Disappearance of the heliospheric sector structure at Ulysses

Journal Article · Fri Nov 05 00:00:00 EST 1993 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/93GL02632· OSTI ID:5468907

Smith, E J; Neugebauer, M; Goldstein, B E; Tsurutani, B T ^[1]; Balogh, A; Erdoes, G; Forsyth, R J ^[2]; Bame, S J; Phillips, J L ^[3]

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1. Jet Propulsion Lab, Pasadena, CA (United States)
2. Imperial College, London (United Kingdom)
3. Los Alamos National Laboratory, NM (United States)

In May, 1993, the heliospheric current sheet (HCS) ceased to be seen by the Ulysses spacecraft at a heliocentric latitude of [approximately]30[degrees]S and distance of 4.7 AU. The disappearance of the HCS coincided with the solar wind speed remaining >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[degrees] 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 persistence of the time profile of the neutral sheet tilt from one solar cycle to the next. 16 refs., 3 figs.

• OSTI ID: 5468907
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Vol. 20:21; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SUN
HELIOSPHERE
SOLAR ACTIVITY
SOLAR CYCLE
ATMOSPHERES
MAIN SEQUENCE STARS
SOLAR ATMOSPHERE
STARS
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)