Aspects of wave-particle interactions at mid-latitudes

Smith, A. J.

doi:10.1016/0273-1177(95)00716-r

Cited by 5 publications

(1 citation statement)

References 38 publications

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“… Dowden and Adams [1989] found strong diffraction regions caused by patches less than 50 km wide in latitude, although considerably more in longitude. Similarly, Smith et al [1993] and Smith [1996] used Trimpi signatures observed in the Antarctic Peninsula region to infer perturbed regions of the ionosphere with dimensions of 50 km latitudinally and 200–300 km longitudinally. Poulsen et al [1993] suggested the need for ionospheric disturbances of radius 50–200 km in order to scatter a measureable signal.…”

Section: Introductionmentioning

confidence: 99%

Determining the size of lightning‐induced electron precipitation patches

et al. 2002

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We analyze Trimpi signatures during 23 and 24 April 1994 at four sites on or near the Antarctic Peninsula (Palmer, Faraday, Rothera, and Halley) on subionospheric VLF signals received from four U.S. naval transmitters (NAA, NSS, NLK, and NPM). Electron precipitation patches are found to be large, i.e., ∼1500 km × 600 km, with the longer axis orientated east‐west. Calculations using a three‐dimensional Born scattering model, where patch densities are 1.5 electrons cm−3 above ambient at the center at ∼84 km altitude, provides results that are consistent with this picture. A high proportion (38%) of the Trimpi events were associated with strong lightning flashes in eastern United States. When lightning discharges had currents >65 kA (positive or negative), there was a >80% chance of seeing an associated Trimpi event. The chance of seeing any Trimpi events fell to near zero for discharges of <45 kA. The largest Trimpi perturbations occur when the center of the precipitation patch is 700–800 km from the receivers. This result is consistent with the modeling calculations for large patches. The equatorward edge of the precipitation patch was estimated to be at ∼60°S, close to the magnetic conjugate of the lightning. The close association of the equatorward edge of the precipitation patch with the conjugate location of the causative lightning is consistent with a quasi‐ducted whistler‐induced precipitation mechanism. Nonducted whistler‐induced precipitation mechanisms would predict a 5°–10° latitudinal gap between the lightning and the equatorward edge of the patch. However, the lack of observed whistlers at the time of the Trimpi events is consistent with the nonducted whistler mechanism and is not consistent with the quasi‐ducted mechanism, although the distances from duct exit point to receiver may have been too large (∼700–1000 km) for the signals to be detectable. Using the significantly larger patch dimensions determined in this study, it is estimated that lightning may well be 10–100 times more effective at depleting the radiation belts than hiss.

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Section: Introductionmentioning

confidence: 99%

Determining the size of lightning‐induced electron precipitation patches

et al. 2002

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Numerical simulation of LEP Trimpis observed at Poitiers, France, on signals from VLF transmitters

Poussard

Corcuff

2000

Journal of Atmospheric and Solar-Terrestrial Physics

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On the numerical modelling of the VLF Trimpi effect

Nunn¹

1997

Journal of Atmospheric and Solar-Terrestrial Physics

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Abstract-This work is concerned with the numerical modelling of the well known Trimpi effect, in which transient perturbations of amplitude and phase appear in subionospheric VLF transmissions. These perturbations are due to scattering from night-time D region irregularities or LIE's (localised ionisation enhancements), which result from electron density increases due to precipitation from lightning whistlers.

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Aspects of wave-particle interactions at mid-latitudes

Cited by 5 publications

References 38 publications

Determining the size of lightning‐induced electron precipitation patches

Determining the size of lightning‐induced electron precipitation patches

Numerical simulation of LEP Trimpis observed at Poitiers, France, on signals from VLF transmitters

On the numerical modelling of the VLF Trimpi effect

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