Plasma bubbles in the topside ionosphere: Estimations of the survival possibility

Sidorova, L. N.; Филиппов, С. В.

doi:10.1016/j.jastp.2014.06.013

Cited by 15 publications

(15 citation statements)

References 34 publications

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“…The instability is triggered by perturbations in the bottomside F region [ Kelley et al , ; McClure et al , ; Sekar et al , ; Abdu et al , , ; Narayanan et al , ] when the background ionosphere in the post sunset hours is favorable for growth of the instability [ Abdu et al , ; Jayachandran et al , ; Fejer et al , ]. They often grow to the topside ionospheric altitudes within few tens of minutes [ Sultan , ; Sidorova and Filippov , ; Patra et al , ]. As they rise in altitude, the depletions are mapped to low latitudes along the geomagnetic field lines [ Rohrbaugh et al , ].…”

Section: Introductionmentioning

confidence: 99%

“…Since the production decreases with height in the F region ionosphere due to the decreasing density, longer periods are required to refill the top portions of the EPBs. Estimations show that it takes a few hours after sunrise to refill depleted flux tubes at altitudes greater than 700 km [Huang et al, 2013;Sidorova and Filippov, 2014]. There are many reports on scintillation and EPB measurements in the ionization anomaly crest regions around 15°magnetic latitudes [Immel et al, 2004;Lee et al, 2009;Candido et al, 2011;Abadi et al, 2014].…”

Section: Introductionmentioning

confidence: 99%

“…Further, there are few reports showing the existence of EPBs at magnetic latitudes as large as 30° [Martinis and Mendillo, 2007;Martinis et al, 2009;Otsuka et al, 2012]. In these extreme cases the apex altitudes reached by the EPBs over the dip equator penetrate into the plasmasphere and satellite observations of topside He + depletions are indeed interpreted as signature of EPBs [Sidorova, 2007;Sidorova and Filippov, 2014]. The time required to fill those depletions will be on the order of several hours after sunrise.…”

Section: Introductionmentioning

confidence: 99%

“…The current understanding is that the small‐scale irregularities decay sooner, while the EPBs themselves persist till sunrise as inactive fossil features. This is because cross field plasma diffusion is an extremely slow process to refill depletions with scale sizes of few tens of kilometers [ Burke et al , ; Sidorova and Filippov , ]. Since the production decreases with height in the F region ionosphere due to the decreasing density, longer periods are required to refill the top portions of the EPBs.…”

Section: Introductionmentioning

confidence: 99%

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Shrinking equatorial plasma bubbles

et al. 2016

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The formation of equatorial plasma bubbles (EPBs) associated with spread F irregularities are fairly common phenomenon in the postsunset equatorial ionosphere. These bubbles grow as a result of eastward polarization electric field resulting in upward E × B drift over the dip equator. As they grow they are also mapped to low latitudes along magnetic field lines. The EPBs are often observed as airglow depletions in the images of OI 630 nm emission. On occasions the growth of the features over the dip equator is observed as poleward extensions of the depletions in all‐sky images obtained from low latitudes. Herein, we present interesting observations of decrease in the latitudinal extent of the EPBs corresponding to a reduction in their apex altitudes over the dip equator. Such observations indicate that these bubbles not only grow but also shrink on occasions. These are the first observations of shrinking EPBs. The observations discussed in this work are based on all‐sky airglow imaging observations of OI 630.0 nm emission made from Panhala (11.1°N dip latitude). In addition, ionosonde observations made from dip equatorial site Tirunelveli (1.1°N dip latitude) are used to understand the phenomenon better. The analysis indicates that the speed of shrinking occurring in the topside is different from the bottomside vertical drifts. When the EPBs shrink, they might decay before sunrise hours.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shrinking equatorial plasma bubbles

et al. 2016

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show abstract

“…According to them, the EPBs are generated in the bottom side of F-region (e.g., [9,17]) at the equator, mainly by the nonlinear evolution of the generalized Rayleigh-Taylor (GRT) instability [18] and E × B drift [14]. After sunset, the rapid uplifting of F-region is one of the key factors in generating of EPBs [19,20].…”

Section: Introductionmentioning

confidence: 99%

Study of Equatorial Plasma Bubbles Using ASI and GPS Systems

Nade¹,

Potdar²,

Pawar³

2020

Geographic Information Systems in Geospatial Intelligence

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The plasma irregularities have been frequently observed in the F-region, at low latitude regions, due to the instability processes occurring in the ionosphere. The depletions in electron density, as compared to the background density, is a signature of the plasma irregularities. These irregularities are also known as the “equatorial plasma bubble” (EPB). These EPBs can measure by the total electron content (TEC) using GPS receiver and by images of the nightglow OI 630.0 nm emissions using all sky imager (ASI). The current chapter is based on the review on the signature of the EPBs in TEC and ASI. measurements. We have also discussed the importance of the study of EPBs.

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Direct observational evidence for the merging of equatorial plasma bubbles

2016

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In this work we present direct ground‐based observational evidence for the merging of individual equatorial plasma bubbles (EPBs) obtained through the imaging of OI 630.0 nm airglow. Three potential mechanisms have been identified: (1) One of the EPBs tilts and reaches location of the adjacent growing EPB finally merging with it. (2) Some of the branches of an EPB arising from secondary instabilities reach out to adjacent EPB and merge with it. (3) The eastward zonal drift of the EPB on the eastern side slows down while the adjacent EPB on the western side drifts relatively faster and catches up. In one of the cases, a branch of an EPB was observed to get interchanged with another EPB as a result of merging and consequent pinching off from the parent EPB.

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Plasma bubbles in the topside ionosphere: Estimations of the survival possibility

Cited by 15 publications

References 34 publications

Shrinking equatorial plasma bubbles

Shrinking equatorial plasma bubbles

Study of Equatorial Plasma Bubbles Using ASI and GPS Systems

Direct observational evidence for the merging of equatorial plasma bubbles

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