Moderate geomagnetic storms and their ionospheric effects at middle and low latitudes

Mansilla, Gustavo Adolfo

doi:10.1016/j.asr.2011.03.034

Cited by 10 publications

(8 citation statements)

References 11 publications

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“…The negative storm response during the pre-storm phenomenon in equatorial region and mid latitude may be as a result of large northward value of electric field and large southward turning of interplanetary magnetic field (IMF) Bz. Many research has been carried out on the positive and negative ionospheric disturbances at the mid-and highlatitude using different modelling and method (Rakhee et al 2010;Mukherjee et al 2010;Romanova et al 2008;Rishbeth and Mendillo 2001;Bencze et al 2004;Tsagouri et al 2000;Namgaladze et al 2000;Vasiljevic and Cander 1996), with only few mention on equatorial region (Mansilla 2011;Prölss 2006;Pavlov et al 2006), the result confirmed prompt effects of geomagnetic disturbances at all latitudes. The recent research on ionospheric F2 region have confirmed a pronounce effect of geomagnetic storm on low latitude ionosphere.…”

Section: Discussionsupporting

confidence: 86%

On the effects of geomagnetic storms and pre storm phenomena on low and middle latitude ionospheric F2

Adekoya

Chukwuma

Bakare

et al. 2012

Astrophys Space Sci

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This paper presents some features of the ionospheric response observed in equatorial and mid-latitudes region to two strong geomagnetic storms, occurring during Oct. 19-23, 2001 and May 13-17, 2005 and to understand the phenomena of pre-storm that lead to very intense geomagnetic storms. The result point to the fact that pre-storm phenomena that leads to intense ionospheric storm are; large southward turning of interplanetary magnetic field Bz, high electric field, increase in flow speed stream, increase in proton number density, high pressure ram and high plasma beta. The magnitude of Bz turning into southward direction from northward highly depends upon the severity of the storm and the variation in F2 layer parameter at the time of geomagnetic storm are strongly dependent upon the storm intensity. A detailed analysis of the responses of the ionosphere shows that during the storm periods, foF2 values depleted simultaneously both in the equatorial and mid latitude. Observation also shows that low to moderate variations in ionospheric F2 at the pre-storm period may signal the upcoming of large ionospheric disturbances at the main phase. The ionospheric F2response for low and mid latitude does not show any significant differences during the storm main phase and the prestorm period. The ionospheric response during the pre-storm period is thought very puzzling. The period is observed to be depleted throughout with low-moderate effect across all the stations in the low and mid latitude.

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Section: Discussionsupporting

confidence: 86%

On the effects of geomagnetic storms and pre storm phenomena on low and middle latitude ionospheric F2

Adekoya

Chukwuma

Bakare

et al. 2012

Astrophys Space Sci

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“…Enhancements in ionospheric electron density prior to intense geomagnetic storms but at high latitudes have been already observed (e.g., Kane, 2005;Mansilla, 2011). Although there is no simple explanation for the ionospheric positive disturbances occurring before storm onset a probable mechanism is a soft particle precipitation (emanating from solar flares but reaching the Earth a few hours later) in the region of the dayside cusp, as already was considered by Kane (2005).…”

Section: Discussionmentioning

confidence: 88%

Some ionospheric storm effects at equatorial and low latitudes

Mansilla¹

2014

Advances in Space Research

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“…A number of works have addressed global ionosphere variations during disturbances. One of the possible approaches is to study the behavior of parameters along different meridians (Mansilla, 2011;. The majority of studies on the latitudinal or longitudinal dependences of ionospheric responses are limited to a particular latitudelongitude region, although there are studies on global density distributions.…”

Section: Introductionmentioning

confidence: 99%

Impact of magnetic storms on the global TEC distribution

2018

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Abstract. The study is focused on the analysis of total electron content (TEC) variations during six geomagnetic storms of different intensity: from Dstmin=-46 nT to Dstmin=-223 nT. The values of TEC deviations from its 27-day median value (δTEC) were calculated during the periods of the storms along three meridians: American, Euro-African and Asian-Australian. The following results were obtained. For the majority of the storms almost simultaneous occurrence of δTEC maximums was observed along all three meridians at the beginning of the storm. The transition from a weak storm to a superstorm (the increase of magnetic activity) almost does not affect the intensity of the δTEC maximum. The seasonal effect was most pronounced along the Asian-Australian meridian, less often along the Euro-African meridian and was not revealed along the American meridian. Sometimes the seasonal effect can penetrate to the opposite hemisphere. The character of average δTEC variations for the intense storms was confirmed by GOES satellite data. Though there are some common features of TEC variation revealed during each storm phase, in general no clear dependence of TEC responses on the storm phases was found: the effects were different during each storm at different locations. The behavior of the correlation coefficient (R) between δTEC values along the three meridians was analyzed for each storm. In general, R>0.5 between δTEC values averaged along each meridian. This result is new. The possible reasons for the exceptions (when R<0.5) were provided: the complexity of phenomena during the intense storms and discordance in local time of the geomagnetic storm beginning along different meridians. Notwithstanding the complex dependence of R on the intensity of magnetic disturbance, in general R decreased with the growth of storm intensity.

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Moderate geomagnetic storms and their ionospheric effects at middle and low latitudes

Cited by 10 publications

References 11 publications

On the effects of geomagnetic storms and pre storm phenomena on low and middle latitude ionospheric F2

On the effects of geomagnetic storms and pre storm phenomena on low and middle latitude ionospheric F2

Some ionospheric storm effects at equatorial and low latitudes

Impact of magnetic storms on the global TEC distribution

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