Computer Science – Sound
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9107f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Oct. 1, 1984, p. 9107-9113.
Computer Science
Sound
45
Convective Flow, Ionospheric Sounding, Magnetohydrodynamic Flow, Space Plasmas, Arctic Regions, Daytime, Incoherent Scatter Radar, Ionospheric Propagation, Radio Probing
Scientific paper
A summary of multiposition observations of the pattern of ionospheric convection equatorward of the noontime cleft made with the Chatanika incoherent scatter radar before 1982 is presented. Data were gathered between 57-73 deg N in both quiescent and disturbed conditions. The undisturbed ionosphere data were taken when the IMF was directed toward the sun and featured a poleward 300 m/sec plasma flow. Vector velocities were not available in perturbed conditions. The cleft moved to a lower latitude during solar maximum and exhibited a convergence region near the noon meridian below 70 deg N, a region of moderate speed poleward flow, and flow divergence from the noon cleft at the highest latitudes. The eastward electric field was 25 mV/m when the geomagnetic index exceeded a value of 4. The radar facility has been moved to Sondre Stromfjord, Greenland, and is now closer to the cleft.
Doupnik Joe R.
Foster Christopher J.
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