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Title: Large-scale plasma-density fluctuations measured with the HILAT satellite at 830-km altitude. Technical report

Abstract

Measurements from the plasma monitor on the HILAT satellite were used to map the distribution of large-scale fluctuations in the density of plasma at high latitudes. Digital filtering was used to separate the original data into three frequency bands. The output from the middle band pass filter was used to count and map the distribution of large-scale plasma density enhancements. Maps of blob distribution are drawn as a function of magnetic local time and invariant latitude, for both low and high magnetic activity. To serve as a point of reference the same filtering and counting techniques are applied to measurements of the ion-drift velocity to show the distribution of electric-field fluctuations. Additionally, from the power levels measured at two different frequencies, the average spectral slopes of both the plasma density and electric field were mapped. The results show that large-scale plasma enhancements are created in the auroral zone and are transported away from the production regions by convection. Movement of blobs from the cusp to polar cap is very prominent. The spectral slope of the plasma density is significantly increased in the night side, from 23 to 2 hour magnetic local time. The intermediate-scale plasma irregularities appear to be dissipatedmore » in this region. Enhanced radio scintillations were measured with the HILAT radio beacon in the same locations.« less

Authors:
Publication Date:
Research Org.:
Regis Coll., Weston, MA (USA). Research Center
OSTI Identifier:
6012227
Report Number(s):
AD-A-183043/9/XAB; SCIENTIFIC-2
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AURORAL ZONES; ION DRIFT; IONOSPHERE; PLASMA DENSITY; POLAR-CAP AURORAE; CONVECTION; DIGITAL FILTERS; ELECTRIC FIELDS; MAGNETIC FIELDS; MONITORING; POLAR CUSP; PRODUCTION; SPECTRA; VARIATIONS; VELOCITY; AURORAE; EARTH ATMOSPHERE; ENERGY TRANSFER; HEAT TRANSFER; MASS TRANSFER; PLANETARY IONOSPHERES; 640201* - Atmospheric Physics- Auroral, Ionospheric, & Magetospheric Phenomena

Citation Formats

Weimer, D R. Large-scale plasma-density fluctuations measured with the HILAT satellite at 830-km altitude. Technical report. United States: N. p., 1987. Web.
Weimer, D R. Large-scale plasma-density fluctuations measured with the HILAT satellite at 830-km altitude. Technical report. United States.
Weimer, D R. Wed . "Large-scale plasma-density fluctuations measured with the HILAT satellite at 830-km altitude. Technical report". United States.
@article{osti_6012227,
title = {Large-scale plasma-density fluctuations measured with the HILAT satellite at 830-km altitude. Technical report},
author = {Weimer, D R},
abstractNote = {Measurements from the plasma monitor on the HILAT satellite were used to map the distribution of large-scale fluctuations in the density of plasma at high latitudes. Digital filtering was used to separate the original data into three frequency bands. The output from the middle band pass filter was used to count and map the distribution of large-scale plasma density enhancements. Maps of blob distribution are drawn as a function of magnetic local time and invariant latitude, for both low and high magnetic activity. To serve as a point of reference the same filtering and counting techniques are applied to measurements of the ion-drift velocity to show the distribution of electric-field fluctuations. Additionally, from the power levels measured at two different frequencies, the average spectral slopes of both the plasma density and electric field were mapped. The results show that large-scale plasma enhancements are created in the auroral zone and are transported away from the production regions by convection. Movement of blobs from the cusp to polar cap is very prominent. The spectral slope of the plasma density is significantly increased in the night side, from 23 to 2 hour magnetic local time. The intermediate-scale plasma irregularities appear to be dissipated in this region. Enhanced radio scintillations were measured with the HILAT radio beacon in the same locations.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {4}
}

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