Theoretical Models of Free-free Microwave Emission from Solar Magnetic Loops
Abstract
The free-free microwave emission is calculated from a series of model magnetic loops. The loops are surrounded by a cooler external plasma, as required by recent simultaneous X ray and microwave observations, and a narrow transition zone separating the loops from the external plasma. To be consistent with the observational results, upper limits on the density and temperature scale lengths in the transition zone are found to be 360 km and 250 km, respectively. The models which best produce agreement with X-ray and microwave observations also yielded emission measure curves which agree well with observational emission measure curves for solar active regions.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1988
- DOI:
- 10.1086/166204
- Bibcode:
- 1988ApJ...327..417B
- Keywords:
-
- Bremsstrahlung;
- Coronal Loops;
- Microwave Emission;
- Solar Magnetic Field;
- Solar Wind;
- Brightness Temperature;
- Electron Density (Concentration);
- Radio Astronomy;
- Refractivity;
- Solar Activity;
- Solar Physics;
- RADIATION MECHANISMS;
- SUN: CORONA;
- SUN: RADIO RADIATION