HR: 16:00h
AN: SH42E-01 INVITED     [PDF]
TI: Radio Investigations of the Inner Heliosphere
AU: * Bougeret, J
EM: jean-louis.bougeret@obspm.fr
AF: LESIA-CNRS-Observatoire de Paris, 5, place Jules Janssen, Meudon, 92195 France
AB: We review recent observations of the thermal and non-thermal radio radiation in the inner heliosphere. The thermal radiation can yield information on both quiescent and transient structures, while non-thermal radiation traces populations of energetic electrons associated with high energy phenomena, such as beams of energetic electrons and shock waves. Results very much depend on the type of instrument which is used: spectrograph or imager, ground-based or space-borne. The frequency range of radio sources in the inner heliosphere corresponds to the metric, decametric, hectometric, and kilometric bands. Only the metric and a small part of the decametric range can be accessed from the ground. The longer wavelengths are blocked by the terrestrial ionosphere and observations from space are required. Long wavelength require extremely long baseline interferometers in order to produce images. This has never been done from space as yet. There are some techniques, however, to determine the direction of the source centroid. We will try to provide an integrated view of the different approaches, focusing on the physical nature of the phenomena which are observed. Finally we will mention future programs in this field: Stereo, FASR, LOFAR, SIRA, LWS/Sentinels among others.
DE: 2100 INTERPLANETARY PHYSICS
DE: 2114 Energetic particles, heliospheric (7514)
DE: 2118 Energetic particles, solar
DE: 2139 Interplanetary shocks
DE: 7534 Radio emissions
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting