Diurnal variations of the atmospheric electric field and conductivity at Maitri, Antarctica

Deshpande, C. G.; Kamra, A. K.

doi:10.1029/2000jd900675

Cited by 36 publications

(37 citation statements)

References 26 publications

(2 reference statements)

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“…The signal from the field mill is amplified with Op-Amp 1596 which is mounted inside the field mill. Further details are available in Deshpande and Kamra (2001).…”

Section: Description Of the Instrumentmentioning

confidence: 99%

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Fairweather atmospheric electricity at Antarctica during local summer as observed from Indian station, Maitri

Panneerselvam¹,

Selvaraj²,

Jeeva³

et al. 2007

J Earth Syst Sci

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Surface measurements of the atmospheric electrical parameters like Maxwell current, electric field and conductivity studied at the Indian station, Maitri (70.75 • S, 11.75 • E, 117 m above mean sea level), Antarctica, during austral summer have been analyzed for the years 2001 to 2004. A total of 69 days were selected which satisfied the 'fairweather' conditions, i.e., days with absence of high winds, drifting or falling snow, clouds, and fog effects. The diurnal variation curve of electric field and vertical current averaged for 69 fairweather days is a single periodic with a minimum at 03:00 UT and a maximum near 19:00 UT, which is very similar to the Carnegie curve. The correlation coefficient between these measured parameters has a high value (more than 0.9) for all the days. During fairweather days the measured current and field variations are similar and hence it is clear that the conductivity is more or less stable. During magnetically disturbed days, the dawn-dusk potential drop has clear influences on the diurnal variation and it modifies the conductivity. Apart from the day-to-day variation in low latitude thunderstorm activity, there are diurnal, seasonal, inter-annual variations in the electric potential and the currents, as well as solar influences on the measured parameters. This study will help us to examine the impact of solar and geophysical phenomena like solar flares, geomagnetic storms and substorms on the global electric circuit.

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“…The signal from the field mill is amplified with Op-Amp 1596 which is mounted inside the field mill. Further details are available in Deshpande and Kamra (2001).…”

Section: Description Of the Instrumentmentioning

confidence: 99%

“…The maintenance of the instruments, especially cleaning of their insulators, was done daily. The zero shifts are checked twice a day and are corrected if the deviations are appreciable (Deshpande and Kamra 2001).…”

Section: Description Of the Instrumentmentioning

confidence: 99%

Fairweather atmospheric electricity at Antarctica during local summer as observed from Indian station, Maitri

Panneerselvam¹,

Selvaraj²,

Jeeva³

et al. 2007

J Earth Syst Sci

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“…Kamra et al (1994) have challenged the concept of the classical GEC on the basis of their electric field observations in the Indian Oceans. Recent observations of Deshpande and Kamra (2001) also show that diurnal variation of the electric field at Antarctica significantly differs from the Carnegie diurnal curve of the electric field.…”

Section: Global Electric Circuitmentioning

confidence: 89%

The electrical environment of the Earth’s atmosphere: A review

Singh

Kamra

2004

Space Sci Rev

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The study of the electrical environment of the Earth's atmosphere has rapidly advanced during the past century. Great strides have been made towards the understanding of lightning and thunderstorms and in relating them to the global electric circuit. The electromagnetic fields and currents connect different parts of the Earth's environment, and any type of perturbation in one region affects another region. Starting from the traditional views in which the electrodynamics of one region has been studied in isolation from the neighboring regions, the modern theory of the global electrical circuit has been discussed briefly. Interconnection and electrodynamic coupling of various regions of the Earth's environment can be easily studied by using the global electric circuit model. Deficiencies in the model and the possibility of improvement in it have been suggested. Application of the global electric circuit model to the understanding of the Earth's changes of climate has been indicated.

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“…The variations in surface meteorological parameters were measured by automatic weather station which is installed during this expedition. The cloud cover over the station occurs mainly under the in uence of subpolar low-pressure systems and shows an alternating sequence of the sky changing from overcast to clear as the system moves away (Deshpande and Kamra, 2001). …”

Section: Site Descriptionmentioning

confidence: 99%

Instrumentation for the surface measurements of atmospheric electrical parameters at Maitri, Antarctica: First results

Panneerselvam¹,

Kumar²,

Dhar

et al. 2010

Earth Planet Sp

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We are operating atmospheric electrical instruments like long wire antenna, electric eld meter, wire antenna and passive antenna for atmospheric Maxwell current, electric eld, conduction current and atmospheric potential gradient. This year (December 2008) we have installed Electric Field Meter (EFM-100) and wire antenna for measuring the atmospheric electric eld and conduction current. This instrument is deployed at Maitri, Antarctica and will be operated under any weather conditions like snow fall and strong blizzard etc. The study have been carried out during austral summer for the period of 2008 and 2009 at the Indian station, Maitri (70.75• S, 11.75• E, 117 m above mean sea level). The present work has been to understand the new instrument system in response to different meteorological conditions and on fairweather days. In this paper we have selected the data of the days during magnetically quiet period to minimize the upper atmospheric contribution. Fairweather' conditions, i.e., days with absence of high winds, drifting or falling snow and clouds. The diurnal variation curve of electric eld during fairweather days is a single periodic with a minimum at 04:00 UT and a maximum at 19:00 UT. But atmospheric current variation has minimum 03:00 UT for Maxwell current and conduction current. The maximum for Maxwell current is at 20:00 UT and 19:00 UT for the conduction current, which is very similar to the Carnegie curve. The measured electric eld from the Passive antenna and EFM-100 compared and is behaving similar variation. Using Maxwell current density and conduction current density we have separated the displacement current density.

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Diurnal variations of the atmospheric electric field and conductivity at Maitri, Antarctica

Cited by 36 publications

References 26 publications

Fairweather atmospheric electricity at Antarctica during local summer as observed from Indian station, Maitri

Fairweather atmospheric electricity at Antarctica during local summer as observed from Indian station, Maitri

The electrical environment of the Earth’s atmosphere: A review

Instrumentation for the surface measurements of atmospheric electrical parameters at Maitri, Antarctica: First results

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