Physics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..147g&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 6, p. 147-158.
Physics
8
Galactic Cosmic Rays, Heliosphere, Solar Wind, Voyager Project, Shock Discontinuity, Solar Rotation, Very Low Frequencies
Scientific paper
Estimates of heliosphere size based on analysis of VLF emissions measured by Voyager spacecraft are discussed. Observed spectral frequency drift of about 1 kHz/year leads to average heliopause radius less than 100 AU and local interstellar plasma density of 0.15/cu cm. The distance to the termination shock gives average shock distance R = 90 AU. Discussion of charge exchange processes in the shocked solar wind plasma indicates that observable fluxes of suprathermal neutral hydrogen atoms should be emitted. Atoms with energies corresponding to anomalous cosmic rays energy range should come preferentially from the tail side of the heliosphere. Plasma energy loss by energetic neutral atoms emission may cause a thermal collapse of the frontal heliosheath. Analysis of possible oscillations of the termination shock caused by varying solar wind is developed for small amplitude perturbations. Resulting shock displacements are less than 1 AU for variations associated with typical solar rotation and may attain about 10 AU for solar cycle time scale effects.
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