The evolution of the interplanetary sector structure in 1992

Details The evolution of the interplanetary sector structure in 1992 The evolution of the interplanetary sector structure in 1992

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2331b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 21, p. 2331-2334

Physics

36

Electron Energy, Interplanetary Magnetic Fields, Polarity, Shock Waves, Solar Corona, Solar Cycles, Magnetic Poles, Mapping, Solar Wind Velocity, Ulysses Mission

Scientific paper

The unique vantage point of the Ulysses spacecraft throughout 1992 and the beginning of 1993, at a close to constant heliocentric distance of about 5 AU and a slowly varying heliographic latitude from 5 deg to 30 deg south is used to describe and discuss the evolution of the sector structure of the interplanetary magnetic field during the declining phase of the solar cycle. From the end of 1990 to the beginning of 1992 the sector structure changed from a four sector to a two sector structure, but remained constant in solar longitude. From about June-July 1992, the structure, matching the evolution in the computed coronal magnetic fields, drifted eastwards, with a recurrence period of about 28 days. This result may indicate a slower rotation rate for the dipolar component of the solar magnetic field which becomes dominant about this time in the solar cycle.

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