Spread F plasma bubble vertical rise velocities determined from spaced ionosonde observations

Details Spread F plasma bubble vertical rise velocities determined from spaced ionosonde observations Spread F plasma bubble vertical rise velocities determined from spaced ionosonde observations

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9197a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 9197-9204. Sponsorship: Fundo Nacional de Desenvolvi

Computer Science

Sound

21

Equatorial Atmosphere, Ionospheric Drift, Plasma Bubbles, Space Plasmas, Spread F, Geomagnetism, Ionograms, Ionospheric Sounding, Magnetic Equator, Night Sky, Temporal Distribution, Velocity Measurement, Vertical Motion

Scientific paper

Systematic time differences in the onsets of spread-F events in ionograms are observed between the magnetic equatorial station Fortaleza (4 deg S, 38 deg W, dip latitude 1.8 deg S) and the low-latitude station Cachoeira Paulista (23 deg S, 45 deg W, dip latitude 14 deg S), two stations in Brazil located at close-by magnetic meridional planes (actually some 12 deg of magnetic longitude apart). On the assumption, justified from different experimental observations, that the spread-F irregularities occur in strongly field-aligned plasma bubbles that extend several degrees on either side of the magnetic equator and rise up in vertically elongated columns over the magnetic equator, the observed time differences in the onsets of spread-F events at the two stations are related to the plasma-bubble vertical-rise velocities over the magnetic equator. The vertical-rise velocities are found to be well within the values measured by VHF radar and satellite techniques, and further show, at times, good correlations with the amplitude of the prereversal peak in the vertical-drift velocities and the heights of the evening equatorial F layer. Possible implications of these results are discussed.

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