Thunderstorm characteristics deduced from fractal analysis and Q-bursts

Y. Hobara, K. Shirahata, M. Hayakawa, E. Williams, G. Sátori, C. Price

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The meteorological context for mesoscale lightning and the origin of ELF Q-bursts in Africa have been enabled by the MTT Doppler radar installed in Niamey, Niger in summer 2006 for the AMMA (African Monsoon and Multidisciplinary Activity). The radar measurements were supplemented with ground-based electrical and video camera observations. A large number of energetic lightning flashes have been documented in the laterally extensive stratiform regions of squall lines from MCS (Mesoscale Convective System). Some of these special flashes developed after the radar bright band was well developed in the stratiform region and generated large transient electromagnetic signals, or so-called ELF Q-bursts. GPS clocking of these events has enabled their search and identification at remote ELF stations all over the world. These identified flashes have a positive polarity in many cases with a charge moment change (CMC) sometimes ~ 3000 C km, sufficient for generating sprites. This expectation has been confirmed by the first ground-based observation of sprites over Africa. Fractal analysis has been applied to the radar data from African MCS to understand the meteorological conditions behind the local discharges, excitation of energetic Q-burst and sprites in Africa. Fractal dimension D f varies with the meteorological stages of MCS. D f of MCS in the bright band reaches about 2.0 indicating the self-organization of thunderstorms when most Q-bursts are generated.

Original languageEnglish
Title of host publicationTriSAI 2009 - Proceedings of Triangle Symposium on Advanced ICT 2009
Pages67-72
Number of pages6
Publication statusPublished - 2009
EventTriangle Symposium on Advanced ICT 2009, TriSAI 2009 - Tokyo, Japan
Duration: Oct 28 2009Oct 30 2009

Other

OtherTriangle Symposium on Advanced ICT 2009, TriSAI 2009
CountryJapan
CityTokyo
Period10/28/0910/30/09

Fingerprint

Thunderstorms
Lightning
Fractals
Radar
Radar measurement
Doppler radar
Antenna grounds
Video cameras
Fractal dimension
Global positioning system

ASJC Scopus subject areas

  • Information Systems

Cite this

Hobara, Y., Shirahata, K., Hayakawa, M., Williams, E., Sátori, G., & Price, C. (2009). Thunderstorm characteristics deduced from fractal analysis and Q-bursts. In TriSAI 2009 - Proceedings of Triangle Symposium on Advanced ICT 2009 (pp. 67-72)

Thunderstorm characteristics deduced from fractal analysis and Q-bursts. / Hobara, Y.; Shirahata, K.; Hayakawa, M.; Williams, E.; Sátori, G.; Price, C.

TriSAI 2009 - Proceedings of Triangle Symposium on Advanced ICT 2009. 2009. p. 67-72.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hobara, Y, Shirahata, K, Hayakawa, M, Williams, E, Sátori, G & Price, C 2009, Thunderstorm characteristics deduced from fractal analysis and Q-bursts. in TriSAI 2009 - Proceedings of Triangle Symposium on Advanced ICT 2009. pp. 67-72, Triangle Symposium on Advanced ICT 2009, TriSAI 2009, Tokyo, Japan, 10/28/09.
Hobara Y, Shirahata K, Hayakawa M, Williams E, Sátori G, Price C. Thunderstorm characteristics deduced from fractal analysis and Q-bursts. In TriSAI 2009 - Proceedings of Triangle Symposium on Advanced ICT 2009. 2009. p. 67-72
Hobara, Y. ; Shirahata, K. ; Hayakawa, M. ; Williams, E. ; Sátori, G. ; Price, C. / Thunderstorm characteristics deduced from fractal analysis and Q-bursts. TriSAI 2009 - Proceedings of Triangle Symposium on Advanced ICT 2009. 2009. pp. 67-72
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