Ionospheric effects of magnetospheric and thermospheric disturbances on March 17–19, 2015

Полех, Н. М.; Золотухина, Н. А.; Романова, Елена; Пономарчук, С. Н.; Kurkin, V. I.; Podlesnyi, A. V.

doi:10.1134/s0016793216040174

Cited by 22 publications

(6 citation statements)

References 21 publications

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“…The last of the most striking geoactive events is the severe two‐step St. Patrick's Day storm, which caused the loss of the high‐frequency (HF) radio signals at high and middle latitudes of Russia [ Ponomarchuk et al ., ; Polekh et al ., ; Blagoveshchensky et al ., ]. The storm started on 17 March 2015.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric effects of St. Patrick's storm over Asian Russia: 17–19 March 2015

et al. 2017

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We have carried out a comprehensive analysis of data from the high‐frequency coherent radar located near Yekaterinburg, ground‐based ionospheric, riometric, and magnetic stations, situated within the radar field of view and in the vicinity of it, as well as from eight radio paths crossing the Asian region of Russia. Using these data, we studied dynamics of ionospheric disturbances over wide longitudinal sector during the first 3 days of the St. Patrick's two‐step severe geomagnetic storm and determined the main mechanisms of their development. We showed that on 17 March during the main and early recovery storm phases, the major contribution to the generation of the ionospheric disturbances had been made by impact ionization by precipitating magnetospheric particles. This had lead to appearance of intense sporadic layers, alternating with intervals of total absorption. The main features of the storm were the large latitude width of the auroral precipitation zone and an expansion of this zone to corrected geomagnetic latitude ~ 45°. We suppose that these peculiarities were due to high variability of interplanetary magnetic field and solar wind impacted on the magnetosphere. The most probable cause of the negative ionospheric disturbance on 18 March might have been a change in the neutral atmosphere composition. Significant differences between measured and simulated values of maximal electron concentration in F2 layer point to the need to improve the existing empirical models of thermosphere, auroral precipitations, and magnetospheric convection in order to use them for modeling of ionospheric parameters during severe geomagnetic storms.

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Section: Introductionmentioning

confidence: 99%

Ionospheric effects of St. Patrick's storm over Asian Russia: 17–19 March 2015

et al. 2017

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“…The storms considered in the present study were also the subject of several case studies, mostly for some particular region. For example, Polekh et al (2016) addressed the event of 17 March 2015, Astafyeva et al (2016) studied the iono-sphere during 22 June 2015 and Chashei et al (2016) considered ionospheric effects during the storm on 20 December 2015. In our case the focus is on global effects.…”

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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“…For example, Polekh et al (2016) The aim of this work was to reveal the features of TEC variations during the particular geomagnetic storms along three meridians: American, Euro-African and Asian-Australian. The tasks were to: (1) obtain TEC variations along each meridian, (2) find if there is any correlation between these variations, (3) reveal if there is a peculiar character of TEC behaviour during the considered storms if compare to the quiet conditions and how this character depends on the intensity of disturbance and on the meridian itself.…”

Section: Introductionmentioning

confidence: 99%

Impact of magnetic storms on the global TEC distribution

Blagoveshchensky¹,

Maltseva²,

Sergeeva³

2018

Preprint

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Abstract. The study is focused on the analysis of Total Electron Content (TEC) variations during six geomagnetic storms of 10 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 AsianAustralian. The following results were obtained. For the majority of the storms almost simultaneous occurrence of δTEC maximums was observed along the Asian-Australian and Euro-African meridians at the beginning of the storm. The transition from weak storm to superstorm (the increase of magnetic activity) almost does not affect the intensity of δTEC 15 maximum. The effect revealed for the American sector during two storms was the movement of the disturbance front from Northern and Southern high latitudes towards the equator with the average velocity of ~ 400 m/s. The seasonal effect was most pronounced at Asian-Australian meridian, less often at Euro-African meridian and was not revealed at American meridian. Sometimes the seasonal effect can penetrate to the opposite hemisphere. The character of averaged δTEC variations for the intense storms was confirmed by GOES satellite data. The behaviour of correlation coefficient (R) between 20 δTEC at three meridians was analyzed for each storm. In general, R>0.5 between δTEC averaged along each meridian. This result is new. The possible reasons for the exceptions (when R < 0.5) were provided: time-shift of δTEC maximum at different latitudes along the American meridian, the complexity of phenomena during the intense storms and discordance in local time of geomagnetic storm beginning at different meridians. Notwithstanding the complex dependence of R on the intensity of magnetic disturbance, in general R decreased with the growth of storm intensity. 25

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Ionospheric effects of magnetospheric and thermospheric disturbances on March 17–19, 2015

Cited by 22 publications

References 21 publications

Ionospheric effects of St. Patrick's storm over Asian Russia: 17–19 March 2015

Ionospheric effects of St. Patrick's storm over Asian Russia: 17–19 March 2015

Impact of magnetic storms on the global TEC distribution

Impact of magnetic storms on the global TEC distribution

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