DEMETER observations of ELF waves injected with the HAARP HF transmitter

Platino, M.; Inan, U. S.; Bell, T. F.; Parrot, M.; Kennedy, Edward J.

doi:10.1029/2006gl026462

Cited by 37 publications

(41 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Those observational results indicate that some of these artificial ELF/VLF waves generated by ionospheric modulation can propagate directly upwards and penetrate through the ionosphere into the overlying magnetosphere (James et al, 1984), and others propagate within the Earth-ionosphere waveguide and leak up progressively with each reflection off the ionosphere Platino et al, 2006). The wave intensity detected by the groundbased receiver or by the spacecraft instrument is generally at a magnitude of a few pT.…”

Section: S S Chang Et Al: Resonant Scattering Of Energetic Electronsmentioning

confidence: 98%

“…1, when ELF/VLF waves are generated as a result of periodic modulation of the ionospheric currents by HF heating (Ferraro et al, 1982;Barr and Stubbe, 1991;Inan et al, 2004;Platino et al, 2006;Piddyachiy et al, 2008), some waves propagate directly upwards and others propagate within the Earth-ionosphere waveguide and leak up progressively with each reflection off the ionosphere (James et al, 1984;Inan et al, 2004;Platino et al, 2006;Piddyachiy et al, 2008). Subsequently, these leaked waves propagate outwards and encounter energetic electrons that can potentially undergo resonant wave-particle interactions.…”

Section: Ray Tracing Simulations Of Elf/vlf Waves Generated By Modulamentioning

confidence: 99%

“…When the ELF/VLF waves reach the higher ionosphere, at the altitudes ≥ 120 km in this study, the geometric optics theory is valid, and numerical ray tracing simulations are a good technique to determine the ray paths of the whistler-mode artificial waves. Actually, previous studies have performed ray tracing to simulate the propagation path of artificial ELF/VLF signals generated by heating the ionosphere (James et al, 1984;Platino et al, 2006) or by ground-based or satellite-based ELF/VLF transmitters Kulkarni et al, 2008), and magnetospherically reflecting whistlers induced by lightning (Bortnik et al, , 2006aBortnik, 2005). The ray tracing program used for the present computations is similar to that described by Inan and Bell (1977) (including the geomagnetic filed and electron density model).…”

Section: Ray Tracing Simulations Of Elf/vlf Waves Generated By Modulamentioning

confidence: 99%

“…Generation of extremely low-frequency (ELF)/very lowfrequency (VLF) waves by modulated heating of the D region ionosphere in the presence of naturally forming ionospheric currents is by now a well-established technique (e.g., Ferraro et al, 1982;Barr and Stubbe, 1991;Inan et al, 2004;Platino et al, 2006;Piddyachiy et al, 2008;and references therein). Periodic heating of the ionospheric region with a high-frequency (HF) transmitter modulates the conductivity of the region and, in turn, modulates these naturally forming (and pre-existing) currents, constituting what amounts to a giant radiating antenna at ∼ 60-100 km altitude.…”

Section: Introductionmentioning

confidence: 99%

“…Periodic heating of the ionospheric region with a high-frequency (HF) transmitter modulates the conductivity of the region and, in turn, modulates these naturally forming (and pre-existing) currents, constituting what amounts to a giant radiating antenna at ∼ 60-100 km altitude. The natural current system can be the auroral electrojet modulated by High-Power Auroral Stimulation (HIPAS) or HighFrequency Active Auroral Research Program (HAARP) heating facilities Platino et al, 2006;Piddyachiy et al, 2008), or the equatorial dynamo current modulated by the Arecibo heating facilities (Ferraro et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Resonant scattering of energetic electrons in the plasmasphere by monotonic whistler-mode waves artificially generated by ionospheric modification

Chang

Bortnik

et al. 2014

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. Modulated high-frequency (HF) heating of the ionosphere provides a feasible means of artificially generating extremely low-frequency (ELF)/very low-frequency (VLF) whistler waves, which can leak into the inner magnetosphere and contribute to resonant interactions with highenergy electrons in the plasmasphere. By ray tracing the magnetospheric propagation of ELF/VLF emissions artificially generated at low-invariant latitudes, we evaluate the relativistic electron resonant energies along the ray paths and show that propagating artificial ELF/VLF waves can resonate with electrons from ∼ 100 keV to ∼ 10 MeV. We further implement test particle simulations to investigate the effects of resonant scattering of energetic electrons due to triggered monotonic/single-frequency ELF/VLF waves. The results indicate that within the period of a resonance timescale, changes in electron pitch angle and kinetic energy are stochastic, and the overall effect is cumulative, that is, the changes averaged over all test electrons increase monotonically with time. The localized rates of wave-induced pitch-angle scattering and momentum diffusion in the plasmasphere are analyzed in detail for artificially generated ELF/VLF whistlers with an observable in situ amplitude of ∼ 10 pT. While the local momentum diffusion of relativistic electrons is small, with a rate of < 10 −7 s −1 , the local pitchangle scattering can be intense near the loss cone with a rate of ∼ 10 −4 s −1 . Our investigation further supports the feasibility of artificial triggering of ELF/VLF whistler waves for removal of high-energy electrons at lower L shells within the plasmasphere. Moreover, our test particle simulation results show quantitatively good agreement with quasi-linear diffusion coefficients, confirming the applicability of both methods to evaluate the resonant diffusion effect of artificial generated ELF/VLF whistlers.

