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Science 19 May 1995:
Vol. 268. no. 5213, pp. 1026 - 1029
DOI: 10.1126/science.268.5213.1026
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Articles

Ulysses Radio and Plasma Wave Observations at High Southern Heliographic Latitudes

R. G. Stone 1, R. J. MacDowall 1, J. Fainberg 1, M. L. Kaiser 1, M. D. Desch 1, M. L. Goldstein 1, S. Hoang 2, J. L. Bougeret 2, C. C. Harvey 2, R. Manning 2, J. L. Steinberg 2, P. J. Kellogg 3, N. Lin 3, K. Goetz 3, V. A. Osherovich 4, M. J. Reiner 4, P. Canu 5, N. Cornilleau-Wehrlin 5, D. Lengyel-Frey 6, and G. Thejappa 6

1 National Aeronautics and Space Administration (NASA), Goddard Space Flight Center, Greenbelt, MD 20771, USA.
2 Observatoire de Paris-Meudon, 92195 Meudon Principal Cedex, France
3 School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA.
4 Hughes STX, Lanham, MD 20706, USA.
5 Centre des Etudes Terrestres et Planetaires, 78140 Velizy, France
6 Department of Astronomy, University of Maryland, College Park, MD 20742, USA.

Ulysses spacecraft radio and plasma wave observations indicate that some variations in the intensity and occurrence rate of electric and magnetic wave events are functions of heliographic latitude, distance from the sun, and phase of the solar cycle. At high heliographic latitudes, solartype Ill radio emissions did not descend to the local plasma frequency, in contrast to the emission frequencies of some bursts observed in the ecliptic. Short-duration bursts of electrostatic and electromagnetic waves were often found in association with depressions in magnetic field amplitude, known as magnetic holes. Extensive wave activity observed in magnetic clouds may exist because of unusually large electron-ion temperature ratios. The lower number of intense in situ wave events at high latitudes was likely due to the decreased variability of the high- latitude solar wind.

Submitted on February 2, 1995
Accepted on April 20, 1995


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Large-Scale Interplanetary Magnetic Field Configuration Revealed by Solar Radio Bursts.
M. J. Reiner, J. Fainberg, and R. G. Stone (1995)
Science 270, 461-464
   Abstract »    PDF »
The Heliospheric Magnetic Field Over the South Polar Region of the Sun.
A. Balogh, D. J. Southwood, R. J. Forsyth, T. S. Horbury, E. J. Smith, and B. T. Tsurutani (1995)
Science 268, 1007-1010
   Abstract »    PDF »


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