Flaring Arches - Part One
Abstract
`Flaring arches" is a name assigned to a particular component of some flares. This component consists of X-ray and Hα emission which traverses a coronal arch from one to the other of its chromospheric footpoints. The primary footpoint is at the site of a flare. The secondary footpoint, tens of thousands of kilometers distant from the source flare, but in the same active region, brightens in Hα concurrent with the beginning of the hard X-ray burst at the primary site. From the inferred travel time of the initial exciting agent we deduce that high speed electron streams travelling through the arch must be the source of the initial excitation at the secondary footpoint. Subsequently, a more slowly moving agent gradually enhances the arch first in X-rays and subsequently in Hα, starting at the primary footpoint and propagating along the arch trajectory. The plasma flow in Hα shows clearly that material is injected into the arch from the site of the primary footpoint and later on, at least in some events, a part of it is also falling back.
- Publication:
-
Solar Physics
- Pub Date:
- March 1988
- DOI:
- 10.1007/BF00171717
- Bibcode:
- 1988SoPh..116...91M
- Keywords:
-
- H Alpha Line;
- Solar Flares;
- Solar X-Rays;
- Arcs;
- Chromosphere;
- Imaging Spectrometers;
- Radio Emission;
- Solar Physics;
- Flare;
- Travel Time;
- Solar Observatory;
- Extensive Series;
- Initial Excitation