Polarization of ELF waves generated during “beat-wave” heating experiment near cutoff frequency of the Earth-ionosphere waveguide

Fedorenko, Yu. V.; Tereshchenko, E. D.; Pilgaev, S. V.; Grigoryev, V. M.; Blagoveshchenskaya, N. F.

doi:10.1002/2013rs005336

Cited by 34 publications

(24 citation statements)

References 25 publications

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“…The noise level of the receiver is about of 10 −14 nT 2 Hz −1 . The method for receiver calibration is described in Fedorenko et al (2014). Fast Fourier transform was carried out to calculate the power spectral densities of the magnetic field of VLF emissions (frequency-time dynamic spectra, or so-called spectrograms).…”

Section: Observations and Discussionmentioning

confidence: 99%

Ground‐Based Auroral Hiss Recorded in Northern Finland with Reference to Magnetic Substorms

Manninen¹,

Клейменова

Kozlovsky³

et al. 2020

Geophysical Research Letters

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Very low frequency (VLF) auroral hiss at Kannuslehto (KAN), Finland, was analyzed with reference to the progress of 98 isolated magnetic substorms measured during the winter months of 2015–2018. Of these, 91 were accompanied by auroral hiss during the substorm growth phase. No auroral hiss was recorded during the expansion and recovery phases. We found that auroral hiss was observed under rising polar cap (PC) index, showing an increased solar wind energy input into the magnetosphere during the substorm growth phase. We also found that in 58 of the 65 events studied, KAN was located in the vicinity of enhanced field‐aligned currents (FACs) during auroral hiss occurrence. For the first time, it was established that auroral VLF hiss generation in the equatorial part of the auroral oval is a typical signature of a substorm growth phase.

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Section: Observations and Discussionmentioning

confidence: 99%

Ground‐Based Auroral Hiss Recorded in Northern Finland with Reference to Magnetic Substorms

Manninen¹,

Клейменова

Kozlovsky³

et al. 2020

Geophysical Research Letters

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“…In addition, there is a vertical electric field sensor that can be used to remove the 180° ambiguity of propagation direction. Details of the LOZ hardware can be found in Fedorenko et al ().…”

Section: Datamentioning

confidence: 99%

Localization of the Source of Quasiperiodic VLF Emissions in the Magnetosphere by Using Simultaneous Ground and Space Observations: A Case Study

Демехов

Титова

Maninnen³

et al. 2020

JGR Space Physics

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We study quasiperiodic very low frequency (VLF) emissions observed simultaneously by Van Allen Probes spacecraft and Kannuslehto and Lovozero ground-based stations on 25 December 2015. Both Van Allen Probes A and B detected quasiperiodic emissions, probably originated from a common source, and observed on the ground. In order to locate possible regions of wave generation, we analyze wave-normal angles with respect to the geomagnetic field, Poynting flux direction, and cyclotron instability growth rate calculated by using the measured phase space density of energetic electrons. We demonstrate that even parallel wave propagation and proper (downward) Poynting flux direction are not sufficient for claiming observations to be in the source region. Agreement between the growth rate and emission bands was obtained for a restricted part of Van Allen Probe A trajectory corresponding to localized enhancement of plasma density with scale of 700 km. We employ spacecraft density data to build a model plasma profile and to calculate ray trajectories from the point of wave detection in space to the ionosphere and examine the possibility of their propagation toward the ground. For the considered event, the wave could propagate toward the ground in the geomagnetic flux tube with enhanced plasma density, which ensured ducted propagation. The region of wave exit was confirmed by the analysis of wave propagation direction at the ground detection point.

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“…A more detailed description of the instrument was given by Manninen []. The magnetic field intensities are calibrated using the method described by Fedorenko et al []. Fast Fourier transform (FFT) is performed to obtain power spectral densities of magnetic field fluctuations.…”

Section: Data Setmentioning

confidence: 99%

Conjugate observations of a remarkable quasiperiodic event by the low‐altitude DEMETER spacecraft and ground‐based instruments

Němec

Bezděková

Manninen³

et al. 2016

JGR Space Physics

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We present a detailed analysis of a long‐lasting quasiperiodic (QP) event observed simultaneously by the low‐altitude DEMETER spacecraft and on the ground by the instrumentation of the Sodankylä Geophysical Observatory, Finland. The event was observed on 26 February 2008. It lasted for several hours, and it was detected both in the Northern and Southern Hemispheres. The time intervals when the event was observed on board the satellite and/or on the ground provide us with an estimate of the event dimensions. When the event is detected simultaneously by the satellite and on the ground, the observed frequency‐time structure is generally the same. However, the ratio of detected intensities varies significantly as a function of the spacecraft latitude, indicating the wave guiding along the plasmapause. Moreover, there is a delay as large as about 13 s between the times when individual QP elements are detected by the spacecraft and on the ground. This appears to be related to the azimuthal separation of the instruments, and it is highly relevant to the identification of a possible source mechanism. We suggest that it is due to an azimuthally propagating ULF wave which periodically modulates the azimuthally extended source region. Finally, we find that at the times when the intensity of the QP event suddenly increases, there is a distinct increase of the amplitude of Alfvénic ULF pulsations measured on the ground at high latitudes. This might indicate that the source region is located at L shells larger than about 7.1.

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Polarization of ELF waves generated during “beat-wave” heating experiment near cutoff frequency of the Earth-ionosphere waveguide

Cited by 34 publications

References 25 publications

Ground‐Based Auroral Hiss Recorded in Northern Finland with Reference to Magnetic Substorms

Ground‐Based Auroral Hiss Recorded in Northern Finland with Reference to Magnetic Substorms

Localization of the Source of Quasiperiodic VLF Emissions in the Magnetosphere by Using Simultaneous Ground and Space Observations: A Case Study

Conjugate observations of a remarkable quasiperiodic event by the low‐altitude DEMETER spacecraft and ground‐based instruments

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