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Record 7 of 422
Ulysses observations of latitude gradients in the heliospheric magnetic field
External Online Source: doi:10.1016/0273-1177(95)00328-C
Author and Affiliation:
Smith, E. J.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, US, United States)
Balogh, A.(Imperial College, London, D, UK, United States)
Lepping, R. P.(Goddard Space Flight Center, Greenbelt, MD, US, United States)
Neugebauer, M.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, US, United States)
Phillips, J.(Los Alamos National Lab., Los Alamos, NM, US, United States)
Tsurutani, B. T.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, US, United States)
Abstract: Several parameters measured by Ulysses as it traveled southward to heliographic latitudes of -50 deg are presented and analyzed. The radial component of the magnetic field, averaged over 5 deg latitude increments and extrapolated back to 1 AU, is found to agree with baseline measurements provided by IMP-8. There is little, if any, evidence of a latitude gradient, a result consistent with the dominance of the magnetic field associated with the heliospheric current sheet and with recent models which include the effect of the current sheet as well as of source surface fields. Thus far, the spiral angle agrees with the Parker spiral assuming a rate of rotation of the field lines at the Sun equal to the equatorial value. No evidence is seen of either a change in rotation rate with latitude or an unwinding of the spiral as suggested by a recent analysis. Hourly variances in the field magnitude and in the sum of the variances in the components, normalized to the square of the observed field strenght, show the former to be independent of latitude while the latter shows a strong increase with latitude. These two observations are shown to be associated with Alfven waves that are continuously present at high latitudes. The waves have large amplitudes, extend to long periods, and have important implications for galactic cosmic rays and the solar wind.
Publication Date: Jan 01, 1995
Document ID:
19950052993
(Acquired Dec 28, 1995)
Accession Number: 95A84592
Subject Category: SOLAR PHYSICS
Document Type: Journal Article
Publication Information: SEE A95-84573; Advances in Space Research; p. p. (9)165-(9)170; (ISSN 0273-1177); 16; 9
Publisher Information: United Kingdom
Financial Sponsor: NASA; United States
Organization Source: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
NASA; Washington, DC, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: HELIOSPHERE; LATITUDE; SOLAR MAGNETIC FIELD; SOLAR ROTATION; ULYSSES MISSION; CURRENT SHEETS; EXPLORER 50 SATELLITE; GALACTIC COSMIC RAYS; MAGNETIC FLUX; MAGNETOHYDRODYNAMIC WAVES; SOLAR WIND
Imprint And Other Notes: The heliosphere during the declining solar cycle; Symposium D1.1 of COSPAR Scientific Assembly, 30th, Hamburg, Germany, July 11-21, 1994 . A95-84573, p. (9)165-(9)170
Miscellaneous Notes: Research sponsored by the Jet Propulsion Lab., California Inst. of Tech., and the U.S. Dept. of Energy
Availability Source: Other Sources
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