Magnetospheric cut-off rigidity variations recorded by Neutron Monitors during the events of 8 and 10 November 2004

Details Magnetospheric cut-off rigidity variations recorded by Neutron Monitors during the events of 8 and 10 November 2004 Magnetospheric cut-off rigidity variations recorded by Neutron Monitors during the events of 8 and 10 November 2004

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf...11m&link_type=abstract

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io

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During a geomagnetic storm, characteristic variations of cosmic ray intensity recorded by the worldwide network of neutron monitor stations are observed. More specifically, a characteristic increase of Cosmic Ray intensity is observed mainly in the middle latitude stations, due to the geomagnetic cut-off rigidity changes. Athens neutron monitor is considered as one of the most suitable worldwide for observing this kind of phenomena. During the time period 2000-2010 about 7 geomagnetic effects were observed with the most significant being the one on November of 2003, which is considered as the largest magnetic storm in the history of neutron monitors. The contribution of middle latitude stations in the prediction and observation of such effects is significant. In this work the magnetic storms at 8 and 10 November 2004 are analyzed using data from Athens Neutron Monitor and other stations from the worldwide Neutron Monitors network as well. The variations of the cosmic ray intensity were studied with respect to the geomagnetic indices Dst and Kp and using the global spectrographic survey method (GSM) the changes of the geomagnetic cut-off rigidities during these events were calculated. From our analysis it was shown that the maximum cut-off rigidity changes were observed at the range around 6.5-9 GV. This corresponds to unusually low latitudes for maximal effect. The largest effect of the examined events was the one at 8th November 2004, best observed at the Athens (37.58°N, 23.47°E, 8.53GV) and Potchefstroom (-26.68°S, 27.10°E, 7.0 GV) neutron monitors.

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