Three-dimensional MHD simulation of the April 14, 1994, interplanetary coronal mass ejection and its propagation to Earth and Ulysses

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Title:	Three-dimensional MHD simulation of the April 14, 1994, interplanetary coronal mass ejection and its propagation to Earth and Ulysses
Authors:	Dryer,M;Wu,CC;Smith,ZK
Contributors:	太空科學研究所
Keywords:	MAGNETIC CLOUD PROPAGATION;SOLAR-WIND;DYNAMICAL EVOLUTION;ECLIPTIC-PLANE;DISTURBANCES;TEMPERATURE;HELIOSPHERE;STREAMER
Date:	1997
Issue Date:	2010-06-29 18:39:26 (UTC+8)
Publisher:	中央大學
Abstract:	A three-dimensional (3-D), time-dependent, magnetohydrodynamic (MHD) model is used to simulate the interplanetary propagation of a disturbance that started in the low corona via the destabilization of a southern hemisphere helmet-streamer on April 14, 1994. A severe geomagnetic storm occurred at Earth, and a forward-reverse shock structure was detected at Ulysses (3.2 AU) at E30 degrees S60 degrees. The model is initiated at 18Rs (where Rs is the solar radius, 6.95 x 10(5) km) within the supersonic and super-Alfvenic region of the solar wind; hence no consideration is given to the disturbance's evolution from similar to 1Rs to 18Rs. We refer to the interplanetary disturbance as an interplanetary/coronal mass ejection (ICME) to indicate that it may be relevant to what has been referred to in the literature as a CME but is not related to the flux rope or magnetic cloud that has also received much attention. We find that the 3-D MHD model, with a simple pressure pulse (suggested by Yohkoh soft Xray observations), provides a satisfactory comparison with the SSC timing at Earth and the Ulysses observations.
Relation:	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Appears in Collections:	[Graduate Institute of Space Science] journal & Dissertation

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