A global 2.5-dimensional three fluid solar wind model with alpha particles

Journal of Geophysical Research: Space Physics

Volumn 111, Issue 8, 2006, Pages

  Li, Bo ^a   Li, Xing ^a   Labrosse, Nicolas ^a  

^a ABERYSTWYTH UNIVERSITY   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 33947587610     PISSN: None     EISSN: 21699402     Source Type: Journal    
DOI: 10.1029/2005JA011303     Document Type: Article

References (58)

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58. 1.0 spectrum of galactic H at low energies. The modulation between 1998 and 2002 produced intensity changes of galactic H similar to those observed at the Earth in the same time period except that the changes at V1 and V2 were much smaller. The intensity change at V2 was also larger than that at V1. For anomalous H, however, the intensity changes at V1 and V2 were a factor of 10-20 times larger than those for galactic H, so that by the end of 2001 the anomalous H intensities were less than 1% of their 1998 values. Also, during one time period in late 2001 there was a large reduction of anomalous H at both V1 and V2 with no corresponding change in galactic H. These different intensity changes between galactic and anomalous H provide an insight into particle transport, drift, and acceleration processes in the region near the heliospheric termination shock, which is located just beyond V1. Radial gradient comparisons in 1998 and also at the times of reduced anomalous H intensities imply that most of the intensity reduction of anomalous H apparently occurred at ∼90 AU or beyond. This could indicate source changes in the anomalous H spectra but most likely is a measure of changes in the "connection" between V1 and V2 and the source region, such as might be caused by changing drift patterns and particle entry into the heliosphere. Copyright 2006 by the American Geophysical Union.