* Astronomy

Members Login
Post Info TOPIC: The Sun


L

Posts: 130044
Date:
RE: The Sun
Permalink  
 


The Sun 10 Jul 14

Duration: 48 mins

How was the Sun formed, and what do we know about its structure and the processes going on inside our nearest star? With Carolin Crawford, Gresham Professor of Astronomy and Fellow of Emmanuel College, Cambridge; Yvonne Elsworth, Professor of Helioseismology at the University of Birmingham; and Louise Harra, Professor of Solar Physics at UCL Mullard Space Science Laboratory.

Download 22MB



__________________


L

Posts: 130044
Date:
Solar tornados
Permalink  
 


Title: A solar tornado triggered by flares?
Authors: N. K. Panesar, D. E. Innes, S. K. Tiwari, B. C. Low

Solar tornados are dynamical, conspicuously helical magnetic structures mainly observed as a prominence activity. We investigate and propose a triggering mechanism for the solar tornado observed in a prominence cavity by SDO/AIA on September 25, 2011. High-cadence EUV images from the SDO/AIA and the Ahead spacecraft of STEREO/EUVI are used to correlate three flares in the neighbouring active-region (NOAA 11303), and their EUV waves, with the dynamical developments of the tornado. The timings of the flares and EUV waves observed on-disk in 195\AA\ are analysed in relation to the tornado activities observed at the limb in 171\AA. Each of the three flares and its related EUV wave occurred within 10 hours of the onset of the tornado. They have an observed causal relationship with the commencement of activity in the prominence where the tornado develops. Tornado-like rotations along the side of the prominence start after the second flare. The prominence cavity expands with acceleration of tornado motion after the third flare. Flares in the neighbouring active region may have affected the cavity prominence system and triggered the solar tornado. A plausible mechanism is that the active-region coronal field contracted by the 'Hudson effect' due to the loss of magnetic energy as flares. Subsequently the cavity expanded by its magnetic pressure to fill the surrounding low corona. We suggest that the tornado is the dynamical response of the helical prominence field to the cavity expansion.

Read more (5869kb, PDF)



__________________


L

Posts: 130044
Date:
The Sun
Permalink  
 


Giant solar tornado caught in rare NASA tape

Spoiler



__________________


L

Posts: 130044
Date:
Solar tornadoes
Permalink  
 


  Solar tornadoes caught on film by Aberystwyth scientists

Scientists at Aberystwyth University have discovered a group of solar tornados - several times wider than the Earth - on the face of the sun.
Researchers think it's the first time images like these have ever been filmed.

Read more 



__________________


L

Posts: 130044
Date:
The Sun
Permalink  
 


The Sun

Audio mashup (4.73mb, mp3)


__________________
Page 1 of 1  sorted by
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard