Dayside observations of thermal-ion upwellings at 800-km altitude - An ionospheric signature of the cleft ion fountain

Details Dayside observations of thermal-ion upwellings at 800-km altitude - An ionospheric signature of the cleft ion fountain Dayside observations of thermal-ion upwellings at 800-km altitude - An ionospheric signature of the cleft ion fountain

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415277t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15277-15290.

Computer Science

Sound

53

Heavy Ions, Ion Injection, Ionospheric Ion Density, Polar Caps, Auroras, Daytime, Ion Distribution, Ionospheric Sounding, Oxygen Ions, Satellite Observation

Scientific paper

There is a growing body of evidence that energetic heavy ions observed at one or more earth radii over the polar cap originate from the dayside ionosphere in the vicinity of the dayside cleft. The ions, consisting mostly of O(+), are often characterized by conic pitch-angle distributions, suggesting that they have undergone acceleration transverse to geomagnetic field lines. This process of ion injection from a latitudinally localized source region in the dayside auroral oval followed by dispersal throughout the entire polar cap has been called the 'cleft ion fountain'. Here, results are presented of upward thermal-ion flows measured at 800-km altitude in the dayside polar ionosphere by the Hilat satellite. The characteristics of these thermal-ion upwellings (TIU) are described and shown to be closely associated with the cleft ion fountain. It is shown that TIU events are latitudinally confined and spatially collocated with cleft electron precipitation, upward field-aligned currents, and velocity gradients in magnetospheric convection.

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