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NASA rocket chasing the source of the sun's hot atmosphere 5nvklj





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NASA rocket chasing the source of the sun's hot atmosphere

Dragon
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Post by Dragon 29/05/21, 03:37 am

After glimpsing faint but widespread super-heated material in the Sun's outer atmosphere, a NASA sounding rocket is going back for more.

This time, they're carrying a new instrument optimized to see it across a wider region of the Sun.

The mission, known as Extreme Ultraviolet Normal Incidence Spectrograph, or EUNIS for short, will launch from the White Sands Missile Range in New Mexico.

The launch window opens on May 18, 2021.


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Post by Dragon 29/05/21, 03:40 am

NASA rocket chasing the source of the sun's hot atmosphere Nasa-rocket-chasing-th
Credit: NASA/EUNIS/SDO

During its 2013 flight, NASA's EUNIS sounding rocket examined light from the Sun in the area shown by the white line (imposed over an image of the sun from NASA's Solar Dynamics Observatory) then separated the light into various wavelengths (as shown in the lined images—spectra—on the right and left) to identify the temperature of material observed on the Sun.

The spectra provided evidence to explain why the sun's atmosphere is so much hotter than its surface.


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Dragon
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Post by Dragon 29/05/21, 03:41 am

NASA rocket chasing the source of the sun's hot atmosphere Nasa-rocket-chasing-th-1
. Credit: NASA/SDO

An active region erupts with an X-class flare (the most powerful classification of solar flare) in October 2013, as observed by a telescope on NASA’s Solar Dynamics Observatory that observes light at a 9.4 nanometer wavelength (colorized in green).

EUNIS’s measurements will help calibrate this wavelength channel to pin down the temperature of the observed material more precisely.


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NASA rocket chasing the source of the sun's hot atmosphere 334pu7m
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Post by Dragon 29/05/21, 03:42 am



EUNIS Sees Evidence for Nanoflare Coronal Heating

The new observations show temperatures in the atmosphere so hot that only one current theory explains them: something called nanoflares - a constant peppering of impulsive bursts of heating, none of which can be individually detected -- provide the mysterious extra heat.

These new observations come from just six minutes worth of data from one of NASA's least expensive type of missions, a sounding rocket.

The EUNIS mission, short for Extreme Ultraviolet Normal Incidence Spectrograph, launched on April 23, 2013, gathering a new snapshot of data every 1.3 seconds to track the properties of material over a wide range of temperatures in the complex solar atmosphere


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