HR: 10:50h
AN: SH42A-02    [Abstracts]
TI: Stereo Triangulation of Solar Type III Radio Bursts
AU: * Reiner, M J
EM: michael.reiner@gsfc.nasa.gov
AF: Catholic University and NASA/GSFC, Code 674, Greenbelt, MD 20771, United States
AU: Goetz, K
EM: Goetz@umn.edu
AF: University of Minnesota, School of Physics and Astronomy, Minneapolis, MN 20771, United States
AU: Fainberg, J
EM: joseph.fainberg@nasa.gov
AF: NASA Goddard Space Flight Center, Code 673, Greenbelt, MD 20771, United States
AU: Kaiser, M
EM: Michael.Kaiser@nasa.gov
AF: NASA Goddard Space Flight Center, Code 674, Greenbelt, MD 20771, United States
AU: Cecconi, B
EM: baptiste.cecconi@obspm.fr
AF: Observatoire de Paris, LESIA, Meudon, MD 92195, France
AU: Makisimovic, M
EM: milan.maksimovic@obspm.fr
AF: Observatoire de Paris, LESIA, Meudon, MD 92195, France
AU: Hoang, S
EM: song.hoang@obspm.fr
AF: Observatoire de Paris, LESIA, Meudon, MD 92195, France
AU: Bougeret, J
EM: Jean-Louis.Bougeret@obspm.fr
AF: Observatoire de Paris, LESIA, Meudon, MD 92195, France
AU: Bale, S D
EM: BALE@sunspot.ssl.berkeley.edu
AF: Univerity of California, Berkeley, Space Sciences Laboratory, Berkeley, CA 99999, United States
AB: 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.
DE: 6964 Radio wave propagation
DE: 6969 Remote sensing
DE: 7534 Radio emissions
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting