Observations of upstream ions and low‐frequency waves on ISEE 3
作者:
T. R. Sanderson,
R. Reinhard,
K.‐P. Wenzel,
E. C. Roelof,
E. J. Smith,
期刊:
Journal of Geophysical Research: Space Physics
(WILEY Available online 1983)
卷期:
Volume 88,
issue A1
页码: 85-95
ISSN:0148-0227
年代: 1983
DOI:10.1029/JA088iA01p00085
数据来源: WILEY
摘要:
We present three examples of correlated observations of 35‐ to 1600‐keV upstream ions and low‐frequency waves measured on ISEE 3, located between ∼76 and ∼200REfrom the earth's bow shock. The observations show that when no upstream waves are present, the particle anisotropies are beamlike, aligned along the magnetic field after transformation into the
drift velocity reference frame. When waves are present, the pitch angle distributions are broadened, the amount of broadening being correlated with the amount of wave activity. These waves are transverse, circularly polarized, and have a period of ∼30 s. From our observations we conclude that during long‐lasting events an equilibrium is reached where the region between the spacecraft and the bow shock contains a significant amount of low‐frequency wave activity, together with significant pitch angle scattering. The amount of scattering decreases with upstream distance, ranging from strong scattering at the bow shock to weak scatt
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