Comparison of Doppler scintillation and in situ spacecraft plasma measurements of interplanetary disturbances

Details Comparison of Doppler scintillation and in situ spacecraft plasma measurements of interplanetary disturbances Comparison of Doppler scintillation and in situ spacecraft plasma measurements of interplanetary disturbances

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621227w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,227-21,244. Research supported by NASA.

Physics

20

Doppler Effect, Interplanetary Medium, Plasma Diagnostics, Shock Waves, Solar Limb, Solar Wind, Helios 1, Pioneer Venus Spacecraft, Satellite Observation, Scintillation

Scientific paper

Results are presented of detailed comparisons between Doppler scintillation and in situ plasma measurements to improve the understanding of Doppler scintillation transients. During a combined observing period of nearly 3 mo in 1981-1982 near solar maximum, 22 transients were observed by the Pioneer Venus Orbiter spacecraft and 23 shocks were observed by Helios 1. It is found that at least 84 percent of the transients are shocks, while at least 90 percent of the shocks are transients. Although the temporal profiles of Doppler scintillation and mass flux density are similar, the magnitudes of the Doppler scintillation transients may not simply reflect those of mass flux density. Only one pronounced solar wind event that was observed in the mass flux density measurements showed no signature in the scintillation data; field and particle measurements by Helios 1 suggest that it is a noncompressive density enhancement and/or a magnetic cloud. It is shown that Doppler scintillation measurements can now be used by themselves to detect and locate interplanetary shocks near the sun with a relatively high degree of certainty.

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