Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51b1679k&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH51B-1679
Physics
[2104] Interplanetary Physics / Cosmic Rays, [2134] Interplanetary Physics / Interplanetary Magnetic Fields
Scientific paper
The last long lasting Solar Minimum was unique in more ways than one. The heliospheric magnetic field (HMF) decreased to be the weakest ever recorded, while the heliospheric current sheet (HCS) dividing the two magnetic polarities remained moderately tilted quite until 2009. In 2009, the HCS flattened and GCR fluxes reached record level. We present a simple numerical model where we change the magnetic field strength and HCS tilt at the Sun, and passively propagate these changes into the heliosphere by the solar wind, generating corresponding temporal changes in the HMF, in the diffusion coefficients, and in the tilted HCS. We find that the increase of GCR intensity in 2009 may be associated with the flattening of the HCS. If so, our results suggest that particle drifts played dominant role in the transport of GCRs during this period.
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