Wave activity, F1-layer disturbance and a sporadic E-layer over EISCAT

Details Wave activity, F1-layer disturbance and a sporadic E-layer over EISCAT Wave activity, F1-layer disturbance and a sporadic E-layer over EISCAT

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..179l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, March 1989, p. 179-185, 187-196. Research supported by

Physics

10

Atmospheric Tides, Eiscat Radar System (Europe), F 1 Region, Sporadic E Layer, Atmospheric Composition, Diurnal Variations, Gravity Waves, Meridional Flow, Wind Shear

Scientific paper

During July 1987 the EISCAT radars were used to study thin layers in the ionospheric E-region. This paper outlines the observing campaign, describes the radar program used for the UHF experiments, and discusses the 'descending' or 'sequential' layer observed on the afternoon of July 12, during a period of strong wave activity, which could be traced throughout the whole E-Fl transition region. Following the descent of one particularly marked wave, a thin layer developed around 120 km height and lasted about 100 min, with temporary disappearances and periods of upward motion which were related to variations of field aligned ion velocity and in particular to 'convergent nulls' in the velocity profile. The layer was eventually dispersed by a rapid upward surge of ion velocity. Composition analysis shows that the layer contains both long-lived light ions and heavy ions, most probably Fe(+).

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