VLA Decimetric Observations of EUV Transient Events Detected by SOHO and TRACE

Details VLA Decimetric Observations of EUV Transient Events Detected by SOHO and TRACE VLA Decimetric Observations of EUV Transient Events Detected by SOHO and TRACE

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..715w&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

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Very Large Array (VLA) observations of active region at 2, 6, 20.7 and 91.6 cm are compared with simultaneous EUV images taken by SOHO and TRACE at several wavelengths. The main objective of these observations is to study the properties of evolving magnetic loop structures at different heights in the transition region and corona where impulsive and long-lasting energy release takes place. VLA observations at 2 and 6 cm wavelength have been used to measure the sizes, locations and lifetimes of small-scale, variable magnetic structures detected by the SOHO EIT and TRACE and to discriminate between thermal and nonthermal emission mechanisms in these sources. Our VLA 91 cm observations have been used to study the relationship between long-lasting Type I noise storm emission and underlying compact magnetic loops seen by EIT and TRACE as well as larger coronal structures seen at the solar limb by the LASCO coronagraphs. Our results show that one one day, a Type I noise storm enhancement began a few tens of minutes after a prominent EUV ejection event detected by TRACE, suggesting that the nonthermal noise storm emission may have been triggered by the diffusion of magnetic fields and particles from the underlying site of energy release. On other days, there appears to be a weaker correlation between changes in the intensity of the noise storm emission and underlying EUV events, suggesting an independent origin for the noise storm emission in these regions.

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