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| Paper: |
VLA-SOHO Observations of Evolving Coronal Structures on the Sun |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
727 |
| Authors: |
Willson, R. F.; Lang, K. R.; Thompson, B.; Schuehle, U.; Zarro, D. M. |
| Abstract: |
Very Large Array (VLA) observations at 3.5, 6.2, and 91.6 cm wavelength have been combined with EUV spectroheliograms from the Solar and Heliospheric Observatory (SOHO) Coronal Diagnostic Spectrometer (CDS) and Extreme Ultraviolet Telescope (EIT) to study evolving sources in the transition region and corona above a solar active region. In some cases, transient events, lasting minutes to tens of minutes, were observed at both radio and EUV wavelengths, while other events were detected in only one spectral domain. The combined data sets suggest that the EUV-associated microwave sources are produced by thermal gyroresonance or nonthermal gyrosynchrotron radiation, primarily in regions of high magnetic field strength near sunspots. Observations at 91.6 cm also show the sudden appearance of a low-lying, nonthermal source in the low corona around the time that cool, outwardly-propagating plasma was detected by the SOHO/EIT. |
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