Heliomagnetic latitude dependence of the heliospheric magnetic field

Details Heliomagnetic latitude dependence of the heliospheric magnetic field Heliomagnetic latitude dependence of the heliospheric magnetic field

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...93b&link_type=abstract

International Solar Wind 8 Conference, p. 93

Astronomy and Astrophysics

Astronomy

Heliosphere, Interplanetary Magnetic Fields, Solar Activity Effects, Solar Cycles, Solar Magnetic Field, Astronomical Observatories, Astronomical Models, Explorer 50 Satellite, Ulysses Mission, Astronomical Satellites

Scientific paper

Previous studies have revealed systematic variations of the interplanetary magnetic field with heliographic latitude. Luhmann et al. (1987) modeled Pioneer Venus (PVO) and ISEE-3 observations by assuming an asymmetric dependence on heliolatitude with stronger fields in the northern hemisphere. In a subsequent study, using data from ISEE-3/ICE and IMP-8, Burton et al. (1990) found evidence for a similar asymmetry. However, neither model has been completely successful. The model derived from PVO/ICE observations agrees quite well near solar maximum but shows significant discrepancies during the descending phase of the solar cycle. The model derived from the ICE/IMP-8 comparison suffers from significant phase delays between the difference in field magnitude at the two spacecraft and their latitude difference. In an attempt to account for these phase shifts, the IMP-8 and ICE data have been reexamined in heliomagnetic coordinates which are defined by the orientation of the solar magnetic dipole. The latitude and longitude of the dipole inferred from the data have then been compared with those implicit in source surface calculations. The IMP/ICE correlations have been extended into the recent solar maximum and descending phase. Comparisons have also been carried out between IMP-8 and Ulysses as it traveled to -30 deg south heliographic latitude.

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