Observations in the sheath region ahead of a magnetic cloud and in the dayside magnetosheath during magnetic cloud passage

Details Observations in the sheath region ahead of a magnetic cloud and in the dayside magnetosheath during magnetic cloud passage Observations in the sheath region ahead of a magnetic cloud and in the dayside magnetosheath during magnetic cloud passage

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14..105f&link_type=abstract

Advances in Space Research, Volume 14, Issue 7, p. 105-110.

Astronomy and Astrophysics

Astronomy

16

Daytime, Electrons, Interplanetary Magnetic Fields, Magnetic Clouds, Magnetosheath, Plasma Density, Protons, Gas Dynamics, International Sun Earth Explorers, Magnetic Flux, Magnetohydrodynamic Stability, Satellite Observation, Solar Planetary Interactions, Spaceborne Astronomy

Scientific paper

We present magnetic field and particle (protons and electrons) observations in the sheath region behind an interplanetary shock driven by a magnetic cloud, and in the magnetic cloud itself. We also discuss observations in the dayside terrestrial magnetosheath during cloud passage. We find that the region ahead of the cloud is in pressure balance. Further, throughout its extent (greater than 0.06 AU), the magnetic field strength is anticorrelated with the plasma density, with the latter decreasing steadily as the cloud is approached. This behavior is indicative of magnetic forces influencing the flow topology and highlights a large-scale breakdown of predictions based solely on gas dynamical considerations. We also study density structures inside the cloud which result in an undulating dynamic pressure being applied to the magnetopause causing it to oscillate with amplitudes of approximately 1-3 Re and period approximately 2h.

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