VLA Observations of Solar Metric and Decametric Bursts and Their Relationship to Evolving Coronal Magnetic Structures

Details VLA Observations of Solar Metric and Decametric Bursts and Their Relationship to Evolving Coronal Magnetic Structures VLA Observations of Solar Metric and Decametric Bursts and Their Relationship to Evolving Coronal Magnetic Structures

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp51b01w&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP51B-01

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7509 Corona, 7524 Magnetic Fields

Scientific paper

We discuss recent Very Large Array (VLA) observations of the Sun at 91 and 400 cm that were made in collaboration with the SOHO, TRACE and Wind solar missions. The combined data have been used to study the spatial location, magnetic environment and temporal evolution of nonthermal electrons that are produced during flares and related events on the Sun. These include the nonthermal radio signatures of evolving EUV loops(SOHO EIT, TRACE), coronal mass ejections (LASCO) and interplanetary Type III bursts (Wind). On one day, our VLA observations show the onset of intense 91 and 400 cm burst emission during an X1 GOES soft X-ray burst observed by Yohkoh and prior to a CME observed by LASCO. VLA snapshot maps showed that the 400 cm burst site varied throughout the course of the flare, probably reflecting changes in the structure of the coronal magnetic fields along which the energetic particles traveled. This, and other events, was detected by the WAVES experiment on Wind which showed intense, fast-drifting interplanetary Type III bursts following the metric and decimetric event detected by the VLA. We also discuss the results of a recent VLA/SOHO/TRACE/Nancay Radioheliograph campaign designed to study the relationship between decametric Type III bursts and their possible association with Type I noise storms and evolving loops.

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