[Kunow 1995 b]
Solar cycle modulation of cosmic ray electrons
H. Kunow.
Solar cycle modulation of cosmic ray electrons.
Advances in Space Research 16, (9)349. 1995
Contents
Solar modulation of nuclei has been observed and modeled for decades because
it is the key to our understanding of solar influence on the heliosphere.
Even with most advanced instruments and models the mechanism of solar
interference with cosmic ray particles is not yet fully understood.
Only few electron observations are available and they show a behavior which
differs from nuclei observations and seem to disagree with their interpretation.
The alternating sequence of peaked and flat-topped intensity maxima e. g.
observed for ions during three periods each eleven years apart at the time
of sunspot minima are generally attributed to drift effects in alternating
heliospheric magnetic fields.
A similar behavior shifted by eleven years would be expected for negatively
charged electrons.
Electron data seem not to confirm this.
The crucial test is approaching with the new solar minimum.
Fortunately, at the same time the ULYSSES spacecraft samples the polar regions
with both nucleon and electron instruments on board.
Results of the electron instruments will be presented and discussed in the
framework of present models.
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