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A Revised Shock Time of Arrival (STOA) Model for Interplanetary Shock Propagation: STOA-2 View all abstracts by submitter

Yong-Jae Moon   Submitted: 2002-04-05 17:40

We have examined a possibility for improvement of the STOA (Shock Time Of Arrival) model for interplanetary shock propagation. In the STOA model, the shock propagating velocity is given by V_s sim R-N with N=0.5, where R is the heliocentric distance. Noting observational and numerical findings that the radial dependence of shock wave velocity depends on initial shock wave velocity, we suggest a simple modified STOA model (STOA-2) which has a linear relationship between initial coronal shock wave velocity (Vis) and its deceleration exponent(N), N=0.05+4 imes10-4Vis, where Vis is a numeric value expressed in units of km s-1. Our results show that the STOA-2 model not only removes a systematic dependence of the transit time difference predicted by the previous STOA model on initial shock velocity, but also reduces the number of events with large transit time differences.

Authors: Y.-J. Moon, M. Dryer, Z. Smith, Y. D. Park, K. S. Cho

Publication Status: Geophysical Research Letter, 2002, in press
Last Modified: 2002-04-06 00:45
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