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Complex, Radio-rich Sun-Earth Connections: April 7, and November 3-4, 1997,
and May 2, 1998
Our understanding of Sun-Earth connection events has recently been enriched
by the steady monitoring of the Sun by the LASCO coronograph on the SOHO
spacecraft, an instrument having many times the temporal resolution and
sensitivity of earlier missions. This high sensitivity allowed the observation
of several disturbances associated Halo-CMEs, Clear signatures indicative
of a shock associate (SA) both in SOHO EIT images of the low corona and
the remote tracking with WIND WAVES instrument of the slowly drifting (type
2) radio bursts in the metric and decametric ranges. In this paper we present
observational evidence, through the monitoring of the MeV shock energized
particles, of the evolution of the shock associate (SA) through the interplanetary
medium up to its observation at 1 AU. We also discuss indications of the
presence or absence of an SA driver (ejecta) a few to several hours behind
the SA in the solar wind at 1 au.
Authors: D.B. Berdichevsky, C.J. Farrugia, R.P. Lepping, B.J.
Thompson, T.H. Zurbuchen,. D.V. Reames, M.L. Kaiser, and C. St Cyr
Organization: R-ITSS at NASA/GSFC
Address: Mail Code 690
NASA/Goddard Space Flight Center
Greenbelt, MD 20740
Above is background material for archival reference only.