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August 1972 solar-terrestrial events: interplanetary magnetic field observations

Journal Article:

Abstract

A review is presented of the interplanetary magnetic field observations acquired in early August 1972 when four solar flares erupted in McMath Plage region 1976. Measurements of the interplanetary field were obtained by Earth satellites, HEOS-2 and Explorer 41, and by Pioneers 9 and 10 which, by good fortune, were radially aligned and only 45/sup 0/ east of the Earth-Sun direction. In response to the four flares, four interplanetary shocks were seen at Earth and at Pioneer 9, which was then at a heliocentric distance of 0.78 AU. However, at Pioneer 10, which was 2.2 AU from the Sun, only two forward shocks and one reverse shock were seen. The available magnetic field data acquired in the vicinity of the shocks are presented. Efforts to identify corresponding shocks at the several locations and to deduce their velocities of propagation between 0.8 and 2.2 AU are reviewed. The early studies were based on average velocities between the Sun and Pioneer 9, the Sun and Earth and the Sun and Pioneer 10. A large deceleration of the shocks between the Sun and 0.8 AU as well as between 0.8 and 2.2 AU was inferred. More recently the local velocities of the shocks  More>>
Authors:
Smith, E J [1] 
  1. Jet Propulsion Lab., Pasadena, Calif. (USA)
Publication Date:
Oct 01, 1976
Product Type:
Journal Article
Reference Number:
AIX-08-310231; EDB-77-102683
Resource Relation:
Journal Name: Space Sci. Rev.; (Netherlands); Journal Volume: 19:4
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; INTERPLANETARY MAGNETIC FIELDS; ACCELERATION; FORBUSH DECREASE; MAGNETOSHEATH; PLAGES; PLASMA; SHOCK WAVES; SOLAR FLARES; SOLAR WIND; VELOCITY; MAGNETIC FIELDS; SOLAR ACTIVITY; 640203* - Atmospheric Physics- Magnetospheric Phenomena- (-1987); 640104 - Astrophysics & Cosmology- Solar Phenomena
OSTI ID:
7259489
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: SPSRA
Submitting Site:
INIS
Size:
Pages: 661-686
Announcement Date:
Jun 01, 1977

Journal Article:

Citation Formats

Smith, E J. August 1972 solar-terrestrial events: interplanetary magnetic field observations. Netherlands: N. p., 1976. Web.
Smith, E J. August 1972 solar-terrestrial events: interplanetary magnetic field observations. Netherlands.
Smith, E J. 1976. "August 1972 solar-terrestrial events: interplanetary magnetic field observations." Netherlands.
@misc{etde_7259489,
title = {August 1972 solar-terrestrial events: interplanetary magnetic field observations}
author = {Smith, E J}
abstractNote = {A review is presented of the interplanetary magnetic field observations acquired in early August 1972 when four solar flares erupted in McMath Plage region 1976. Measurements of the interplanetary field were obtained by Earth satellites, HEOS-2 and Explorer 41, and by Pioneers 9 and 10 which, by good fortune, were radially aligned and only 45/sup 0/ east of the Earth-Sun direction. In response to the four flares, four interplanetary shocks were seen at Earth and at Pioneer 9, which was then at a heliocentric distance of 0.78 AU. However, at Pioneer 10, which was 2.2 AU from the Sun, only two forward shocks and one reverse shock were seen. The available magnetic field data acquired in the vicinity of the shocks are presented. Efforts to identify corresponding shocks at the several locations and to deduce their velocities of propagation between 0.8 and 2.2 AU are reviewed. The early studies were based on average velocities between the Sun and Pioneer 9, the Sun and Earth and the Sun and Pioneer 10. A large deceleration of the shocks between the Sun and 0.8 AU as well as between 0.8 and 2.2 AU was inferred. More recently the local velocities of the shocks at Pioneers 9 and 10 have become available. A comparision of these velocities shows little, if any, deceleration between 0.8 and 2.2 AU and implies that most or all of the deceleration actually occurred nearer the Sun. Evidence is also presented that shows a significant departure of the flare-generated shock fronts from spherical symmetry.}
journal = {Space Sci. Rev.; (Netherlands)}
volume = {19:4}
journal type = {AC}
place = {Netherlands}
year = {1976}
month = {Oct}
}