High resolution OI (630 nm) image measurements of F‐region depletion drifts during the Guará Campaign

Taylor, Michael J.; Eccles, J. V.; LaBelle, J.; Sobral, J. H. A.

doi:10.1029/97gl01207

Cited by 70 publications

(70 citation statements)

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“…The climatology and characteristics of low-latitude F-region plasma drift have been extensively studied over the past few decades using ground-based radar observations, optical measurements, ionosonde, and satellite observations [1,2,3,4,5,6,7,8]. The previous studies have shown that the night-time zonal plasma drifts in geomagnetically quiet days were eastward while plasma drift during the geomagnetic disturbance days are westward.…”

Section: Introductionmentioning

confidence: 99%

Equatorial ionospheric plasma drifts velocities using radar observations

Chapagain

2016

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This study presents the experimental results of the equatorial ionospheric plasma drift zonal velocity obtained from Incoherent Scatter Radar (ISR) observations for 6 selective days in 2011 from Jicamarca, Peru. Our results indicate that the daytime drifts are westward with peak values mostly below ~50 m/s, while the night time drifts velocities are eastward, with a maximum value up to 120 m/s at around local midnight hours. The drift velocity decreases during post-midnight hours and starts to reverse westward in early morning hours. Our plasma drifts results are in good agreement with results from previous radar studies and other measurement techniques.

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Section: Introductionmentioning

confidence: 99%

Equatorial ionospheric plasma drifts velocities using radar observations

Chapagain

2016

BIBECHANA

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“…Liu (jyliu@jupiter.ss.ncu.edu.tw) bubbles (EPBs) associated with Equatorial Spread-F (ESF) irregularities (Mendillo and Baumgardner, 1982;Sahai et al, 2000;Fagundes et al, 1999;Taylor et al, 1997;Sinha et al, 2001;Kelley et al, 2002;Makela et al, 2004;Mendillo et al, 2005;Rajesh et al, 2007). The irregularities are generated at the magnetic equator when suitable conditions exist at the F-region bottom-side in the post-sunset period, and manifest themselves as dark bands of intensity depletions in the airglow images taken from equatorial and low-latitude stations (Weber et al, 1978;Mendillo et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Airglow observations over the equatorial ionization anomaly zone in Taiwan

et al. 2011

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Abstract. Airglow imaging at mid-latitude stations often show intensity modulations associated with medium scale travelling ionospheric disturbances (MSTID), while those carried out near the equatorial regions reveal depletions caused by equatorial plasma bubbles (EPB). Two all sky cameras are used to observe plasma depletions in the 630.0 nm emission over the equatorial ionization anomaly (EIA) region, Taiwan (23 • N, 121 • E; 13.5 • N Magnetic) during 1998-2002 and 2006-2007. The results show EPB and MSTID depletions in different solar activity conditions. Several new features of the EPB depletions such as bifurcation, secondary structure on the walls, westward tilt, etc., are discussed in this paper. Evidence of tilted depletions with secondary structures developing on the eastern wall that later evolve to appear as bifurcations, are presented for the first time. Moreover, detail investigations are carried out using International Reference Ionosphere (IRI) model as well as the electron density from Ionosonde and Global Positioning System (GPS) Occultation Experiment (GOX) onboard FORMOSAT-3/COSMIC satellite, to understand the conditions that favor the propagation of MSTID to the latitude of Taiwan.

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“…Once produced in the post-sunset equatorial ionosphere, plasma bubbles appear as localized decreases in airglow brightness and can be tracked across the nightside to determine their zonal drift speed. Under the assumption that these depletions are embedded in the surrounding plasma, one can equate the bubble drift speed with the drift of the ambient ionospheric plasma (Mendillo and Baumgardner, 1982;Taylor et al, 1997;Pimenta et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Global observations of the zonal drift speed of equatorial ionospheric plasma bubbles

et al. 2004

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Abstract. Space-based measurements from an imager aboard the high-apogee NASA-IMAGE satellite allows for global-scale observations of nightside ionospheric densities and structure. Such a view cannot be provided by imagers in near-Earth orbit or based on the ground. The IMAGE Spectroscopic Imager (SI) isolates the Far-ultraviolet (FUV) O I 135.6 nm emission which is produced through radiative recombination of O + . These observations clearly show the distribution of FUV emissions of the equatorial airglow bands over the range of local times between the evening terminator to points well after midnight. Determination of plasma drift speeds in these local time sectors is performed by identification and subsequent tracking of localized depressions in the FUV emissions. This determination is made for nearly 200 plasma bubbles in the March-May period of 2002. Important findings of this study include (1) an unambiguous association between D st and zonal plasma drift speeds, and (2) a longitudinal dependence of the zonal plasma drift speeds, with a peak around the Indian sector. The first effect is attributed to penetrating ring current electric fields, while the second is apparently due to a longitudinal variability in the vertical polarization electric fields that directly affects the zonal plasma drift speeds.

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High resolution OI (630 nm) image measurements of F‐region depletion drifts during the Guará Campaign

Abstract: Abstract.A high performance, all-sky, imaging system has pro-

Cited by 70 publications

References 9 publications

Equatorial ionospheric plasma drifts velocities using radar observations

Equatorial ionospheric plasma drifts velocities using radar observations

Airglow observations over the equatorial ionization anomaly zone in Taiwan

Global observations of the zonal drift speed of equatorial ionospheric plasma bubbles

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