[Bothmer 1995 a]
The Ulysses south polar pass:
Transient fluxes of energetic ions
V. Bothmer, R. G. Marsden, T. R. Sanderson,
K. J. Trattner, K.-P. Wenzel, A. Balogh,
R. J. Forsyth, and B. E. Goldstein.
The Ulysses south polar pass: Transient fluxes of energetic ions
Geophysical Research Letters 22, 3369-3372. 1995
Contents
Using Ulysses low energy telescope (LET) measurements of protons and
alpha particles with energies of ~1-5 MeV/n, we present first
observations of transient energetic particle events in the high latitude
heliosphere. Three transient particle events with gradual onsets and
time durations of several days have been identified in the LET data at
heliographic latitudes as hight as ~60° S, at radial distances from
the Sun between 3.3-3.6 AU. No transient increases were observed
polewards of 60° S. All three of the events were associated with a
passage of a coronal mass ejection (CME) over Ulysses, and two were
associated with the newly identified type of forward/reverse shock pairs
in the solar wind caused by over-expanding CMEs. The largest of the three
transient events has also been observed at Earth's orbit, i. e. in the
ecliptic. The observations show that energetic particles can be convected
into the high latitude heliosphere through CMEs.
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