Energetic ion and cosmic ray characteristics of a magnetic cloudThe large interplanetary shock event of February 11, 1982, has yielded ISEE-3 energetic ion and magnetic field data as well as ground-based neutron-monitor cosmic-ray data. The timing and the onset of the Forbush decrease associated with this shock event coincide with the arrival at the earth of its magnetic cloud component; the duration of the decrease, similarly, corresponds to that of the cloud's passage past the earth. The large scattering mean free path readings suggest that while magnetic cloud ions can easily travel along magnetic field lines, they cannot travel across them, so that they cannot escape the cloud after entering it. Similarly, the cloud field lines prevented cosmic ray entrance, and could have prevented their reaching the earth. The cloud is therefore a major basis for the Forbush decrease.
Document ID
19920048627
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Sanderson, T. R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Beeck, J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Marsden, R. G. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Tranquille, C. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wenzel, K.-P. (ESTEC Noordwijk, Netherlands)
Mckibben, R. B. (Chicago, University IL, United States)