Coronal Magnetic Structures Observing Campaign. IV. Multiwaveband Observations of Sunspot and Plage-associated Coronal Emission
Abstract
Results of simultaneous observations of an active region located near the central meridian obtained on December 18, 1987, are presented. An asymmetric looplike structure connects the strong leading sunspot with a nearby region of opposite polarity. Both 6- and 20-cm emission lie along this structure, rather than over the sunspot, with higher frequency emission originating closer to the footpoint inside the sunspot. The 20-cm emission is due to a superposition of second- and third-harmonic gyroemission, where the field strength is 160-300 G, while the 6-cm emission is due to third-harmonic gyroemission from a region where the magnetic field strength ranges from 547 to 583 G. X-ray data associated with an area of trailing plage are used to predict the brightness temperature structure due to thermal bremsstrahlung emission in the 6- and 20-cm wavebands.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1992
- DOI:
- 10.1086/171021
- Bibcode:
- 1992ApJ...386..347B
- Keywords:
-
- Faculae;
- Solar Corona;
- Solar Magnetic Field;
- Solar Radio Emission;
- Sunspots;
- Astronomical Observatories;
- Brightness Temperature;
- Magnetic Field Configurations;
- Very Large Array (Vla);
- Solar Physics;
- SUN: CORONA;
- SUN: FACULAE;
- FLOCCULI;
- SUN: RADIO RADIATION;
- SUN: SUNSPOTS;
- SUN: X-RAYS;
- GAMMA RAYS