Diurnal variation of surface currents at a tropical station

Kulkarni, M. N.; Pawar, S. D.; Murugavel, P.; Gopalakrishnan, V.

doi:10.1016/j.jastp.2009.10.010

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…These ions attach to aerosol particles and lead to reduction in progeny concentration near the surface by the onset of convection after sunrise (Raghavayya, 1998;Nagaraja et al, 2003b). Measurements of air conductivity and space charge at this place by Pawar and Kamra (2000) and Kulkarni et al (2010) also show high values during night compared to day. They have attributed such high value of space charge density and conductivity to the increased radioactive gas concentration near the Earth surface due to stable atmosphere during that time.…”

Section: Resultsmentioning

confidence: 99%

Estimation of small ion concentration near the Earth's surface

Nagaraja¹,

Pawar²,

Murugavel³

et al. 2011

Journal of Atmospheric and Solar-Terrestrial Physics

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a b s t r a c tAtmospheric ions produced by radon gas exhalation from the Earth's surface can play a vital role in the electrification of atmosphere, especially during nights when the gases are trapped in a stable layer close to the surface. The measurements of concentration of radon and its progeny, air conductivity and aerosol size distribution made at Pune, India, have been analyzed. The concentrations of radon and its progeny show maxima during night and early morning hours, between 0500 and 0700 IST when atmosphere is more stable and mixing is low and start decreasing after sunrise and attain minima during 1000-1800 h when air is unstable. The diurnal variation of the ionization rate, calculated using the concentrations of radon and its progeny, follows the variations of concentrations of radon and its progeny. The ion-aerosol balance equations are solved to study the effect of aerosols on small ion concentration in the lower atmosphere. It has been found that during daytime when aerosol concentration is high, 20-30% reduction in small ion concentration can occur due to aerosols. The small ion concentration estimated using measured air conductivity is compared with small ion concentration estimated by solving ion-aerosol balance equations and both are found to be in good agreement with each other.

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Section: Resultsmentioning

confidence: 99%

Estimation of small ion concentration near the Earth's surface

Nagaraja¹,

Pawar²,

Murugavel³

et al. 2011

Journal of Atmospheric and Solar-Terrestrial Physics

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“…However, this behavior is not consistent with our observations. Space charge generation near the ground is also enhanced during nighttime conditions as a result of several physical mechanisms [ Dhanorkar and Kamra , ; Kulkarni et al ., ; Anisimov et al ., ]. The latter explanation is also contradictory to our results, since the presence of additional charge in the vicinity of the CG leader near the ground is expected to inhibit the electric field strength, ultimately leading to weaker −CG peak currents.…”

Section: Discussionmentioning

confidence: 99%

Climatological diurnal variation of negative CG lightning peak current over the continental United States

et al. 2015

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This study provides an 11 year climatology of the diurnal variability of the cloud-to-ground (CG) lightning peak current. The local diurnal variation of peak current for negative polarity CG (ÀCG) flashes exhibits a highly consistent behavior, with increasing magnitudes between the late night to early morning hours and decreasing magnitudes during the afternoon. Over most regions, an inverse relationship exists between the ÀCG peak current and the corresponding ÀCG activity, although specific details can depend on region and time of day. Overall, the diurnal variation of the ÀCG peak current appears to reflect fundamental differences between morning and afternoon storms, but additional studies are required to clearly identify the primary cause(s).

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Diurnal variation of surface currents at a tropical station

Cited by 2 publications

References 22 publications

Estimation of small ion concentration near the Earth's surface

Estimation of small ion concentration near the Earth's surface

Climatological diurnal variation of negative CG lightning peak current over the continental United States

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