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Titolo:
Scales of heliospheric current sheet coherence between 1 and 5 AU
Autore:
Crooker, NU; Kahler, SW; Gosling, JT; Larson, DE; Lepping, RP; Smith, EJ; De Keyser, J;
Indirizzi:
Boston Univ, Ctr Space Phys, Boston, MA 02215 USA Boston Univ Boston MA USA 02215 niv, Ctr Space Phys, Boston, MA 02215 USA Hanscom Air Force Base, Space Vehicles Directorate, Air Force Res Lab, Bedford, MA 01731 USA Hanscom Air Force Base Bedford MA USA 01731 es Lab, Bedford, MA 01731 USA Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA Univ Calif Los Alamos Natl Lab Los Alamos NM USA 87545 amos, NM 87545 USA NASA, Goddard Space Flight Ctr, Extraterr Phys Lab, Greenbelt, MD 20771 USA NASA Greenbelt MD USA 20771 , Extraterr Phys Lab, Greenbelt, MD 20771 USA CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA CALTECH Pasadena CA USA 91109 LTECH, Jet Prop Lab, Pasadena, CA 91109 USA Belgian Inst Space Aeron, Brussels, Belgium Belgian Inst Space Aeron Brussels Belgium pace Aeron, Brussels, Belgium
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A8, volume: 106, anno: 2001,
pagine: 15963 - 15971
SICI:
0148-0227(20010801)106:A8<15963:SOHCSC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORONAL MASS EJECTIONS; PLANETARY SECTOR BOUNDARIES; SOLAR-WIND; STREAMER; POLARITIES; EVOLUTION; ELECTRONS; SURFACE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Crooker, NU Boston Univ, Ctr Space Phys, 725 Commonwealth Ave, Boston, MA 02215 USA Boston Univ 725 Commonwealth Ave Boston MA USA 02215 02215 USA
Citazione:
N.U. Crooker et al., "Scales of heliospheric current sheet coherence between 1 and 5 AU", J GEO R-S P, 106(A8), 2001, pp. 15963-15971

Abstract

The structure of the heliospheric current sheet (HCS) at Ulysses and at Wind is compared during the period of near-radial alignment in 1998. Electronheat flux and magnetic field data are used to determine true magnetic field polarity. During the solar rotation period surrounding alignment there was considerable disagreement between the HCS crossings at Wind and those predicted from the corresponding source surface map, both in number and in location, consistent with the disordered, temporally varying solar wind at this ascending phase of the solar cycle. Despite this complexity the four crossings closest to the time of radial alignment at Wind were successfully identified in Ulysses data with use of a one-dimensional hydrodynamic code. Further, minimum variance analysis for the first two crossings, which were separated by only 16 hours at Wind, indicated coherent propagation of a large-scale warp in the HCS. Analysis of the local structure of the HCS on the four crossings, however, revealed a high level of variability both from caseto case and from one spacecraft to the other. For example, the third crossing at Wind was a single-sheet crossing adjacent to structures with fields folded back on themselves and a brief period of counterstreaming electrons implying a transient structure. At Ulysses multiple sheets were encountered. At the fourth crossings Wind passed through a counterstreaming event witha flux rope signature containing a south pointing axis, while Ulysses passed through a flux tube with little field rotation and northward pointing field. The results are consistent with the view that the heliospheric currentsheet is coherent as a global structure but highly variable in local structure over angular distances of a few degrees.

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Documento generato il 05/07/20 alle ore 12:25:42