Auroral hiss: a review

Sazhin, Sergei; Bullough, K.; Hayakawa, M.

doi:10.1016/0032-0633(93)90045-4

Cited by 80 publications

(54 citation statements)

References 122 publications

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“…Sazhin et al, 1993;Andre, 1997;LaBelle and Treumann, 2002). A large number of early ground-based observations confirmed connection of auroral hiss with the visible aurora and with the substorm magnetic disturbances.…”

Section: Introductionmentioning

confidence: 78%

The relationship between auroral hiss at high altitudes over the polar caps and the substorm dynamics of aurora

et al. 2005

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Abstract. Strong variations of intensity and cutoff frequency of the auroral hiss were observed by INTERBALL-2 and PO-LAR satellites at high altitudes, poleward from the auroral oval. The hiss intensifications are correlated with the auroral activations during substorms and/or pseudo-breakups. The low cutoff frequency of auroral hiss increases with the distance between the aurora and the satellite footprint. Multicomponent wave measurements of the hiss emissions on board the POLAR spacecraft show that the horizontal component of the Poynting flux of auroral hiss changes its direction in good accordance with longitudinal displacements of the bright auroras. The vertical component of the Poynting flux is directed upward from the aurora region, indicating that hiss could be generated by upgoing electron beams. This relationship between hiss and the aurora dynamics means that the upgoing electron beams are closely related to downgoing electron beams which produce the aurora. During the auroral activations the upgoing and downgoing beams move and change their intensities simultaneously.

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Section: Introductionmentioning

confidence: 78%

The relationship between auroral hiss at high altitudes over the polar caps and the substorm dynamics of aurora

et al. 2005

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“…According to their characteristics, these emissions are often classified as auroral hiss, saucers, chorus, and lower hybrid waves, all of which are often generated in the whistler mode (see André, 1997, and references therein). Auroral hiss can be generated by upward or downward moving electrons, and it can propagate both upwards and downwards from the region where it has been generated (Maggs, 1976;Sazhin et al, 1993). Saucers are often generated by upward moving field-aligned electrons in the return current region (Lönnqvist et al, 1993).…”

Section: Waves Around the Lower Hybrid Frequencymentioning

confidence: 99%

A statistical study of ion energization at 1700 km in the auroral region

et al. 2002

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Abstract. We present a comprehensive overview of several potentially relevant causes for the oxygen energization in the auroral region. Data from the Freja satellite near 1700 km altitude are used for an unconditional statistical investigation. The data are obtained in the Northern Hemisphere during 21 months in the declining phase of the solar cycle. The importance of various wave types for the ion energization is statistically studied. We also investigate the correlation of ion heating with precipitating protons, accelerated auroral electrons, suprathermal electron bursts, the electron density variations, K p index and solar illumination of the nearest conjugate ionosphere. We find that sufficiently strong broadband ELF waves, electromagnetic ion cyclotron waves, and waves around the lower hybrid frequency are foremost associated with the ion heating. However, magnetosonic waves, with a sharp, lower frequency cutoff just below the proton gyrofrequency, are not found to contribute to the ion heating. In the absence of the first three wave emissions, transversely energized ions are rare. These wave types are approximately equally efficient in heating the ions, but we find that the main source for the heating is broadband ELF waves, since they are most common in the auroral region. We have also observed that the conditions for ion heating are more favourable for smaller ratios of the spectral densities S E /S B of the broadband ELF waves at the oxygen gyrofrequency.

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“…It is often detected by low-orbiting satellites, rockets and ground-based stations (see [1,2] and references therein). Auroral hiss is usually observed in the ionosphere in the form of intense quasi-electrostatic whistler-mode waves with short wavelengths, i.e., wave vectors making large angles with the geomagnetic field.…”

Section: Introductionmentioning

confidence: 99%

Propagation of lower hybrid resonance waves in depleted-plasma regions in the upper auroral ionosphere

Pasmanik

Демехов

Trakhtengerts

et al. 2009

Radiophys Quantum El

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We study theoretically the propagation of lower-hybrid resonance (LHR) waves in the auroral ionospheric plasma. The ray-tracing technique is used to study the properties of LHR wave propagation with account of a large-scale inhomogeneity both along and across the geomagnetic field. It is shown that wave refraction in such an inhomogeneous medium can result in direct transformation of LHR waves whose wave normals make large angles with the geomagnetic field into whistler-mode waves, whose wave vectors are close to the geomagnetic-field direction and which can therefore pass through the ionosphere to the ground. The parameters of LHR waves which can thus be transformed into whistler-mode waves are found. The transformation process considered can be important for interpreting ground-based observations of ELF waves.

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Auroral hiss: a review

Cited by 80 publications

References 122 publications

The relationship between auroral hiss at high altitudes over the polar caps and the substorm dynamics of aurora

The relationship between auroral hiss at high altitudes over the polar caps and the substorm dynamics of aurora

A statistical study of ion energization at 1700 km in the auroral region

Propagation of lower hybrid resonance waves in depleted-plasma regions in the upper auroral ionosphere

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