Fine Structure Signatures in Ground Flashes as a Source for HF Radiation

• Autorzy: Edirisinghe M. , Cooray V.
• Języki publikacji: EN

Abstrakty

EN

Lighting radiation fields below 10 MHz are of considerable interest since these frequencies correspond to the natural resonance of structures with dimensions of a few meters to tens of meters. In this paper we present the fine structure signatures of sub-microsecond range pulses appeared at the leader phase and after the return stroke in negative ground flashes which act as a source for HF radiations at 10 MHz, 5 MHz and 3 MHz observed in Sri Lanka, in the tropics. Of the total sub-microsecond range pulses analyzed, 298 were due to positive field changes and 228 were due to negative field changes. The average rise time of those pulses for both polarities is 127 ns and it was found to be varying from 110-160 ns. The peak amplitude is in the range of 0.65-2.19 V/m. For the total 526 pulses analyzed for this study, the FWHM was between 190-310 ns with an arithmetic mean of 238 ns. Signatures of these pulses are similar to the leader like electric field pulses which acted as a strong source for HF radiations at 10 MHz, 5 MHz and 3 MHz. The initiation process of pulses reported in this study could be similar to the initiation process of leader like pulses.

Słowa kluczowe

EN

HF radiation; lightning; Return stroke; Ground flash

• Wydawca: Przedsiębiorstwo Wydawnictw Naukowych "DARWIN"
• Czasopismo: International Letters of Chemistry, Physics and Astronomy
• Rocznik: 2014
• Tom: Vol. 1
• Strony: 91--104
• Opis fizyczny: Bibliogr. 18 poz., rys., wykr.

Twórcy

autor

Edirisinghe M.

• Department of Physics, University of Colombo, Colombo, Sri Lanka

autor

Cooray V.

• Division for Electricity, Uppsala University, Uppsala, Sweden

Bibliografia

• [1] Weidman C. D., Krider E. P., Uman M. A., Geophysical Research Letters 8 (1981) 931-934.
• [2] Boulch M. L., Hamelin J., Weidman C., 1990. UHF-VHF radiation from lightning. In: Gardner, R. L. (Ed.), Lightning electromagnetics. New York: Hemisphere.
• [3] Le Vine D. M., Meteorology and Atmospheric Physics 37 (1987) 195-204.
• [4] Krider E. P., Weidman C. D., Noggle R. C., Journal of Geophysical Research 82 (1977) 951-960.
• [5] Le Vine D. M., Journal of Geophysical Research 85 (1980) 4091-4095.
• [6] Beasley W. H., Uman M. A., Rustan P. L., Journal of Geophysical Research 87 (1982) 4883-4902.
• [7] Cooray V., Journal of Atmospheric and Terrestrial Physics 48(1) (1986) 73-78.
• [8] Willett J. C., Bailey J. C., Leteinturier C., Krider E. P., Journal of Geophysical Research 95(D12) (1990) 20367-20387.
• [9] Labaune G., Richard P., Bondiou A., 1990. Electromagnetic properties of lightning channels formation and propagation. In: Gardner R L (Ed.), Lightning electromagnetics. New York: Hemisphere.
• [10] Shao X. M., Rhodes C. T., Holden D. N., Journal of Geophysical Research 104 (1999) 9601-9608.
• [11] Cooray V., Pérez H., Journal of Geophysical Research 99 (1994) 10633-10640.
• [12] Jayaratne K. P. S. C., Cooray V., Journal of Atmospheric and Terrestrial Physics 56(4) (1994) 493-501.
• [13] Mäkelä J. S., Edirisinghe M., Fernando M., Montaño R., Cooray V., Journal of Atmospheric and Solar-Terrestrial Physics 69(1) (2007) 707-720.
• [14] Edirisinghe M., Mäkelä J. S., Montaño R., Fernando M., Cooray V., 2006 Signatures of the Lightning HF Radiations at 10 MHz, 5 MHz and 3 MHz associated with Leader and Return Stroke Process, Proceedings of the 28th International Conference on Lightning Protection, Kanazawa, Japan pp. 127-131.
• [15] Krider E. P., Radda G. J., Journal of Geophysical Research 80 (1975) 2653-2657.
• [16] Kitagawa N., On the electric field changes due to the leader processes and some of their discharge mechanism, Pap. Meteorol. Geophys. (Tokyo), 7 (1957) 400-414.
• [17] Cooray V., Lundquist S., Journal of Geophysical Research 90 (1985) 6099-6109.
• [18] Krider E. P., Radda G. J., Noogle R. C., Journal of Geophysical Research 80 (1975) 3801-3804.