Other
Scientific paper
Nov 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969p%26ss...17.1879h&link_type=abstract
Planetary and Space Science, Volume 17, Issue 11, p. 1879-1889.
Other
24
Scientific paper
The occurrence of an unusual class of large amplitude wave trains in the cosmic ray neutron intensity, which is distinctly different from the average diurnal variation as well as from other recognised types of large amplitude diurnal variations, is noted and the directional distribution in interplanetary space determined by the analysis of data from a number of `high latitude' neutron monitors. The chief characteristic of the two sequences of wave trains described herein is a marked intensity depression along a cone of directions (semi-angle about 40°) with its axis directed along the average sunward direction of the interplanetary magnetic field (45° west of the Earth-Sun line). The similarity of the phenomenon to the pre-decreases seen at times prior to the on-set phase of some Forbush decreases is pointed out. However, the question as to whether the effect is connected with flare-initiated Forbush decrease mechanisms which fail to envelope the Earth or with recurrent (co-rotating) Forbush decreases has to remain open at present.
Hashim A.
Thambyahpillai T.
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