coronal loop


The upper atmosphere of the Sun is dominated by plasma filled magnetic loops (coronal loops) whose temperature and pressure vary over a wide range. The appearance of coronal loops follows the emergence of magnetic flux, which is generated by dynamo processes inside the Sun. Emerging flux regions (EFRs) appear when magnetic flux bundles emerge from the solar interior through the photosphere and into the upper atmosphere (chromosphere and the corona). The characteristic feature of EFR is the -shaped loops (created by the magnetic buoyancy/Parker instability), they appear as developing bipolar sunspots in magnetograms, and as arch filament systems in . EFRs interact with pre-existing magnetic fields in the corona and produce small flares (plasma heating) and collimated plasma jets. The GIFs above show multiple energetic jets in three different wavelengths. The light has been colorized in red, green and blue, corresponding to three coronal temperature regimes ranging from ~0.8Mk to 2MK. 

Image Credit: SDO/U. Aberystwyth

Solar System: Things to Know This Week

Making every night science movie night with these amazing videos.

1. Pure Beauty 

Our star sprouting coronal loops courtesy of the NASA sun team. See the full video:

2. Where’s the last place you’d expect to find enough ice to bury a city? 

Answer: Mercury, the closest planet to the sun. Watch the video:

3. The Mars Fleet 

Only Earth has more satellites studying it. Full video:

4. A Star-Studded Cast

Check out NASA’s satellite fleet of Earth observers. See the video:

5. Jupiter in Ultra HD 

Thanks, Hubble Space Telescope! See the video:

6. A Tear Jerker 

Our Cassini spacecraft starts her 4.5-month Grand Finale this week. Full video:

7. Faster Than the Speed of Sound

Winds on Neptune travel faster than the speed of sound. Full video:

8. A Musical Number

This one features the planet Uranus doing pop and lock. Full video:

9. Up Close and Personal 

Thanks to our New Horizons mission, we’ve been able to get up close and with Pluto. Full video:

10: The Treasure Trove

TRAPPIST-1 is a treasure trove of seven Earth-sized planets orbiting a distant star. Full video:

Discover more lists of 10 things to know about our solar system HERE.

Make sure to follow us on Tumblr for your regular dose of space:

Solar surges are cool jets of plasma ejected in the solar atmosphere from chromospheric into coronal heights. This particular surge has been captured in a loopy structure and streamed sunwards along the magnetic field lines.

Surges are associated with active regions and they are most likely triggered by magnetic reconnection and magnetohydrodynamic (MHD) wave activity. According to their morphological features, surge prominences can be classified into three types: jet-like, diffuse, and closed loop (above). Jet-like and diffuse surges are associated with coronal mass ejections (CMEs), but the closed-loop surges are not because the initial acceleration of the eruption is slowed down and finally stopped by the overlying coronal loops.

Credit: SDO/ LMSAL

Coronal loops in an active region of the Sun

An active region of the sun just rotating into the view of NASA’s Solar Dynamics Observatory gives a profile view of coronal loops over about a two-day period, from Feb. 8-10, 2014. Coronal loops are found around sunspots and in active regions. These structures are associated with the closed magnetic field lines that connect magnetic regions on the solar surface. Many coronal loops last for days or weeks, but most change quite rapidly. This image was taken in extreme ultraviolet light.

Image credit: NASA/Solar Dynamics Observatory


Edge-On Coronal Loops Captured by NASA’s Solar Dynamics Observatory

all my life: Solar corona, photographed by Solar Dynamics Observatory, 23rd & 24th June 2012.

Sort of a baby coronal loop - still, according to a quick calculation, the feature is about a million km across (for reference, Earth is 12,800 km wide).

31 images, 1 every 15 minutes. Sun itself masked in post.

Image credit: NASA/SDO, AIA/EVE/HMI. Animation: AgeOfDestruction.

anonymous asked:

How hot is the sun's corona?

For those who don’t know, a star’s corona is the disc of plasma surrounding it. On Earth when a solar eclipse of the sun happens we can see the corona. It looks like this:

The sun’s corona is actually hotter than the actual outside of the sun. It is weird to think that the stuff surrounding the sun, is hotter (yet dimmer) than the suns photosphere…. I mean, the sun *is* shooting out plasma after all.

The temperature ranges from 1,000,000 K to 3,000,000 K. You cannot even physically imagine this kind of heat. The photosphere, the visible outside of the sun is 6000 K. Astronomers haven’t even come to a true consensus upon *why* the corona is so hot. 

On that note, here is a cool picture of a coronal loop 

and I hope this inspired you to learn all about stellar astrophysics.