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NASA satellite captures northern lights’ dazzling image



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Ottawa, NASA, NASA satellite ,dazzling image, northern lights, Earth Observatory,science,space, night,

The Norhern Lights

Ottawa: A NASA satellite has captured a dazzling infrared image of northern lights that appeared as swirls of glowing clouds over northern Canada on the night of December 22.

In a statement, NASA’s Earth Observatory said that the night after the winter solstice, NASA’s Suomi NPP spacecraft recorded the northern lights, or aurora borealis, across British Columbia, Alberta, Saskatchewan, Manitoba, Nunavut and northwest territories in Canada.

“The collision of solar particles and pressure on our planet’s magnetosphere accelerates particles trapped in the space around Earth. Those particles are sent crashing down into Earth’s upper atmosphere — at altitudes of 100 to 400 km — where they excite oxygen and nitrogen molecules and release photons of light. The results are rays, sheets and curtains of dancing light in the sky,” NASA said in a statement explaining the northern lights.

The solar storms that create the stunning manifestation of the northern lights occur roughly every 11 years.”The last cycle peak occurred in 2013, though NASA researchers reported that solar maximum was the weakest observed in a century,” the report noted.According to a report in Live Science on Wednesday, the satellite’s Visible Infrared Imaging Radiometer Suite captured the northern lights display from 824 km above the Earth.


NASA’s Voyager 2 becomes second spacecraft to reach interstellar space




Washington: Nasa’s Voyager 2 has become only the second human-made object to reach the space between stars.

Nasa said that the spacecraft left the region of the sun’s influence last month and is now beyond the outer boundary of the heliosphere, about 11 billion miles from Earth. It is trailing Voyager 1, which reached interstellar space – the vast, mostly empty area between star systems – in 2012.

The study, published in the journal Nature Astronomy, confirmed Voyager 2’s passage on November 5, 2018, into the ISM by noting a definitive jump in plasma density detected by a plasma wave instrument on the spacecraft.

The marked increase in plasma density is evidence of Voyager 2 journeying from the hot, lower-density plasma characteristic of the solar wind to the cool, higher-density plasma of interstellar space, the researchers said.

It is also similar to the plasma density jump experienced by Voyager 1 when it crossed into interstellar space, they said.

“In a historical sense, the old idea that the solar wind will just be gradually whittled away as you go further into interstellar space is simply not true,” said Professor Don Gurnett from the University of Iowa, and corresponding author on the study.

Data from the instrument on Voyager 2 also gives additional clues to the thickness of the heliosheath, the outer region of the heliosphere and the point where the solar wind piles up against the approaching wind in interstellar space, which Gurnett likens to the effect of a snowplow on a city street.

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