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Detailed Reference Information |
Clem, J.M., Guzik, T.G., Lijowski, M., Wefel, J.P., Beatty, J.J., Ficenec, D.J., Tobias, S., Mitchell, J.W., McKee, S., Nutter, S., Tarle, G., Tomasch, A., Bower, C.R., Heinz, R.M., Mufson, S.L., Musser, J., Pitts, J., Spiczak, G.M., Ahlen, S.P. and Zhou, B. (1993). Balloon observations of galactic cosmic ray helium before and during a Forbush decrease. Geophysical Research Letters 20: doi: 10.1029/93GL01972. issn: 0094-8276. |
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The energy spectrum of galactic cosmic ray Helium was measured in two different balloon experiments launched four days apart from Canada: SMILI-I on 1-Sept-1989 and MASS on 5-Sept-1989. A slow Forbush decrease began on 4-Sept-1989 and had not reached its maximum at the time of the MASS flight. Comparison of the balloon measurements shows a fractional decrease of 0.37 to 0.15 in the Helium flux between 200 and 450 MeV/nucleon (1.2--2.0 GV). The rigidity dependence is analyzed in two models and found to be steeper than previous observations. Interplanetary particle data and ground-based Neutron Monitor results are consistent with the balloon observations. Probable sources for this Forbush decrease are discussed. ¿ American Geophysical Union 1993 |
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Abstract |
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Keywords
Interplanetary Physics, Cosmic rays, Solar Physics, Astrophysics, and Astronomy, Flares and mass ejections, Space Plasma Physics, Shock waves, Space Plasma Physics, Transport processes |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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