Comparison of spherical double probe electric field measurements with plasma bulk flows in plasmas having densities less than 1 cm-3

Details Comparison of spherical double probe electric field measurements with plasma bulk flows in plasmas having densities less than 1 cm-3 Comparison of spherical double probe electric field measurements with plasma bulk flows in plasmas having densities less than 1 cm-3

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..737m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Aug. 1983, p. 737-740.

Statistics

16

Earth Magnetosphere, Electric Field Strength, Magnetohydrodynamic Flow, Plasma Density, Plasma Diagnostics, Plasma Probes, Correlation Coefficients, Electrical Measurement, International Sun Earth Explorer 1, International Sun Earth Explorer 2

Scientific paper

For a three-hour period in the magnetotail over which plasma density varied from less than 0.1 to about 1/cu cm, comparisons of ISEE-1 spherical double probe (dawn to dusk) electric field measurements and ISEE-2 plasma flows (converted to electric fields) show the zero lag cross correlation coefficient between 768 second averages of the two data sets to have been 0.93. A statistical relative uncertainty between pairs of points in the two data sets, estimated by only including counting statistics in the plasma measurement and time variations of the observed electric field over the measurement interval, is able to account for at least 75 percent of the deviations between the two data sets. In agreement with simple Langmuir probe theory, it has been found that the spacecraft potential measured over the three-hour interval by the double probe instrument varied as the log of the product of the plasma density and the square root of the electron temperature.

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