Latitudinal Variation of the Underlying Heliospheric Magnetic Field Direction: Comparison of the Ulysses First and Second Orbits |
| |
Authors: | Forsyth RJ Balogh A Smith EJ |
| |
Institution: | (1) The Blackett Laboratory, Imperial College, London, SW7 2BW, U.K;(2) Jet Propulsion Laboratory, Pasadena, CA, 91109, U.S.A |
| |
Abstract: | We discuss the underlying direction of the heliospheric magnetic field measured by Ulysses in the latitude range 6° S-65° S by examining distributions of the magnetic field azimuthal angle with respect to the simple
Parker spiral model. During the first Ulysses traversal of this latitude range in 1992–1994, while solar activity was declining, the shape of the distributions obtained
at high latitudes in the fast solar wind differed from that at lower latitudes. In the present data set, obtained during rising
solar activity, both field polarities are present at all latitudes and the peaks of the distributions agree with the predicted
spiral direction to first approximation. However, compared to the first orbit, a significantly greater percentage of the observed
field vectors have large deviations from the spiral direction.
This revised version was published online in August 2006 with corrections to the Cover Date. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|