show abstract

Section: S S Chang Et Al: Resonant Scattering Of Energetic Electronsmentioning

confidence: 98%

Section: Ray Tracing Simulations Of Elf/vlf Waves Generated By Modulamentioning

confidence: 99%

Section: Ray Tracing Simulations Of Elf/vlf Waves Generated By Modulamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Resonant scattering of energetic electrons in the plasmasphere by monotonic whistler-mode waves artificially generated by ionospheric modification

Chang

Bortnik

et al. 2014

Ann. Geophys.

View full text Add to dashboard Cite

show abstract

Analysis of magnetospheric ELF/VLF wave amplification from the Siple Transmitter experiment

Spasojević

Harid

et al. 2014

JGR Space Physics

View full text Add to dashboard Cite

Controlled experiments with dedicated ground-based ELF/VLF (0.3-30 kHz) transmitters are invaluable in investigating nonlinear whistler mode wave-particle interactions in the Earth's magnetosphere.The most productive such experiment operated between 1973 and 1988 near L = 4 at Siple Station, Antarctica. A major effort has been undertaken to digitize and preserve a significant portion of the historical data set from the original magnetic tapes, and we describe here the data set and the processing techniques used to remove artifacts introduced during recording and playback. We analyze a commonly transmitted diagnostic format from 1986 and present statistics on the occurrence and properties of amplified ELF/VLF waves received by a ground-based receiver at the geomagnetic conjugate location to Siple at Lake Mistissini, Quebec. For the interval examined, only 11% of Siple transmissions are successfully received in the conjugate hemisphere with quiet geomagnetic conditions being significantly more conducive to successful reception. The total growth for the events examined is estimated to be 5-40 dB, and nonlinear growth rates are in the range of 20-350 dB/s. The observations show that as the nonlinear growth rate increases, the duration of nonlinear growth decreases. Significant linear correlation is found between the noise floor and the saturation level, with higher noise floors resulting from increases in natural magnetospheric emissions. Finally, we find a lack of correlation between the nonlinear growth rate and the noise, threshold, and saturation levels.

show abstract

Generation of whistler waves by continuous HF heating of the upper ionosphere

et al. 2016

Self Cite

View full text Add to dashboard Cite

Broadband VLF waves in the frequency range 7–10 kkHz and 15–19 kHz, generated by F region CW HF ionospheric heating in the absence of electrojet currents, were detected by the DEMETER satellite overflying the High Frequency Active Auroral Research Program (HAARP) transmitter during HAARP/BRIOCHE campaigns. The VLF waves are in a frequency range corresponding to the F region lower lybrid (LH) frequency and its harmonic. This paper aims to show that the VLF observations are whistler waves generated by mode conversion of LH waves that were parametrically excited by HF-pump-plasma interaction at the upper hybrid layer. The paper discusses the basic physics and presents a model that conjectures (1) the VLF waves observed at the LH frequency are due to the interaction of the LH waves with meter-scale field-aligned striations—generating whistler waves near the LH frequency; and (2) the VLF waves at twice the LH frequency are due to the interaction of two counterpropagating LH waves—generating whistler waves near the LH frequency harmonic. The model is supported by numerical simulations that show good agreement with the observations. The (Detection of Electromagnetic Emissions Transmitted from Earthquake Regions results and model discussions are complemented by the Kodiak radar, ionograms, and stimulated electromagnetic emission observations

show abstract

DEMETER observations of ELF waves injected with the HAARP HF transmitter

Cited by 37 publications

References 15 publications

Resonant scattering of energetic electrons in the plasmasphere by monotonic whistler-mode waves artificially generated by ionospheric modification

Resonant scattering of energetic electrons in the plasmasphere by monotonic whistler-mode waves artificially generated by ionospheric modification

Analysis of magnetospheric ELF/VLF wave amplification from the Siple Transmitter experiment

Generation of whistler waves by continuous HF heating of the upper ionosphere

Contact Info

Product

Resources

About