Disappearance of the heliospheric sector structure at ULYSSES

Details Disappearance of the heliospheric sector structure at ULYSSES Disappearance of the heliospheric sector structure at ULYSSES

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2327s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 21, p. 2327-2330

Physics

93

Current Sheets, Heliosphere, Solar Magnetic Field, Solar Wind Velocity, Magnetic Poles, Mathematical Models, Neutral Sheets, Solar Cycles, Ulysses Mission

Scientific paper

In May, 1993, the heliospheric current sheet (HCS) ceased to be seen by the Ulysses spacecraft at a heliocentric latitude of approximately 30 deg S and distance of 4.7 AU. The disappearance of the HCS coincided with the solar wind speed remaining greater than 560 km/s and with the disappearance of one of four interaction regions previously seen on each solar rotation. The heliographic latitude of the disappearance of the HCS at Ulysses was 11 deg equatorward of the latitude of the magnetic neutral sheet computed at the source surface at 2.5 solar radii, and it occurred a half year earlier than predicted on the basis of the persistance of the time profile of the neutral sheet tilt from one solar cycle to the next.

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