Interplanetary shock waves and comet brightness fluctuations during June-August 1972

Details Interplanetary shock waves and comet brightness fluctuations during June-August 1972 Interplanetary shock waves and comet brightness fluctuations during June-August 1972

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2001d&link_type=abstract

Journal of Geophysical Research, vol. 80, June 1, 1975, p. 2001-2012.

Physics

7

Brightness, Comets, Interplanetary Space, Shock Wave Propagation, Solar Activity Effects, Sudden Storm Commencements, Decametric Waves, Magnetic Storms, Magnetoacoustic Waves, Scintillation

Scientific paper

A series of anomalous events associated with solar activity are discussed which occurred in interplanetary space in June and August 1972. The events include interplanetary shock waves detected by Pioneers 9 and 10, Heos 2, Prognoz, and Prognoz 2; sudden commencements of geomagnetic storms; interplanetary scintillations; non-Io-associated decametric emission from Jupiter; and brightness variations of the periodic comets Schwassmann-Wachmann 1 and Giacobini-Zinner. Trajectory and deceleration characteristics are estimated from solar radio, on-site, and geomagnetic observations. The trajectories are found to be essentially those of piston-driven shock waves out to about 0.3 to 0.4 AU; beyond this distance, the shocks decayed to a blastlike motion with a shock velocity variation approximately inversely proportional to the heliocentric radius. Most of the shock waves apparently decayed into magnetoacoustic waves between 2 and 4 AU. It is suggested that this decay explains the lack of anomalous events at either Jupiter (5.2 AU) or P/Schwassmann-Wachmann 1 (5.6 AU) during August 1972.

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