Physics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.3414e&link_type=abstract
Journal of Geophysical Research, vol. 85, July 1, 1980, p. 3414-3418.
Physics
8
Electron Density (Concentration), Electron Distribution, Helios 2, Solar Corona, Data Acquisition, Data Processing, Free Electrons, Solar Limb, Spacecraft Trajectories, Stellar Models, Time Lag
Scientific paper
The paper discusses the three and one-half months of single-frequency time delay data which were acquired from the Helios 2 spacecraft around the time of its solar occultation. The excess time delay due to integrated effect of free electrons along the signal's ray path could be separated and modeled following the determination of the spacecraft trajectory. An average solar corona and equatorial electron density profile during solar minimum were deduced from the time delay measurements acquired within 5-60 solar radii of the sun. As a point of reference at 10 solar radii from the sun, an average electron density was 4500 el/cu cm. However, an asymmetry was found in the electron density as the ray path moved from the west to east solar limb. This may be related to the fact that during entry into occultation the heliographic latitude of the ray path was about 6 deg, while during exit it was 7 deg. The Helios density model is compared with similar models deduced from different experimental techniques.
Edenhofer Peter
Esposito Pasquale B.
Lueneburg E.
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