Remote Sensing of CMEs with Cosmic Rays

Details Remote Sensing of CMEs with Cosmic Rays Remote Sensing of CMEs with Cosmic Rays

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh41b0464m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH41B-0464

Physics

2104 Cosmic Rays, 2118 Energetic Particles, Solar, 7513 Coronal Mass Ejections, 7514 Energetic Particles (2114)

Scientific paper

A large geomagnetic storm and Forbush decrease often results when a CME-associated interplanetary shock impacts Earth. Recent observations and theories show that high-energy cosmic rays can have precursor anisotropies before the shock arrives at Earth. According to numerical modeling, charged particles which cross the IMF shock from downstream to upstream produce an intensity deficit in the small pitch angle region, and this ``loss cone'' anisotropy can exist ˜10% of an interplanetary scattering mean free path (λ ) ahead of the shock front. This implies that observing a wide pitch angle distribution of high-energy cosmic rays can provide us with advance warning of CMEs before their shocks impact Earth. We report a survey of ``loss cone'' anisotropies observed with the different λ (s) corresponding to neutron monitors and muon detectors which have responses to primary cosmic rays of ˜10 GeV and ˜ 30GeV respectively. The data we use are from the 11-station ``Spaceship Earth'' network of high-latitude neutron monitors and from the ground-based muon detector network during large geomagnetic disturbances (Kp>7) that occurred after ``Spaceship Earth'' became fully operational in late 2000. This work is supported in part by U.S. NSF grants ATM-0207196 and ATM-0000315 and in part by the joint research program of the Solar-Terrestrial Environment Laboratory, Nagoya University.

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