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Ann. Geophys., 20, 293-299, 2002
www.ann-geophys.net/20/293/2002/
© European Geosciences Union 2002
A Survey of large, rapid solar wind dynamic pressure changes observed by Interball-1 and IMP 8
P. A. Dalin1, G. N. Zastenker1, K. I. Paularena2, and J. D. Richardson2
1Space Research Institute (IKI), ul. Profsouznaya, 84/32, Moscow, GSP-7, 117997, Russia
2Center for Space Research MIT, Cambridge, MA, 02139, USA
Correspondence to: P. A. Dalin (pdalin@iki.rssi.ru)
Abstract. The high time-resolution
solar wind ion flux measurements from Interball-1 and IMP 8 show about one
hundred large, rapid dynamic the pressure changes each year. We cataloged these
events by the size and transition time of the pressure changes and present a
statistical survey of these events. We find that the majority of the pressure
changes of more than 1–2 nPa occur over a very short time period, on the
order of a few minutes or less. Most of the large pressure changes not
associated with shocks are due solely to density changes with speed remaining
constant. We find that pressure balance between the thermal and magnetic
pressures is not maintained across most of these events, so these events are
still evolving.
Key words. Interplanetary physics
(solar wind plasma)
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