Apposite of atmospheric electric parameters with the energy coupling function (ε) during geomagnetic storms at high latitude

Kumar, C. Sathish; Panneerselvam, C.; Nair, K. U.; Jeyakumar, H. Johnson; Selvaraj, C.; Gurubaran, S.; Venugopal, Chandu

doi:10.1016/j.atmosres.2008.06.005

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…In general, they reported a decrease in the electric field that later recovers to pre auroral condition. Using atmospheric potential gradient and current density data, obtained in 2003 from the same location Anil Kumar et al (2009) showed that the solar wind-magnetosphere energy coupling function (e) enhances the potential gradient and current density. It is also discussed that during the magnetic storm activity there is usually a decrease in the cosmic ray flux which in actual increases in the columnar resistance Zhou 2006, Devendra Singh andSingh, 2009).…”

Section: Geomagnetic Field and Potential Gradientmentioning

confidence: 99%

Global electric circuit parameters and their variability observed over Maitri, Antarctica

Jeeva¹,

Panneerselvam²,

Nair³

et al. 2011

J Geol Soc India

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The global component of fairweather electricity is subject to special attention to watch the solar-terrestrial effects and secular changes in climate. It is generally considered that the diurnal variation of atmospheric electricity parameters, if they are not following the Carnegie pattern, are not representative of the global thunderstorm activity. Some of the results obtained from Maitri (70°45'54"S, 11°44'03"), are discussed here in context with global thunderstorm activity and space weather influences. The diurnal pattern of the Potential Gradient and current density strongly deviate from the Carnegie curve. We have showed that this deviation is not due to the local electrical influence but due to the global thunderstorm activity. During fairweather condition the parameters are representing the global thunderstorm activity and to some extent they respond to the upper atmospheric electro dynamic phenomenon. The mean value of the potential gradient (77.7 V/m) and current density (2.13 pA/m 2 ) well below the expected global mean but close to the value reported from the same location and season in the past years. The mean conductivity, 3.34 x 10 -14 mhom -1 , is slightly at higher side and they exhibit a different diurnal trend comparing to the past measurements at this location.

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Section: Geomagnetic Field and Potential Gradientmentioning

confidence: 99%

Global electric circuit parameters and their variability observed over Maitri, Antarctica

Jeeva¹,

Panneerselvam²,

Nair³

et al. 2011

J Geol Soc India

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Anomalous diurnal variation of atmospheric potential gradient and air‐Earth current density observed at Maitri, Antarctica

Jeeva¹,

Gurubaran

Williams

et al. 2016

JGR Atmospheres

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The scope of this paper is to explore the mechanisms operating over Maitri (70.76°S, 11.74°E, 117 m above mean sea level), a coastal Antarctic station, that produce an anomalous fair‐weather diurnal pattern of the atmospheric electric potential gradient (PG) and air‐Earth current density (AEC). The anomaly in the diurnal variations of AEC and the PG is displaying an ostensible minimum at ~10 UT and a diminished response to the thunderstorm over the African continent in the 14–16 UT time frame. The data sets (2005–2014, except 2012) of the PG, and to some extent, AEC, from Maitri, are used to explore this anomaly. It follows that the fair‐weather electrical phenomena over Maitri can be ascribed to global electrified convection on the one hand and to regional phenomena like convection due to the replacement of warm air by katabatic winds on the other hand. The katabatic winds originate on the polar plateau and blow from ~130° at Maitri which are likely to transport various elements from the mountain slopes, and space charge from the polar plateau is expected to produce various disturbances in the PG and AEC monitored over the coastal Antarctica. This mechanism may be responsible for peaks in the early UT hours and also for the anomalous behavior of atmospheric electrical parameters observed at Maitri. Maitri data are compared with that of Carnegie cruise and Vostok to explain the source of anomaly.

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Variation of surface electric field during geomagnetic disturbed period at Maitri, Antarctica

Victor¹,

Panneerselvam²,

Kumar³

2015

J Earth Syst Sci

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The paper discusses on the variations of the atmospheric vertical electric field measured at sub-auroral station Maitri (70 • 75 ′ S, 11 • 75 ′ E), and polar station Vostok (78.5 • S, 107 • E) during the geomagnetic disturbances on 25-26 January 2006. Diurnal variation of surface electric field measured at Maitri shows a similar variation with worldwide thunderstorm activity, whereas the departure of the field is observed during disturbed periods. This part of the field corresponds to the magnetospheric/ionospheric (an additional generator in the polar regions) voltage generators. Solar wind parameters and planetary indices represent the temporal variation of the disturbances, and digital fluxgate magnetometer variation continuously monitored to trace the auroral movement at Maitri. We have observed that the electrojet movement leaves its signature on vertical and horizontal components of the DFM in addition; the study infers the position of auroral current wedge with respect to Maitri. To exhibit the auroral oval, OVATION model is obtained with the aid of DMSP satellite and UV measurements. It is noted that the Maitri is almost within the auroral oval during the periods of disturbances. To examine the simultaneous changes in the vertical electric field associated with this magnetic disturbance, the dawn-dusk potential is studied for every UT hours; the potential was obtained from Weimer model and SuperDARN radar. The comparison reveals the plausible situation for the superposition of dawn-dusk potential on surface electric field over Maitri. This observation also shows that the superposition may not be consistent with the phase of the electrojet. Comparison of surface electric field at Maitri and Vostok shows that the parallel variation exhibits with each other, but during the period of geomagnetic disturbances, the influence is not much discerned at Vostok.

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Apposite of atmospheric electric parameters with the energy coupling function (ε) during geomagnetic storms at high latitude

Cited by 3 publications

References 12 publications

Global electric circuit parameters and their variability observed over Maitri, Antarctica

Global electric circuit parameters and their variability observed over Maitri, Antarctica

Anomalous diurnal variation of atmospheric potential gradient and air‐Earth current density observed at Maitri, Antarctica

Variation of surface electric field during geomagnetic disturbed period at Maitri, Antarctica

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