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Long recovery VLF perturbations associated with lightning discharges

Salut, M.M. and Abdullah, M. and Graf, K.L. and Cohen, M.B. and Kumar, Sushil (2012) Long recovery VLF perturbations associated with lightning discharges. Journal of Geophysical Research (Space Physics), 117 (A08311). pp. 1-6. ISSN 0148-0227

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      Abstract

      Long D-region ionospheric recovery perturbations are a recently discovered and poorly understood subcategory of early VLF events, distinguished by exceptionally long ionospheric recovery times of up to 20 min (compared to more typical �1 min recovery times). Characteristics and occurrence rates of long ionospheric recovery events on the NWC transmitter signal recorded at Malaysia are presented. 48 long recovery events were observed. The location of the causative lightning discharge for each event is determined from GLD360 and WWLLN data, and each discharge is categorized as being over land or sea. Results provide strong evidence that long recovery events are attributed predominately to lightning discharges occurring over the sea, despite the fact that lightning activity in the region is more prevalent over land. Of the 48 long recovery events, 42 were attributed to lightning activity over water. Analysis of the causative lightning of long recovery events in comparison to all early VLF events reveals that these long recovery events are detectable for lighting discharges at larger distances from the signal path, indicating a different scattering pattern for long recovery events.

      Item Type: Journal Article
      Subjects: Q Science > QC Physics
      Divisions: Faculty of Science, Technology and Environment (FSTE)
      Depositing User: Sushil Kumar
      Date Deposited: 17 Sep 2012 14:42
      Last Modified: 18 Jan 2017 12:38
      URI: http://repository.usp.ac.fj/id/eprint/5286
      UNSPECIFIED

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