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Local and statistical maps of lightning-generated wave power density estimated at the Van Allen Probes footprints from the World-Wide Lightning Location Network database

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2018GL081146· OSTI ID:1504656
 [1];  [1];  [2];  [2]
  1. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
We introduce a new method that uses the World-Wide 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 (~2x108 strokes.). The ratio of the drift power density to the local power density defines a time-resolved WWLLN-based model of lightning-generated wave (LGW) power density ratio, $$\mathcal{R_{WWLLN}}$$. $$\mathcal{R_{WWLLN}}$$ is computed every ~34s. This ratio multiplied by the time-resolved LGW intensity measured by the Probes allows direct computation of pitch angle diffusion coefficients used in radiation belts codes. According to Statistical analysis, the median power density ratio is $$\mathcal{\hat{R}_{WWLLN}}$$ = 0.3 - 4 over the Americas. Elsewhere, $$\mathcal{\hat{R}_{WWLLN}}$$ > 1 in general. Over oceans, $$\mathcal{\hat{R}_{WWLLN}}$$ is larger than ~10 and varies with season (x2.5 from winter to summer). The yearly median $$\mathcal{\hat{R}_{WWLLN}}$$ decays as $$\mathcal{\hat{R}_{WWLLN}}$$~9.9/L0.91. The strong geographical and temporal variation should be kept in assessing effects in space. $$\mathcal{R_{WWLLN}}$$> 1 suggests significant LGW effects in the inner belt.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1504656
Report Number(s):
LA-UR--19-21524
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: none Vol. 46; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
Heliospheric and Magnetospheric Physics
Lightning power
WWLLN database
density
drift wave power
lightning-generated waves
occurrence rate
radiation belts