Heliospheric tomography using interplanetary scintillation observations. III - Correlation between speed and electron density fluctuations in the solar wind

Details Heliospheric tomography using interplanetary scintillation observations. III - Correlation between speed and electron density fluctuations in the solar wind Heliospheric tomography using interplanetary scintillation observations. III - Correlation between speed and electron density fluctuations in the solar wind

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.1991a&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 1991

Physics

40

Heliosphere, Solar Wind Velocity, Computer Aided Tomography, Electron Density Profiles, Interplanetary Medium, Solar Activity, Data Correlation, Scintillation, Line Of Sight, Density Distribution, High Speed

Scientific paper

We examine the relationship between solar wind speed and electron density fluctuations on scale sizes around 100 km in the heliocentric distance range of 0.3 to 0.8 AU using interplanetary scintillation data obtained at the Solar-Terrestrial Environment Laboratory. The solar wind properties derived from the IPS data are biased by line of sight integration through a 3D structured solar wind. Therefore, we apply a computer-assisted tomography (CAT) method to deconvolve the line-of-sight integration and reconstruct the solar wind structure. The analysis was made for the solar wind speed V and electron density fluctuations delta-Ne in the solar activity minimum phase when high-speed regions are separated from an equatorial low-speed region by a sharp velocity gradient. From results of the CAT analysis we derived the best fit power law relation of delta-Ne varies as V exp -gamma with gamma = 0.5 +/- 0.15, indicating that fractional density fluctuations delta-Ne/Ne in the high-speed wind are larger than those in the low-speed wind. We suggest that the fractional density fluctuation level of the high-speed wind evolves with heliocentric distance.

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