Radio Observations of Weak Coronal Transients

Details Radio Observations of Weak Coronal Transients Radio Observations of Weak Coronal Transients

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spro.proc..111k&link_type=abstract

Solar Physics with Radio Observations, Proceedings of the Nobeyama Symposium, held in Kiyosato, Japan, Oct. 27-30, 1998, Edited

Physics

Scientific paper

In this review we discuss radio observations of weak coronal transients. We concentrate on the transient events observed primarily by Yohkoh/SXT and to a smaller extent by SOHO/EIT. The radio observations are those obtained with the Very Large Array (VLA) in microwaves, the Nancay (France) metric radioheliograph at 150 - 450 MHz and the Nobeyama RadioHeliograph (NRH) at 17 GHz. We discuss the observational characteristics of X-ray bright point flares at meter wavelengths and in microwaves, and provide evidence that both thermal and nonthermal processes occur in these small scale flaring events. Similarly, radio observations of X-ray jets in microwaves and at meter wavelengths provide evidence for both thermal and nonthermal processes in these dynamic coronal phenomena. Nonthermal radio emission in the form of metric type III bursts is produced by electron beams propagating along the jet, whereas microwave emission comes mostly from the jet base. We discuss active region transient brightenings (ARTB's) and show that their radio emission can be purely thermal, thermal gyro- resonance or nonthermal gyrosynchrotron radiation. We discuss one form (radio-selected) of quiet Sun transient brightenings located far from active regions. We provide evidence that weak plasma ejections following flares is observed at metric wavelengths in the form of transient continuum emission. Finally, we discuss the time-varying polar brightenings at 17 GHz, and their relationship to polar erupting plumes observed by SOHO-EIT.

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