Statistics – Computation
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003adspr..32..657f&link_type=abstract
Advances in Space Research, Volume 32, Issue 4, p. 657-662.
Statistics
Computation
10
Scientific paper
The `tilt angle' of the wavy current sheet in the hehosphere has been used very successfully as a proxy for solar activity in cosmic ray (CR) modulation models with particle drifts included. The ``Hoeksema tilt angles α'' are calculated using two potential field methods: (1) The classic `line-of-sight' computation and (2) the more recent `radial' photospheric field computation. The question of which set of `tilt angles' is the more appropriate to use in modulation models is addressed by utilizing them in a comprehensive time-dependent drift model applied to the 22-year modulation cycle of 1.2 GeV cosmic ray electrons. We found that the `classic' α are better suited than the `new' α as a proxy for solar activity for periods of decreasing α and vice versa for periods of increasing α. By comparing the model with data it was shown that the set of α with the smallest rate of change over a period of decreasing or increasing solar activity provides the best compatibility with CR observations.
Ferreira Stefan E. S.
Potgieter Marius S.
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