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Local and Statistical Maps of LightningGenerated Wave Power Density Estimated at the Van Allen Probes Footprints From the WorldWide Lightning Location Network Database
Author  Ripoll, J.F.; Farges, T.; Lay, E.; Cunningham, G.; 
Keywords  drift wave power density; lightning power density; lightninggenerated waves; occurrence rate; Radiation belts; Van Allen Probes; WWLLN database 
Abstract  We propose a new method that uses the WorldWide Lightning Location Network (WWLLN) to estimate both the local and the drift lightning power density at the Van Allen Probes footprints during 4.3 years (~2 \texttimes 108 strokes.). The ratio of the drift power density to the local power density defines a timeresolved WWLLNbased model of lightninggenerated wave (LGW) power density ratio, RWWLLN. RWWLLNis computed every ~34 s. This ratio multiplied by the timeresolved LGW intensity measured by the Probes allows direct computation of pitch angle diffusion coefficients used in radiation belt codes. Statistical analysis shows the median power density ratio is urn:xwiley:00948276:media:grl58808:grl58808math0001 over the Americas. Elsewhere, urn:xwiley:00948276:media:grl58808:grl58808math0002 in general. Over oceans, urn:xwiley:00948276:media:grl58808:grl58808math0003 is larger than ~10. urn:xwiley:00948276:media:grl58808:grl58808math1003 varies with season, urn:xwiley:00948276:media:grl58808:grl58808math0083 ~ 2.5 from winter to summer. The yearlymedian urn:xwiley:00948276:media:grl58808:grl58808math0004 decays as urn:xwiley:00948276:media:grl58808:grl58808math0005. The strong geographical and temporal variation should be kept in assessing effects in space. RWWLLN > 1 suggests significant LGW effects in the inner belt. 
Year of Publication  2019 
Journal  Geophysical Research Letters 
Volume  46 
Number of Pages  41224133 
Section  
Date Published  03/2019 
ISBN  
URL  https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018GL081146 
DOI  10.1029/2018GL081146 