Space-born and Ground-based Observations of a Solar Active Region and a Flare
Abstract
Observational data of the active solar region AR 2490 are discussed with an eye to underlying physical processes. Ground- and spaceborne measurements were made by radio, optical, and XUV instrumentation. A double structure observed at 6 and 20 cm wavelengths was overlying a sunspot group which displayed north polarity. The 6 cm emission was attributed to free-free emission, while the 20 cm feature was thought to be caused by gyroresonance absorption. An analytical formulation was developed which described the thermal component for maximum X ray intensities. A flare observed on June 10, 1980 was detected on H-alpha and C IV spectrographic bands. The origin of the emissions was fixed at the two feet of the X ray loop, with a radio emission coming from the top of the loop.
- Publication:
-
Sun and Planetary System
- Pub Date:
- 1982
- DOI:
- 10.1007/978-94-009-7846-1_29
- Bibcode:
- 1982ASSL...96..115C
- Keywords:
-
- Ground Stations;
- Solar Flares;
- Spaceborne Astronomy;
- Sunspots;
- Astronomical Observatories;
- Centimeter Waves;
- Extreme Ultraviolet Radiation;
- H Alpha Line;
- Radio Spectra;
- Solar Maximum Mission;
- Solar Physics;
- Spectral Line Width;
- Visible Spectrum;
- Solar Physics