Stereo Triangulation of Solar Type III Radio Bursts

Details Stereo Triangulation of Solar Type III Radio Bursts Stereo Triangulation of Solar Type III Radio Bursts

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh42a..02r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH42A-02

Physics

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

Scientific paper

The radio receivers on the twin STEREO spacecraft provide the first dedicated remote stereoscopic observations of interplanetary radio sources of solar origin. These observations, from widely separated vantage points, enable the remote location and tracking of radio sources through the 3D heliosphere by two spacecraft triangulation. The direction of arrival of the radiation is deduced from the observed differences in the amplitudes and phases of the signals on the three mutually orthogonal antennas on each STEREO spacecraft, as well as from the observed timing differences due to the different light propagation times from the source to each spacecraft. These observations, together with simultaneous remote radio direction finding and timing measurements from the Wind and Ulysses spacecraft, provide an unprecedented self-consistent observation of solar radio sources in interplanetary space. Now with the angular separation between the STEREO spacecraft in excess of 20 degrees, we present preliminary results of the first 3 and 4 spacecraft triangulations for solar type III radio bursts that were simultaneously observed by STEREO A, STEREO B, Wind and Ulysses. This information is used to determine the intrinsic physical characteristics of these radio sources, such as the brightness temperatures and beaming characteristics, at different observing radio frequencies. For example, we find that for an eastern source, the relative amplitudes between STEREO A and B differ by a factor of two, indicative of significant beaming in the radio source region.

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