Simulation of January 1-7, 1978 events

Details Simulation of January 1-7, 1978 events Simulation of January 1-7, 1978 events

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9211183c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Oct. 1, 1987, p. 11183-11188. Previously announced in STAR as N87-252

Physics

2

Interplanetary Space, Shock Wave Interaction, Shock Waves, Solar Activity Effects, Solar Flares, Solar Wind, Coalescing, Explorer 50 Satellite, Helios 1, Helios 2, Interplanetary Magnetic Fields, Observation, Simulation, Voyager 2 Spacecraft

Scientific paper

The solar wind disturbances of January 1 to 7, 1978 are reconstructed by a modeling method. First, the interplanetary magnetic field (IMF) background pattern, including a corotating shock, is reproduced using the Stanford source surface map. Then, two solar flares with their onset times on January 1, 0717 UT at S17 deg E10 deg and 2147 UT S17 deg E32 deg, respectively, are selected to generate two interplanetary transient shocks. It is shown that these two shocks interacted with the corotating shock, resulting in a series of interplanetary events observed by four spacecraft, Helios 1 and 2, IMP-8 (Interplanetary Monitoring Platform 8), and Voyager 2. Results show that these three shock wave interact and coalesce in interplanetary space such that Helios 2 and Voyager 2 observed only one shock and Helios 1 and IMP-8 observed two shocks. All shocks observed by the four spacecraft, except the corotating shock at Helios 1, are either a transient shock or a shock which is formed from coalescing of the transient shocks with the corotating shock. The method is useful in reconstructing a very complicated chain of interplanetary events observed by a number of spacecraft.

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