Cosmic ray variations, observed in September 1999
on CR station Moscow.
Fig. 1.
Variations of Moscow neutron monitor counting rate in September of 1999 (hourly
data).
Cosmic ray variations in September were moderate,
but monthly mean for this month was appeared to be as lowest for the last 5
years (cf. the last point on Fig. 2).
Fig. 2. Variations of Moscow neutron monitor counting rate from 1958 up to September 1999 (monthly data).
Cosmic ray decreases and other specific
effects were observed during of all
numerous magnetic storms of this month (on 12-13, 15-16, 22-23, 26-30), but the
big Forbush-effects were absent. The most interesting event was on 15th
of September (fig. 3). The big and sharp variations in this day are likely
related with enhanced and variable cosmic ray anisotropy.
The full list of cosmic
ray events.
Fig. 3. Variations of Moscow neutron monitor during 11-19 September 1999.
15th and 22nd were the most disturbed days of
month (Fig. 4).
Fig. 4.
Indices of cosmic ray activity (hourly and 24-hour running averaged),
calculated from Moscow neutron monitor
data.
Last revised 15 Oct, 1999.
Questions and remarks to Anatoly Belov.
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