Cosmic Ray Anisotropies Around the Forbush Decrease of April 11, 2001 |
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| Authors: | R P Kane |
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| Institution: | 1. Instituto Nacional de Pesquisas Espaciais (INPE), C. P. 515, 12245-970, S?o José dos Campos, SP, Brasil
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| Abstract: | During the Forbush decrease of April 11, 2001, the Ooty (11.4∘N, 76.7∘E, 2200 m altitude, South India) high energy muon detectors showed considerable anisotropies. Some anisotropies and asymmetries
indicated that the Earth did not pass the middle of the interplanetary structure (blob), and passed its northern part. Some
anisotropies which occurred when the Earth was outside the blob (notably before the Forbush decrease) could be the precursory
increases due to reflection from the shock fronts, but some others could not be understood as these appeared in a direction
away from the blob. |
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