Physics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...95h&link_type=abstract
International Solar Wind 8 Conference, p. 95
Physics
Solar Wind, Solar Corona, Heliosphere, Sun, Plasma Density, Density Distribution, Velocity Distribution, Scintillation, Doppler Radar, Periodic Variations, Solar Physics, International Sun Earth Explorer 3, Stellar Mass Ejection, Wind Velocity Measurement, Coronal Holes, Current Sheets, Time Series Analysis, Solar Planetary Interactions
Scientific paper
Density fluctuations with periods 10 minutes to 1 hour have been investigated in ISEE 3 plasma measurements of solar wind flows at l AU. Coronal hole, interstream, plasma sheet, coronal mass ejection, and interaction region flow types are considered. The ISEE 3 results support the interpretation of the large-scale variations in density fluctuations observed by Doppler scintillation measurement techniques inside 0.2 AU. The highest absolute and relative density fluctuations occur ahead of and within the plasma from coronal mass ejections, with the maximum values occurring between the associated interplanetary shocks and the driver gas. For the quasi-stationary solar wind, density and relative density fluctuations are highest around the heliospheric current sheet and lowest in the high-speed coronal flow. Superposed epoch analysis shows that the region of enhanced density fluctuations and its abrupt boundaries observed in the vicinity of the heliospheric current sheet near the Sun persists to l AU, providing further support for the filamentary nature of the extensions of coronal streamers. The results of this study confirm the advantages of using density fluctuations rather than density as a tracer of solar wind flows with differing origins at the Sun and as a detector of propagating interplanetary disturbances.
Huddleston D. E.
Neugebauer Matthias
Woo Richard
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