Radio wave dissipation in turbulent auroral plasma during the precipitation of energetic electrons

Mishin, E. V.; Lukjanova, L. N.; Makarenko, S. F.; Atamanjuk, B. M.

doi:10.1029/91rs02631

Cited by 5 publications

(3 citation statements)

References 13 publications

(6 reference statements)

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“…Anomalous collision processes have been commonly invoked elsewhere (e.g. Sudan, 1983;Robinson, 1986Robinson, , 1998Hamza, 1992;Mishin et al, 1992). The mechanisms involved vary, but the essential feature is that very short scale waves randomly scatter the electrons and eectively enhance the electron momentum loss rate.…”

Section: Discussionmentioning

confidence: 99%

The generation of non aspect sensitive plasma density irregularities by field aligned drifts in the lower ionosphere

Robinson

Schlegel

2000

Ann. Geophys.

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Abstract. A theory of the generation of plasma density irregularities with virtually no aspect sensitivity, in the lower ionosphere at high latitudes, by electron drifts aligned with the geomagnetic ®eld, is presented. The theory is developed through¯uid equations in which the destabilising mechanism involves positive feedback from electron collisional heating. When ®eld aligned electron drift speeds exceed a few km s , this eect destabilises waves with wavelengths in excess of a few tens of metres in the lower E-region, where collisional eects are suciently large. Furthermore, the threshold conditions are almost independent of the wave propagation direction and the unstable waves propagate at speeds well below the ion acoustic speed. The role that this new instability may play in recent radar backscatter observations of short scale irregularities propagating in directions close to that of the geomagnetic ®eld, in the lower E-region is also considered.

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Section: Discussionmentioning

confidence: 99%

The generation of non aspect sensitive plasma density irregularities by field aligned drifts in the lower ionosphere

Robinson

Schlegel

2000

Ann. Geophys.

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“…The conversion process dominates at γ conv > γ mi (w L ). Applying a similar procedure to the electromagnetic version of the Zakharov equation (e.g., Shapiro and Shevchenko, 1984), one can describe resonant scatter of radio waves on ion density oscillations (e.g., Mishin et al, 1992).…”

Section: Nonlinear Effectsmentioning

confidence: 99%

Artificial Aurora Experiments and Application to Natural Aurora

Mishin

2019

Front. Astron. Space Sci.

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A review is given of the effects observed during injections of powerful electron beams from sounding rockets into the upper atmosphere. Data come from in situ particle and wave measurements near a beam-emitting rocket and ground-based optical, wideband radiowave, and radar observations. The overall data cannot be explained solely by collisional degradation of energetic electrons but require collisionless beam-plasma interactions (BPI) be taken into account. The beam-plasma discharge theory describes the features of the region near a beam-emitting rocket, where the beam-excited plasma waves energize plasma electrons, which then ignite the discharge. The observations far beneath the rocket reveal a double-peak structure of artificial auroral rays, which can be understood in terms of the beam-excited strong Langmuir turbulence being affected by collisions of ionospheric electrons. This leads to the enhanced energization of ionospheric electrons in a narrow layer termed the plasma turbulence layer (PTL), which explains the upper peak. Similar double-peak structures or a sharp upper boundary in rayed auroral arcs have been observed in the auroral ionosphere by optical, radar, and rocket observations, and called Enhanced Aurora. A striking resemblance between Enhanced and Artificial Aurora altitude profiles indicates that they are created by the above BPI process which results in the PTL.

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“…It was shown that the energy density of Lungmuir waves, excited by precipitating electrons, can significantly increase in a rather thin layer, named the plasma turbulence layer (PTL). The altitude of the PTL depends on the of the PTL in the auroral ionosphere are discussed by andMishin et al [ , 1992.It is worth mentioning that without preheating by Lungmuir waves, the current-driven ion-acoustic instability can not develop for any reasonable field-aligned current magnitudes of (~ 2 x 10 -4 A/m 2 [e.g., Forme et al, 1993]. Thus beam-generated Lungmuir waves serve as the trigger for ion-acoustic waves in the PTL.…”

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confidence: 99%

On incoherent scatter plasma lines in aurorae

Мишин¹,

Schlegel²

1994

J. Geophys. Res.

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We consider a new mechanism for the generation of short‐scale, λ∥ ∼ 10 cm, electron density fluctuations giving rise to plasma line enhancements measured by incoherent scatter radars in the auroral E region. It is explained as a coupling (conversion) of long‐scale Langmuir waves generated by precipitated electron beams with short‐scale ion‐acoustic waves. The latter are supposed to be driven by field‐aligned currents associated with the precipitation. This mechanism is most effective inside the thin layer of the enhanced plasma turbulence, named the plasma turbulence layer.

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Radio wave dissipation in turbulent auroral plasma during the precipitation of energetic electrons

Cited by 5 publications

References 13 publications

The generation of non aspect sensitive plasma density irregularities by field aligned drifts in the lower ionosphere

The generation of non aspect sensitive plasma density irregularities by field aligned drifts in the lower ionosphere

Artificial Aurora Experiments and Application to Natural Aurora

On incoherent scatter plasma lines in aurorae

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