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Magnetic clouds, geomagnetic disturbances, and cosmic ray decreases

Journal Article · · J. Geophys. Res.; (United States)
;
Nineteen magnetic clouds are identified in the years from 1978 through 1982 and studied using superposed epoch analysis. The magnetic field intensity, proton density, and proton temperature are enhanced ahead of magnetic clouds that are preceded by a shock, while strong magnetic field intensity and low proton temperature are observed within the clouds. A relatively large (approx.2.5%) decrease in cosmic ray intensity is associated with mgnetic clouds that are preceded by a shock, perhaps caused by the turbulent sheath behind an interplanetary shock ahead of the magnetic cloud, whereas only a small (approx.0.5%) decrease in intensity is associated with the magnetic cloud itself. Magnetic clouds can produce geomagnetic activity with a decrease in Dst index of the order of 100 ..gamma... The magnitude of the change in the Dst index for the case when southward fields arrive first is comparable to that for the case when northward fields arrive first, and the phase is such that geomagnetic activity is associated with southward fields. copyright American Geophysical Union 1988
Research Organization:
Department of Mechanical Engineering, Catholic University of America, Washington, D.C.
OSTI ID:
5229230
Journal Information:
J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 93:A4; ISSN JGREA
Country of Publication:
United States
Language:
English

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Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
CORONA DISCHARGES
COSMIC PROTONS
COSMIC RADIATION
COSMIC RAY FLUX
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRIC DISCHARGES
ELEMENTARY PARTICLES
FERMIONS
GEOMAGNETIC FIELD
HADRONS
IONIZING RADIATIONS
MAGNETIC FIELDS
MAGNETIC STORMS
NUCLEONS
PLASMA SHEATH
PROTONS
RADIATION FLUX
RADIATIONS
SHOCK WAVES
SOLAR ACTIVITY
SOLAR WIND