Unusual Solar Radio Event: May 18-22, 2002

Details Unusual Solar Radio Event: May 18-22, 2002 Unusual Solar Radio Event: May 18-22, 2002

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72c..02r&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH72C-02

Other

6964 Radio Wave Propagation, 6969 Remote Sensing, 7534 Radio Emissions

Scientific paper

From May 18 to 22, 2002 an intense, wideband (500 kHz to 5 MHz) solar radio event was observed by the WAVES receiver on the Wind spacecraft. This unique event, which was observed continuously for 5 days, was characterized by fine frequency structures (16 sec), 1.5 to 2 hour periodicities, and by nearly 100% circularly polarized emission. This is the only such event observed by Wind in its 8 years of operation. (The only other example of an event of this nature may have been observed more than 20 years ago by the ICE spacecraft.) The direction-finding analysis for this event indicates that the radio source may lie somewhere between 0.08 and 0.2 AU from the sun and that the source is relatively small. The corresponding frequency spectrum has a peaked distribution, with peak frequency decreasing with time--perhaps suggesting radiation trapped in an expanding structure (at the time of the radio event three interacting solar ejecta appeared to be passing over the Wind spacecraft). The radio event could possibly be a unique kilometric manifestation of a moving type IV burst. The radiation mechanism is unknown--possibilities include plasma emission, gyro-synchrotron, and cyclotron maser. Indeed this emission has characteristics more typical of planetary emissions than of solar emissions. This unusual radio event was almost immediately followed by the unique period of extremely low solar wind density.

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