Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009soph..256..345l&link_type=abstract
Solar Physics, Volume 256, Issue 1-2, pp. 345-363
Physics
20
Stereo Mission, Solar Wind, Solar Cycle, Models, Solar Cycle, Observations, Magnetic Fields, Observations, Magnetic Fields, Interplanetary
Scientific paper
The current solar cycle minimum seems to have unusual properties that appear to be related to weak solar polar magnetic fields. We investigate signatures of this unusual polar field in the ecliptic near-Earth interplanetary magnetic field (IMF) for the STEREO period of observations. Using 1 AU OMNI data, we find that for the current solar cycle declining phase to minimum period the peak of the distribution for the values of the ecliptic IMF magnitude is lower compared to a similar phase of the previous solar cycle. We investigate the sources of these weak fields. Our results suggest that they are related to the solar wind stream structure, which is enhanced by the weak polar fields. The direct role of the solar field is therefore complicated by this effect, which redistributes the solar magnetic flux at 1 AU nonuniformly at low to mid heliolatitudes.
Arge Charles Nickolos
de Pater Imke
Lee Chong OH
Liu Ya-Ying
Luhmann Janet G.
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