Changes of geomagnetic transmissivity in the disturbed magnetosphere: ground-based and CORONAS-F observations |
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Authors: | S N Kuznetsov B Y Yushkov J Kaššovicová K Kudela R Bučík |
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Institution: | (1) Institute of Nuclear Physics, Moscow State University, Vorob’evy Gory, 119889 Moscow, Russia;(2) Faculty of Engineering and Informatics, Technical University of Košice, Park Komenskeho 2, 04001 Košice, Slovakia;(3) Institute of Experimental Physics, Slovak Acad. Sci., Watsonova 47, 04001 Košice, Slovakia |
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Abstract: | We report increases of cosmic-ray intensity at lowL shells, on the ground as well as on the altitude of 500 km, during the selected intervals when magnetosphere was strongly
disturbed. The geomagnetic transmissivity for cosmic ray vertical access has been computed for four events, using two geomagnetic
field models. The first event, namely, dated November 20–22, 2003, led to an increase of galactic cosmic-ray intensity due
to the improvement of magnetospheric transmissivity at neutron monitors with high nominal cut-off rigidity. Other two events
with high-energy solar proton emissions, namely, dated October 28 and November 2, 2003, caused different responses at middle
latitudes. The first one followed by the strong geomagnetic disturbance led to the shift of the penetration boundary of protons,
having(50–90) MeV at CORONAS-F satellite toL<3, coinciding approximately with the cut-off reduction expected byDst depression, while the other one, without remarkableDst decrease, did not shift the outer boundary of penetration belowL ≈ 4. And the fourth of the events, on November 8, 2004, with strong geomagnetic disturbance, yielded a complicated structure
of cosmic-ray time profiles: superimposed on the cosmic-ray decrease, viewed by neutron monitors and by CORONAS-F at high
latitude; an increase of intensity at middle latitudes both on the ground and on the altitude of 500 km has been observed
during theDst depression.
This work was supported by the Slovak Research and Development Agency under the contract No. APVV-51-053805. The work at Technical
University was supported by VEGA grant 2/4064. |
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Keywords: | 94 20 wq |
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