Anomalous Forbush Effects Associated both with Remote Western and Eastern Sources

Details Anomalous Forbush Effects Associated both with Remote Western and Eastern Sources Anomalous Forbush Effects Associated both with Remote Western and Eastern Sources

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..424...81p&link_type=abstract

Proceedings of the 9th International Conference of the Hellenic Astronomical Society, proceedings of a conference held 20-24 Sep

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Solar wind disturbances near Earth, as a rule, dominate the magnitude, shape and other properties of Forbush effects. At specific cases though, an inconsistency in the relation between the characteristics of the interplanetary disturbance and Forbush effect is observed, when a large decrease of cosmic ray intensity may correspond to a small disturbance of the near Earth solar wind. Most often such cases occur when the source of disturbance is a large release of solar substation in the eastern part of the solar disk. The study of the Forbuch effect on 16-17 July 2005 has shown that an anomaly in the relation of the interplanetary magnetic field intensity and the Forbush effect magnitude may not be caused by eastern but by far western sources. We analyzed the events from the database of IZMIRAN, which contains several thousands interplanetary disturbances and Forbush effects in order to search for anomalous Forbush decreases associated with both remote western and eastern sources. Analysis of such events testifies that cosmic ray variations are able to provide information on sufficiently remote heliospheric phenomena and thus, play a significant role to the understanding of space environment.

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