Studies of ionospheric F-region response in the Latin American sector during the geomagnetic storm of 21–22 January 2005

Sahai, Y.; Fagundes, P. R.; Jesús, R. de; Abreu, A. J. de; Crowley, G.; Kikuchi, Takashi; Huang, Chao-Tsung; Pillat, V. G.; Guarnieri, F. L.; Abalde, J. R.; Bittencourt, J. A.

doi:10.5194/angeo-29-919-2011

Cited by 30 publications

(23 citation statements)

References 33 publications

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“…This increase indicates that a strong eastward electric field was responsible for the intense electrojet represented here by the decameter size irregularities that constituted the intense sporadic E layer. The Es layer and/or electrojet irregularity intensification under storm time electric fields have been reported before [see, e.g., Rastogi , 1973; Abdu et al , 2003; Sahai et al , 2011]. Here the simultaneous responses both at the F layer heights and in the Es layer confirm the role of the PPEF extended in a wide height region of the equatorial ionosphere.…”

Section: Resultssupporting

confidence: 83%

“…This event is considered anomalous because the storm main phase was accompanied by a strong northward IMF Bz of long duration. Different aspects of this storm have been studied by several authors [e.g., Foullon et al , 2007; Orus et al , 2007; Sreeja et al , 2009; Kane , 2009; Du et al , 2008; Matthiä et al , 2009; McKenna‐Lawlor et al , 2010; Sahai et al , 2011]. Our results show evidences of strikingly contrasting response to prompt penetration electric fields during daytime and evening hours over Jicamarca and Fortaleza, two stations separated by only 30° in longitude in the South American sector.…”

Section: Introductionsupporting

confidence: 51%

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Strong longitudinal difference in ionospheric responses over Fortaleza (Brazil) and Jicamarca (Peru) during the January 2005 magnetic storm, dominated by northward IMF

Santos¹,

Abdu²,

Sobral³

et al. 2012

J. Geophys. Res.

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[1] In this study we investigate the response of the equatorial F layer to disturbance zonal electric field associated with IMF (interplanetary magnetic field) variations dominated by a strong northward Bz episode during the magnetic storm that occurred on 21 January, 2005. We compared the results obtained from Digisondes operated at Fortaleza, Brazil (Geogr. 3.9 S, 38.45 W; dip angle: À11.7 ) and Jicamarca, Peru (Geogr. 12.0 S, 76.8 W; dip angle: 0.64 ). A large auroral activity (AE) intensification that occurred at $1715 UT produced a large F-layer peak height increase (from 300 km to 600 km) over Jicamarca with no noticeable simultaneous effect over Fortaleza. Then the Bz turning northward at $1940 UT with a rapid change in AE that was accompanied by a large decrease of F layer height and total suppression of the PRE over Fortaleza with no simultaneous effect over Jicamarca. Strong increase in the AE index (from $400 to 1000 nT) with superimposed oscillations, under Bz North, that soon followed was associated with increases in both the F layer height and the vertical drift velocity over Fortaleza (at 2130 UT), with no corresponding signatures over Jicamarca. These remarkable contrasting responses to prompt penetration electric field (PPEF) as well as to disturbance wind dynamo electric field (DDEF) and other effects observed at the two locations separated only by 2 h in LT in the South American sector are presented and discussed in this paper. Effects on spread-F development and foF2 behavior during this storm event are also addressed in this work.

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Section: Resultssupporting

confidence: 83%

Section: Introductionsupporting

confidence: 51%

Strong longitudinal difference in ionospheric responses over Fortaleza (Brazil) and Jicamarca (Peru) during the January 2005 magnetic storm, dominated by northward IMF

Santos¹,

Abdu²,

Sobral³

et al. 2012

J. Geophys. Res.

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show abstract

“…Corroborating this assumption, Sahai et al (2011) found that equatorial stations show unusually rapid uplifting of the F-region peak heights (hpF2/hmF2) and a decrease in the NmF2 (proportional to foF2) coincident with the time of storm sudden commencement occurred on 21-22 January 2005. At higher low and middle latitudes the effect is not produced.…”

Section: Discussionmentioning

confidence: 87%

“…However, some storms have been considered "anomalous" because the main phase storm occurred during the northward excursion of the Bz component of IMF. Such is the case of the storm occurred on 22 January 2005 in which minimum Dst reached À105 nT at 07UT (Sahai et al, 2011).…”

Section: Introductionmentioning

confidence: 96%

Some ionospheric storm effects at equatorial and low latitudes

Mansilla¹

2014

Advances in Space Research

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“…This poleward electric field gives rise to a large eastward Hall current and a poleward Pedersen current. This physical process is called ionospheric disturbance dynamo (IDD) [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Response of ionospheric disturbance dynamo and electromagnetic induction during geomagnetic storm

et al. 2015

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During geomagnetic storms, the direct penetration of magnetospheric convection electric field and the ionospheric disturbance dynamo (IDD) take place in the ionosphere. In this paper, we studied variability of IDD and electromagnetic induction (EMI) at different latitudinal sectors during the geomagnetic storms on 7 and 8 September 2002 and 20 and 21 November 2003 with high solar wind speed due to coronal mass ejection. This investigation employs geomagnetic field components (H and Z), the geomagnetic indices (Dst, AL, and AU), solar wind speed (V x ), and interplanetary magnetic field (B z ). It was observed that the H component of geomagnetic field decreases across latitudes, and varies with V x , B z , Dst, AL, and AU indices throughout the difference phases of the storm. Our result demonstrated the dominance of the IDD during the nighttime compared to the daytime. This implies that neutral dynamic wind is greater at night than during the day. Higher ratio ⌬Z/⌬H is observed at nighttime because of the reduction on the E region conductivity, which allowed F region electric fields to dominate. PACS No.: 94.05.S-. Résumé : Pendant les tempêtes géomagnétiques, on observe la pénétration directe d'un champ électrique de convection magnétosphérique et une dynamo de perturbation ionosphérique (IDD) dans l'ionosphère. Nous étudions ici la variabilité de l'IDD et de l'induction électromagnétique (EMI) dans différents secteurs de latitude pendant les tempêtes géomagnétiques des 7-8 septembre 2002 et 20-21 novembre 2003 suite à un vent solaire de haute vitesse causé par éjection de masse du corona. Cette étude utilise les composantes de champ géomagnétique (H et Z), les indices géomagnétiques (Dst, AL et AU), la vitesse du vent solaire (V x ) et le champ magnétique interplanétaire (B z ). Nous observons que la composante H du champ géomagnétique décroit avec la latitude et varie avec V x , B z , Dst, AL et AU tout au long des différentes phases de la tempête. Nos résultats démontrent la dominance de IDD pendant la nuit par rapport au jour. Ceci implique que le vent dynamique neutre est plus grand la nuit que pendant la journée. Nous notons aussi un rapport ⌬Z/⌬H plus important pendant la nuit, suite à une diminution de la conductivité dans la région E, permettant au champ électrique de la région F de dominer. [Traduit par la Rédaction]

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Studies of ionospheric F-region response in the Latin American sector during the geomagnetic storm of 21–22 January 2005

Cited by 30 publications

References 33 publications

Strong longitudinal difference in ionospheric responses over Fortaleza (Brazil) and Jicamarca (Peru) during the January 2005 magnetic storm, dominated by northward IMF

Strong longitudinal difference in ionospheric responses over Fortaleza (Brazil) and Jicamarca (Peru) during the January 2005 magnetic storm, dominated by northward IMF

Some ionospheric storm effects at equatorial and low latitudes

Response of ionospheric disturbance dynamo and electromagnetic induction during geomagnetic storm

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