Plasma bubbles near the dawn terminator in the topside ionosphere

Burke, William I.

doi:10.1016/0032-0633(79)90138-7

Cited by 41 publications

(34 citation statements)

References 17 publications

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“…Stormtime EPBs appear in the evening sector during the main phase and in the pre-dawn sector during recovery (Burke, 1979). Both phenomena require strong eastward electric fields in the local equatorial ionosphere (Ott, 1978).…”

Section: Discussionmentioning

confidence: 99%

Penetration electric fields: A Volland–Stern approach

Burke

2007

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Discussionmentioning

confidence: 99%

Penetration electric fields: A Volland–Stern approach

Burke

2007

Journal of Atmospheric and Solar-Terrestrial Physics

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“…[Bowman, 1978;Burke, 1979;$ingh et al, 1997b]. Based on these statistics, the probability of occurrence is less than 5% during magnetically quiet periods, while during magnetically disturbed periods this probability is almost 15%.…”

Section: Plasma Depletions In the Morning Sectormentioning

confidence: 99%

“…It has been suggested that with increasing magnetic activity the probability of observing equatorial F region plasma depletions decreases in the premidnight sector (see, e.g., Burke [1979] and Singh et al [1997b]). This could be due to a westward electric field buildup in the premidnight sector a few hours after the magnetic disturbances [Blanc and Richmond, 1980].…”

Section: Dependence Of Plasma Depletions On Kpmentioning

confidence: 99%

DE 2 observations of morningside and eveningside plasma density depletions in the equatorial ionosphere

Palmroth¹,

Laakso²,

Fejer³

et al. 2000

J. Geophys. Res.

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Abstract.The occurrence of equatorial density depletions in the nightside F region ionosphere has been investigated by using observations gathered by the polar-orbiting Dynamics Explorer 2 satellite from August 1981 to February 1983. A variety of electric field/plasma drift patterns were observed within these depletions, including updrafting, downdrafting, bifurcating, converging, subsonic, and supersonic flows. The depletions, 116 events in total, are distributed over two groups: group I (eveningside depletions) consists of the events in the 1900-2300 MLT sector, and group II (morningside depletions) are the events in the 2300-0600 MLT sector. A statistical analysis reveals clear differences in the density depletion occurrence rates between the two groups. Magnetic activity appears to suppress the generation of eveningside depletions with a delay of 2-3 hours. In the morningside the probability of observing depletions increases instantly with increasing magnetic activity; yet the best correlation is found with a 2-hour delay. This indicates that in the premidnight sector the substorm-induced dynamo and prompt penetration electric fields induce westward electric fields in the equatorial ionosphere 2 hours after the onset in the auroral region. In the postmidnight sector, high-latitude ionospheric disturbances induce instantly equatorial eastward electric fields that move the F layer to higher altitudes, where it can become unstable to the RayleighTaylor instability. Eveningside depletions were observed at all longitudes except those over the Pacific Ocean, while the morningside depletions occurred mostly over the Pacific and Atlantic-African sectors.

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“…They provided evidence on the existence of deep plasma depletion during sunrise. Occurrence of plasma depletion during the post-midnight and dawn hours have been observed earlier also, but in association with magnetic storm (e.g., Burke, 1979;Su et al, 2004) and thus it is not surprising considering that eastward electric field associated with magnetic storm can produce such depletion during those structures. The upward/northward velocities in the dawntime plume in our observations clearly indicate the presence of eastward electric field.…”

Section: Discussionmentioning

confidence: 78%

Intriguing aspects of F-region plasma irregularities revealed by the Gadanki radar observations during the SAFAR campaign

Patra

Phanikumar

2009

Ann. Geophys.

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Abstract.Intriguing new results of F-region irregularities observed using the Gadanki MST radar during the SAFAR campaigns, which were conducted during the equinox and summer of 2008 that corresponds to low solar activity condition, are presented. The summer observations are first of its kind from Gadanki. Observations revealed remarkably different morphology of the F-region irregularities in summer when compared to that in equinox. In summer, the F-region irregularities were observed as horizontally stratified structures, while in equinox they were observed as plume structures. Further, the irregularities in summer commenced during the post-midnight hours in contrast to their commencement in the post-sunset hours and occurrence extending to post-midnight hours in equinox. In addition, an intriguing observation of the summer time irregularities is that they occurred when the background electron density was remarkably low as characterized by the disappearance of the F layer trace in the ionograms. An interesting event of equinox that was observed for 10 h and extended beyond the sunrise time displayed multiple plume structures having periods similar to those of the E-region velocity variations. These observations are discussed with due focus on the genesis of postmidnight F-region irregularities and their possible linkage to the E-region dynamics.

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Plasma bubbles near the dawn terminator in the topside ionosphere

Cited by 41 publications

References 17 publications

Penetration electric fields: A Volland–Stern approach

Penetration electric fields: A Volland–Stern approach

DE 2 observations of morningside and eveningside plasma density depletions in the equatorial ionosphere

Intriguing aspects of F-region plasma irregularities revealed by the Gadanki radar observations during the SAFAR campaign

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