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On the complex state of the interplanetary medium of 28-29 July 1977Observations of plasma and magnetic field variations in the near-Earth solar wind are discussed. Both a corotating stream and a driven shock are present. The driver gas seems to be enveloped in the rising speed phase of this stream; this appearance is attributed to a convoluted surface separating the two plasma domains. The magnetic field in the post shock flow (0030-1230 UT of July 29) has a large and geoeffective southward component at times; the energy coupling coefficient reaches approximately 5.4 x 10 to the 19th power ergs/s. In the driver gas (1230 UT of July 29 to 0110 of July 30) the magnetic field is dominantly northward. The density and dynamic pressure decrease by almost two orders of magnitude (100 to 2 cm/3) from just behind the interplanetary shock to approximately 3 hours into the driver gas flow. The dominant magnetic field variation in the driver gas is modeled by a cloud-like structure. Significant plasma parameter variations within the driver gas are attributed to structure in the parent solar mass ejection event and to interplanetary kinematics.
Document ID
19810012467
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
King, J. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lepping, R. P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sullivan, J. D. (MIT Cambridge, United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1981
Subject Category
Astrophysics
Report/Patent Number
NASA-TM-82095
Accession Number
81N20996
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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