Solar Implications of ULYSSES Interplanetary Field Measurements

Details Solar Implications of ULYSSES Interplanetary Field Measurements Solar Implications of ULYSSES Interplanetary Field Measurements

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447l.143w&link_type=abstract

Astrophysical Journal Letters v.447, p.L143

Astronomy and Astrophysics

Astronomy

128

Interplanetary Medium, Sun: Corona, Sun: Magnetic Fields, Sun: Solar Wind

Scientific paper

Recent observations by the Ulysses magnetometer team have shown that the strength of the radial interplanetary field component, |Br| , is essentially independent of latitude, a result which implies that the heliospheric currents are confined entirely to thin sheets. Using such a current sheet model, we extrapolate the observed photospheric field to 1 AU and compare the predicted magnitude and sign of Br with spacecraft measurements during 1970--1993. Approximate agreement can be obtained if the solar magnetograph measurements in the Fe I lambda 5250 line are scaled upward by a latitude-dependent factor, similar to that derived by Ulrich from a study of magnetic saturation effects. The correction factor implies sharply peaked polar fields near sunspot minimum, with each polar coronal hole having a mean field strength of 10 G.

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