Lightning-induced electron precipitation

Voss, H. D.; Imhof, W. L.; Walt, M.; Mobilia, J.; Gaines, E. E.; Reagan, J. B.; Inan, U. S.; Helliwell, R. A.; Carpenter, D. L.; Katsufrakis, J. P.; Chang, Hsing-Yin

doi:10.1038/312740a0

Cited by 155 publications

(105 citation statements)

References 18 publications

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“…The lightning whistler causes the lightning-induced electron precipitations (LEP) due to the wave-particle interactions around the magnetic equator (e.g., Rycroft, 1973;Voss et al, 1984). These energetic particle precipitations cause the ionospheric perturbations in the D/E region and are detected as amplitude/phase changes of the VLF transmitter signals so-called classical Trimpi events (Helliwell et al, 1973) but each classical Trimpi event does not last for a very long time (e.g ∼ 100 s recovery time) and may not cause significant changes in our statistical parameters.…”

Section: Discussionmentioning

confidence: 99%

Sub-ionospheric VLF signal anomaly due to geomagnetic storms: a statistical study

et al. 2015

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Abstract. We investigate quantitatively the effect of geomagnetic storms on the sub-ionospheric VLF/LF (Very Low Frequency/Low Frequency) propagations for different latitudes based on 2-year nighttime data from Japanese VLF/LF observation network. Three statistical parameters such as average signal amplitude, variability of the signal amplitude, and nighttime fluctuation were calculated daily for 2 years for 16-21 independent VLF/LF transmitter-receiver propagation paths consisting of three transmitters and seven receiving stations. These propagation paths are suitable to simultaneously study high-latitude, low-mid-latitude and midlatitude D/E-region ionospheric properties. We found that these three statistical parameters indicate significant anomalies exceeding at least 2 times of their standard deviation from the mean value during the geomagnetic storm time period in the high-latitude paths with an occurrence rate of anomaly between 40 and 50 % presumably due to the auroral energetic electron precipitation. The mid-latitude and lowmid-latitude paths have a smaller influence from the geomagnetic activity because of a lower occurrence rate of anomalies even during the geomagnetically active time period (from 20 to 30 %). The anomalies except geomagnetic storm periods may be caused by atmospheric and/or lithospheric origins. The statistical occurrence rates of ionospheric anomalies for different latitudinal paths during geomagnetic storm and non-storm time periods are basic and important information not only to identify the space weather effects toward the lower ionosphere depending on the latitudes but also to separate various external physical causes of lower ionospheric disturbances.

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Section: Discussionmentioning

confidence: 99%

Sub-ionospheric VLF signal anomaly due to geomagnetic storms: a statistical study

et al. 2015

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“…The Stimulated Emissions of Energetic Particles (SEEP) investigation on the S81-1 spacecraft provided the first satellite measurements of lightning-induced electron precipitation (LEP) [Voss et al, 1984]. SEEP observed short bursts of electrons in the bounce loss cone [cf.…”

Section: Introductionmentioning

confidence: 99%

Lightning‐induced energetic electron flux enhancements in the drift loss cone

Blake¹,

Inan²,

Walt³

et al. 2001

J. Geophys. Res.

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Abstract. With its relatively low altitude (520 x 670 km) orbit, SAMPEX is mostly below the stable trapping region where charged particles repeatedly drift around the Earth, especially at midlatitudes. Recent analyses of SAMPEX data have revealed a surprisingly common set of observations of enhanced energetic (>150 keV) electron fluxes at L < 3, during times when SAMPEX was located such that any electrons that it observed were in the drift loss cone (and were thus destined to be precipitated upon reaching

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“…The motions of energetic electrons are adversely affected by the wave fields which scatter some of them into loss cones (Helliwell et al, 1973). Induced electron precipitation (Voss et al, 1984;Arnoldy and Kintner, 1989;Imhof et al, 1994;Pradipta et al, 2007) by whistler waves has been observed. The Doppler shifted electron cyclotron resonance interaction (Kennel and Petschek, 1966;Villalon and Burke, 1991;Albert, 2000) has been suggested to be a likely electron precipitation mechanism.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of energetic electrons in the magnetosphere by amplified whistler wave under double cyclotron resonances

Kuo

2008

Nonlin. Processes Geophys.

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Abstract. An optimal approach reducing the population of MeV electrons in the magnetosphere is presented. Under a double resonance condition, whistler wave is simultaneously in cyclotron resonance with keV and MeV electrons. The injected whistler waves is first amplified by the background keV electrons via loss-cone negative mass instability to become effective in precipitating MeV electrons via cyclotron resonance elevated chaotic scattering. The numerical results show that a small amplitude whistler wave can be amplified by more than 25 dB. The amplification factor reduces only about 10 dB with a 30 dB increase of the initial wave intensity. Use of an amplified whistler wave to scatter 1.5 MeV electrons from an initial pitch angle of 86.5 • to a pitch angle <50 • is demonstrated. The ratio of the required wave magnetic field to the background magnetic field is calculated to be about 8×10 −4 .

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Lightning-induced electron precipitation

Cited by 155 publications

References 18 publications

Sub-ionospheric VLF signal anomaly due to geomagnetic storms: a statistical study

Sub-ionospheric VLF signal anomaly due to geomagnetic storms: a statistical study

Lightning‐induced energetic electron flux enhancements in the drift loss cone

Mitigation of energetic electrons in the magnetosphere by amplified whistler wave under double cyclotron resonances

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