Statistical study of the DP2 enhancement at the dayside dip-equator compared to low latitudes

Mene, N. M.; Kobea, A. T.; Obrou, O. K.; Zaka, K. Z.; Boka, K.; Amory‐Mazaudier, Christine; Assamoi, P.

doi:10.5194/angeo-29-2225-2011

Cited by 12 publications

(9 citation statements)

References 29 publications

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“…Kashcheyev et al, 2018, have showed the difference in PPEF response as a function of longitude at the beginning of a magnetic storm. Different authors have studied the latitudinal profiles of PPEF in a given longitude sector (Kikuchi et al, 2000; Kobea et al, 2000; Mazaudier et al, 1984; Mene et al, 2011). The diurnal oscillations—having periods between 16 and 28 hr—which can be associated with D dyn are extracted using a band‐pass filter.…”

Section: Discussionmentioning

confidence: 99%

Ionospheric and Magnetic Signatures of a Space Weather Event on 25–29 August 2018: CME and HSSWs

et al. 2020

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We present a study concerning a space weather event on 25–29 August 2018, accounting for its ionospheric and magnetic signatures at low latitudes and midlatitudes. The effects of a storm in several longitudinal sectors (Asia, Africa, America, and the Pacific) have been analyzed using various parameters such as total electron content (TEC), geomagnetic field, and column [O/N2] ratio. Positive ionospheric storms are found in all the longitudinal sectors having its maximum effects in the Asian sector, whereas the negative ionospheric storms have been observed in the summer hemisphere (Northern Hemisphere). A large decrease in [O/N2] ratio in the Northern Hemisphere is a possible cause of the observed negative storm effects. Ionospheric F2 region maximum electron density (NmF2) and TEC have shown a positive correlation during this storm. The study suggests that storm time‐generated wind does not have a uniform planetary extension and mainly affects dayside (America and Pacific) and duskside (Africa) sectors. During the space weather event, we observe an asymmetric variation of the magnetic field as a function of the longitude. On the other hand, the magnetic variations at midlatitudes are found to be symmetric in both hemispheres. A signature of the disturbance dynamo (anti‐Sq circulation) has been observed, mainly at low latitudes. We emphasize that the partial ring current (PRC), estimated by the ASYM‐H magnetic index, must also be taken into account along with the SYM‐H index for a better approximation of ionospheric currents. The study further suggests existence of several electric current cells in the ionosphere, which is consistent with the Blanc‐Richmond model.

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Section: Discussionmentioning

confidence: 99%

Ionospheric and Magnetic Signatures of a Space Weather Event on 25–29 August 2018: CME and HSSWs

et al. 2020

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“…The periods of DP2 are on average of the order of minutes to 3hours. During the last decades many experimental and theoretical studies highlighted the characteristics of prompt penetration of magnetospheric convection (Fejer et al, 1983;Mazaudier et al, 1984;Spiro et al, 1988;Fejer and Scherliess, 1997;Kobéa et al, 1998Kobéa et al, , 2000Peymirat et al, 2000;Mene et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Hemispheric asymmetries in the ionosphere response observed during the high-speed solar wind streams of the 24–28 August 2010

Zaourar

Amory‐Mazaudier

Fleury

2017

Advances in Space Research

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This paper presents the geomagnetic and ionospheric responses to a high speed solar wind stream (HSS) impacting the magnetosphere on 24 August 2010. We focus our study on the interhemispheric conjugated behavior. The solar wind speed remained very high during 5 days from 24 to 28 August 2010. By using magnetometer and ground-based GPS data from various approximately conjugated magnetic observatories and GPS stations, we studied the hemispheric asymmetries in the magnetic signature, Vertical Total Electron Content (VTEC) and scintillation activity during this HSS event. Geomagnetic activity reveals larger disturbances in amplitude in the Northern Hemisphere (NH) than in the southern Hemisphere (SH), and stronger asymmetries at higher latitudes, than at lower latitudes, between the conjugate observatories. VTEC variations reveal large increases in amplitude in the NH; while these effects are less pronounced in the SH. We investigate also the GPS scintillation activities occurring in the conjugated polar regions under HSSs conditions. At auroral latitudes, our results show a good correlation between the rate of VTEC index (ROTI) and auroral Al index, with more intense phase fluctuations in the NH.

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“…The magnetic disturbance associated to this physical process was named DP 2 by Nishida [1968]. Many experimental and theoretical studies of the prompt penetration of magnetospheric convection were made during the last decades [ Vasyliunas , 1970; Senior and Blanc , 1984; Mazaudier , 1985; Spiro et al , 1988; Kikuchi et al ,1996; Kobéa et al , 1998, 2000; Peymirat et al 2000; Mene et al , 2011].…”

Section: Introductionmentioning

confidence: 99%

Signature of the coronal hole near the north crest equatorial anomaly over Egypt during the strong geomagnetic storm 5 April 2010

et al. 2012

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International audienceIn this paper we study the ionospheric-magnetic disturbance during a strong magnetic storm on 5 April 2010 associated to a coronal hole. The Earth was under the influence of a high speed solar wind stream during four days, and IMF was southward during a very long period. The variation of the disturbed magnetic observations and GPS-TEC are compared with the variation of quiet days during the same month in order to obtain the characteristics of GPS-TEC and magnetic disturbances due to the coronal hole effect. We use multi-instruments as SCINDA-GPS station at Helwan, Egypt (29.86 N, 31.32 E) and ASW-MAGDAS station at Aswan, Egypt (23.59 N, 32.51 E) in the equatorial region. At the beginning of the storm our data highlights the effect of the prompt penetration of the magnetosphere electric field which strongly increases the TEC. During the recovery phase of the storm, we observe on TEC and magnetic data, the signature of the ionospheric disturbance dynamo due to wind produced by Joule heating in the auroral zone. It is the first time that we observe an anti-Sq circulation on magnetic data during four consecutive days associated to the high speed solar wind streams

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Statistical study of the DP2 enhancement at the dayside dip-equator compared to low latitudes

Cited by 12 publications

References 29 publications

Ionospheric and Magnetic Signatures of a Space Weather Event on 25–29 August 2018: CME and HSSWs

Ionospheric and Magnetic Signatures of a Space Weather Event on 25–29 August 2018: CME and HSSWs

Hemispheric asymmetries in the ionosphere response observed during the high-speed solar wind streams of the 24–28 August 2010

Signature of the coronal hole near the north crest equatorial anomaly over Egypt during the strong geomagnetic storm 5 April 2010

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