Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...346l..53k&link_type=abstract
Astronomy and Astrophysics, v.346, p.L53-L56 (1999)
Astronomy and Astrophysics
Astrophysics
56
Shock Waves, Sun: Activity, Sun: Corona, Sun: Flares, Sun: Radio Radiation, Sun: X-Rays, Gamma Rays
Scientific paper
Large-scale shock waves in the solar corona are observed through their characteristic radio emission at decimetric and longer wavelengths (``type II bursts"). Their driver has not been identified so far. Particularly favorable observing conditions on 27 November 1997 allowed us to combine imaging and spectroscopic observations of the shock signature over a broad radio band with X-ray imaging of plasma structures at high time resolution. The data provide evidence that the shock is generated by rapidly expanding or disrupting structures in the outskirts of the flaring active region: (1) the type II emission starts above the top of a pre-existing, highly inclined loop system at the time when a plasma blob ejected along the legs reaches the top; (2) the alignment of type II source positions at successively lower frequencies is far from radial with respect to the associated flare, but seems to be related to the orientation of the pre-existing loop system and the motion of the plasma blob.
Aurass Henry
Delouis Jean-Marc
Khan Josef I.
Klein Karl-Ludwig
Vilmer Nicole
No associations
LandOfFree
X-ray and radio evidence on the origin of a coronal shock wave does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with X-ray and radio evidence on the origin of a coronal shock wave, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray and radio evidence on the origin of a coronal shock wave will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1495070