This research was done during the author’s visit to the Florida State University. The author is sincerely thankful to Prof. T. N. Krishnamurti for providing the opportunity for the visit. It is a pleasure to thank Drs. A. da Silva, A. Kasahara, I. M. Navon, X. Zou, D. Zupanski, and M. Zupanski for helpful discussions. Special thanks go to Mr. R. Treadon for correcting the English errors in the manuscript. This research was supported by NSF Grant ATM 9312537 and NASA Grants NAG 8-914 and NAG 5-1595. The computations for this work were carried out on the CRAY-C90 at San Diego Supercomputer Center.
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