A prototype muon detector network covering a full range of cosmic ray pitch angles

Details A prototype muon detector network covering a full range of cosmic ray pitch angles A prototype muon detector network covering a full range of cosmic ray pitch angles

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3494m&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

5

Scientific paper

We analyze the pitch angle distributions observed by a prototype muon detector network covering a full pitch angle range. The network includes a new muon detector installed at São Martinho in Brazil. Sample pitch angle distributions are obtained from preliminary analyses for periods including the Easter ground level enhancement (GLE) on April 15 and a large geomagnetic storm on March 31, 2001. It is confirmed in both sample distributions that the pitch angle coverage by the network is greatly improved by the new detector installed in Brazil. The pitch angle distribution also showed a systematic intensity excess from 0° pitch angle (sunward IMF) direction immediately after the onset of the Easter GLE, possibly indicating excess flux of high energy particles being accelerated by the flare and travelling along the IMF from the sun. No clear loss-cone precursor was found during a period preceding the geomagnetic storm on March 31, but the network observed instead intensity excesses around 0° pitch angle, half a day ahead the storm onset. We discuss these results taking account of the possible contribution from the atmospheric temperature effect. It is concluded that extension of the Brazilian detector in size is required for more precise and reliable observations.

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