A Floor in the Open Flux IMF Strength Constant in Time (Centuries) and Space (Latitude)

Details A Floor in the Open Flux IMF Strength Constant in Time (Centuries) and Space (Latitude) A Floor in the Open Flux IMF Strength Constant in Time (Centuries) and Space (Latitude)

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh21a0313s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH21A-0313

Physics

2134 Interplanetary Magnetic Fields, 2169 Solar Wind Sources, 7513 Coronal Mass Ejections (2101), 7524 Magnetic Fields, 7536 Solar Activity Cycle (2162)

Scientific paper

The Interplanetary Magnetic Field (IMF) is with some success often modeled by assuming a spherical "source surface" near the sun where the magnetic potential is constant giving rise to the "open flux" of a radial IMF (eventually turning into a coned helix by solar rotation). 150 years of geomagnetic activity measurements suggest that the solar cycle variation of the IMF strength can be expressed as a constant component (Br ~ 3 nT at 1 AU near the Earth) plus a component that varies with the square root of the sunspot number (a proxy for the frequency of CMEs). There is growing evidence that CMEs represent "closed flux" with both footpoints in close proximity at the sun. If so, the remaining IMF (subtracting flux added by CMEs) varies little over the solar cycle. We suggest (and present evidence for) that the exists a "floor" in the IMF that is nearly constant over time (centuries) and space (latitude) reviving an old idea of Schulz et al. (1978) that the source surface might be thought of as a (prolate) surface of constant field strength. A consequence of this view is that the IMF strength does not depend on the solar polar fields.

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