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Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields

Publication ,  Journal Article
Li, J; Cummer, SA; Lyons, WA; Nelson, TE
Published in: Journal of Geophysical Research Atmospheres
October 27, 2008

Simultaneous measurements of high-altitude optical emissions and magnetic fields produced by sprite-associated lightning discharges enable a close examination of the link between low-altitude lightning processes and high-altitude sprite processes. We report results of the coordinated analysis of high-speed sprite video and wideband magnetic field measurements recorded simultaneously at Yucca Ridge Field Station and Duke University. From June to August 2005, sprites were detected following 67 lightning strokes, all of which had positive polarity. Our data showed that 46% of the 83 discrete sprite events in these sequences initiated more than 10 ms after the lightning return stroke, and we focus on these delayed sprites in this work. All delayed sprites were preceded by continuing current moments that averaged at least 11 kA km between the return stroke and sprites. The total lightning charge moment change at sprite initiation varied from 600 to 18,600 C km, and the minimum value to initiate long-delayed sprites ranged from 600 for 15 ms delay to 2000 C km for more than 120 ms delay. We numerically simulated electric fields at altitudes above these lightning discharges and found that the maximum normalized electric fields are essentially the same as fields that produce short-delayed sprites. Both estimated and simulation-predicted sprite initiation altitudes indicate that long-delayed sprites generally initiate around 5 km lower than short-delayed sprites. The simulation results also reveal that slow (5-20 ms) intensifications in continuing current can play a major role in initiating delayed sprites. Copyright 2008 by the American Geophysical Union.

Duke Scholars

Published In

Journal of Geophysical Research Atmospheres

DOI

ISSN

0148-0227

Publication Date

October 27, 2008

Volume

113

Issue

20

Related Subject Headings

  • Meteorology & Atmospheric Sciences
 

Citation

APA
Chicago
ICMJE
MLA
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Li, J., Cummer, S. A., Lyons, W. A., & Nelson, T. E. (2008). Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields. Journal of Geophysical Research Atmospheres, 113(20). https://doi.org/10.1029/2008JD010008
Li, J., S. A. Cummer, W. A. Lyons, and T. E. Nelson. “Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields.” Journal of Geophysical Research Atmospheres 113, no. 20 (October 27, 2008). https://doi.org/10.1029/2008JD010008.
Li J, Cummer SA, Lyons WA, Nelson TE. Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields. Journal of Geophysical Research Atmospheres. 2008 Oct 27;113(20).
Li, J., et al. “Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields.” Journal of Geophysical Research Atmospheres, vol. 113, no. 20, Oct. 2008. Scopus, doi:10.1029/2008JD010008.
Li J, Cummer SA, Lyons WA, Nelson TE. Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields. Journal of Geophysical Research Atmospheres. 2008 Oct 27;113(20).

Published In

Journal of Geophysical Research Atmospheres

DOI

ISSN

0148-0227

Publication Date

October 27, 2008

Volume

113

Issue

20

Related Subject Headings

  • Meteorology & Atmospheric Sciences