Stereo Solar Radio Observations in the Inner Heliosphere

Details Stereo Solar Radio Observations in the Inner Heliosphere Stereo Solar Radio Observations in the Inner Heliosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh21b0405k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH21B-0405

Physics

7513 Coronal Mass Ejections, 7534 Radio Emissions, 6964 Radio Wave Propagation, 6969 Remote Sensing

Scientific paper

The evolution of solar transient phenomena through the inner heliosphere can be remotely revealed via the radio emissions that they generate. The type II radio bursts are signatures of the propagation of CMEs, while type III radio bursts represent the propagation of energetic electrons associated with flares. Up to now, the remote radio tracking of these solar transients has been somewhat limited due to the lack of detailed knowledge of the interplanetary density structure in the inner heliosphere. The STEREO radio (SWAVES) observations will greatly improve this situation by locating the radio sources by two-spacecraft triangulation, thus eliminating the need for postulating an interplanetary density model. Conversely, since the observed frequency of the radio sources depend on the plasma density in the source region, the tracking of solar transients by the STEREO triangulation will provide important information on the plasma density in the inner heliosphere. For example, the plasma density measured in-situ by the STEREO spacecraft can be extrapolated, albeit in a model-dependent way, to the region of the radio source and directly compared with the observed radio frequency. In this way it can be determined whether these radio emissions originate in density enhanced regions. Up to now, some two-spacecraft triangulation analyses have been possible between the Wind and Ulysses spacecraft, but these observations have been limited by the less than of ideal spatial orientations between the two spacecraft. Nevertheless, we will discuss triangulation analyses that have been achieved by Wind and Ulysses for both type II and type III radio observations and illustrate how such analyses will be improved by the STEREO mission.

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