Investigation of solar/heliospheric anomalies during the current solar cycle minimum

Details Investigation of solar/heliospheric anomalies during the current solar cycle minimum Investigation of solar/heliospheric anomalies during the current solar cycle minimum

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh11a1483w&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH11A-1483

Physics

[2134] Interplanetary Physics / Interplanetary Magnetic Fields, [2149] Interplanetary Physics / Mhd Waves And Turbulence, [2162] Interplanetary Physics / Solar Cycle Variations, [2164] Interplanetary Physics / Solar Wind Plasma

Scientific paper

The current unusually long solar cycle minimum has yielded a number of anomalies in solar and heliospheric phenomena, namely that the solar wind magnetic field is 36% weaker than that for the previous solar cycle minimum, the solar wind global pressure is the lowest observed since the dawn of the space age, the unusually high tilted angle of the solar dipole, and the absence of a classical quiescent equatorial streamer belt. Some observations seem to suggest that these solar extremes are associated with an inflated-heliospheric current/plasma sheet (HCS/HPS) manipulated by some unknown internal solar dynamics. The objectives of this study are to address questions associated with these anomalies and to test our understanding of the HCS/HPS inflation hypothesis. We employ both data analysis and numerical simulation to achieve our goals. Data sets will include in-situ plasma and field observations from WIND, ACE and the twin STEREO spacecraft and solar coronagraphs from SOHO/LASCO and STEREO/SECCHI. To assist in the interpretation of observational results, a global, three-dimensional, time-dependent, magnetohydrodynamic (MHD) numerical model is used to simulate the realistic heliosphere with actual solar inputs.

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