our children and deprived us of a good life. May God grant the Resistance victory,” a protester told the al-Aqsa TV.

“The resistance must be revived,” Gaza protester Rafeeq Inaiah told media persons. “Israel is afraid of force.”

Similar demonstrations also took place in the West Bank cities of Ramallah and Jericho.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.