Circular Polarization Observed in Kilometric Solar Type III Radio Storms

Details Circular Polarization Observed in Kilometric Solar Type III Radio Storms Circular Polarization Observed in Kilometric Solar Type III Radio Storms

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33c..04r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH33C-04

Astronomy and Astrophysics

Astronomy

6954 Radio Astronomy, 7534 Radio Emissions

Scientific paper

While circular polarization in solar radio emissions are readily observed at metric wavelengths, no significant polarization has ever been reported for type II and type III radio emissions below 1 MHz. While small amounts of polarization may be present in these solar radio bursts at kilometric wavelengths, this is very difficult to detect due to the relative weakness and burstiness of type II emissions and due to the relatively short duration of the type III radio emissions, especially at the higher frequencies. The semi-continuous radio emissions observed for "kilometric" type III radio storms, which last for many days and are quite ubiquitous at solar maximum, offer an opportunity to test for small amounts of wave polarization in solar radio emissions below 1 MHz. Using the WAVES radio receivers on the Wind spacecraft, we have analyzed a number of type III radio storms, observed during solar cycle 23, and have detected a small, but statistically significant, amount of circular polarization. This polarization, which is in the right-hand sense for some storms and in the left-hand sense for others, is on the order of 5% and the degree of circular polarization is found to decrease with decreasing frequency. The radiation characteristics for one of these storms also exhibits an unusual oscillation with a period of 1.6 hours. These observations, suggesting that small amounts of circular polarization do exist for solar radio emissions below 1 MHz, may provide information on the characteristics of the solar active region from which these type III storms originate.

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