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Utah State University

Physics Student Research

Models coronal mass ejections

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Using The Wsa Model To Test The Parker Spiral Approximation For Sep Event Magnetic Connections, S. W. Kahler, C. N. Arge, David Alan Smith Jan 2016

Using The Wsa Model To Test The Parker Spiral Approximation For Sep Event Magnetic Connections, S. W. Kahler, C. N. Arge, David Alan Smith

Physics Student Research

In studies of solar energetic (E > 10 MeV) particle (SEP) events the Parker spiral (PS) field approximation, based only on the measured 1 AU solar wind (SW) speed Vsw, is nearly always used to determine the coronal or photospheric source locations of the 1 AU magnetic fields. There is no objective way to validate that approximation, but here we seek guidelines for optimizing its application. We first review recent SEP studies showing the extensive use of the PS approximation with various assumptions about coronal and photospheric source fields. We then run the Wang-Sheeley-Arge (WSA) model over selected Carrington rotations (CRs ...