Energization of ionospheric ions by electrostatic hydrogen cyclotron waves

Singh, Nagendra; Schunk, R. W.; Sojka, J. J.

doi:10.1029/gl008i012p01249

Cited by 53 publications

(24 citation statements)

References 16 publications

(28 reference statements)

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“…The threshold criterion for this to happen is similar to (15), except that Karney [1978] estimated dth ~ 114. Our numerical calculations [Singh et al, 1981[Singh et al, , 1982b are in good agreement with this threshold value.…”

Section: Interaction Of Charge Particles With a Coherent W Avesupporting

confidence: 77%

“…On the other hand, it underestimates the heating of light ions when cyclotron resonance effects are present. In the absence of cyclotron resonances, (18) is valid even for light ions [Singh et al, 1981[Singh et al, ,1982b.…”

Section: Interaction Of Charge Particles With a Coherent W Avementioning

confidence: 99%

“…The observation of a strong correlation between EHC waves and H+ ion beams [Kintner et al, 1979] suggests that the additional transverse acceleration of heavy ions is caused by the interaction of these ions with the EHC waves. Papadopoulos et al [1980] and Singh et al [1981Singh et al [ , 1982b have shown that such an interaction can be very effective in the energization of the ions, depending on their mass. The purpose of the present paper is to examine critically the energetics of UFI events in view of the theory of the interaction of a single coherent EHC wave with 0+, He+, and H+ ions.…”

Section: Introductionmentioning

confidence: 99%

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Preferential perpendicular acceleration of heavy ionospheric ions by interactions with electrostatic hydrogen cyclotron waves

Singh

Schunk²,

Sojka

1983

J. Geophys. Res.

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The energization of heavy ionospheric ions by electrostatic hydrogen cyclotron (EHC) waves is examined. In particular. the problem of preferential perpendicular acceleration of heavy ions above 5000 km along auroral field lines is examined critically. Observations have indicated that above this altitude the occurrences of ion beams and EHC waves are highly correlated and that the occurrence rates are high. The EHC waves are found to be coherent. The energization process is examined in the light of interactions of a single coherent wave with the ions. The interactions can be stochastic or nonstochastic. depending on the parameters of the wave and of the background H + ions supporting the wave. With electric field wave amplitudes of a few tens of m V 1m. it is shown that the interaction can give perpendicular energies of the order of ke V for 0 + ions. He+ ions are shown to gain perpendicular energies smaller than 0 + ions. It is indicated that upward flowing H + ions cannot gain any appreciable amount of perpendicular energy. For a given electric field wave amplitude Eo. the extent of energization critically depends on the average perpendicular energy (temperature) W.lB of the background H + ion plasma. Examples are worked out for values of W.lB ranging from 1 to 200 eV. The resulting energizations and pitch angles for 0+ and He+ ions are compared with observations from satellites. The heating times for the ions are found to be of the order of 2 s at an altitude of 5000 km.

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Section: Interaction Of Charge Particles With a Coherent W Avesupporting

confidence: 77%

Section: Interaction Of Charge Particles With a Coherent W Avementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preferential perpendicular acceleration of heavy ionospheric ions by interactions with electrostatic hydrogen cyclotron waves

Singh

Schunk²,

Sojka

1983

J. Geophys. Res.

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“…By contrast, the waves considered above are electrostatic waves propagating almost perpendicular to the magnetic Ðeld. The ion heating by oblique electrostatic waves has been thoroughly discussed in the literature (see, e.g., Palmadesso et al 1974 ;Smith & Kaufman 1975 ;Fukuyama et al 1977 ;Abe, Momota, & Itatani 1980 ;Lysak, Hudson, & Termerin 1980 ;Singh, Schunk, & Sojka 1981 ;Ashour-Abdalla & Okuda 1984). Nevertheless, it is worth pointing out the relationship between these two limiting cases.…”

Section: Resonant Wave-particle Interactionmentioning

confidence: 99%

Generation of Ion Cyclotron Waves in Coronal Holes by a Global Resonant Magnetohydrodynamic Mode

Markovskii

2001

ApJ

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The damping of ion cyclotron waves is a process that can provide e †ective coronal heating and solar wind acceleration. However, the mechanism of generation of these waves in the solar corona remains unclear. We suggest that the ion cyclotron waves in coronal holes are excited by plasma instability that is driven by current Ñuctuations of a global resonant magnetohydrodynamic (MHD) mode. The frequency of the MHD mode is much lower than the proton gyrofrequency, so that its direct cyclotron damping is absent. At the same time, this frequency must be high enough to e †ectively generate the instability. We discuss the sources of such MHD waves in the coronal holes. The generated ion cyclotron waves are highly oblique with respect to the background magnetic Ðeld. We present qualitative arguments that these waves contribute to coronal heating and solar wind acceleration in a manner similar to that of the parallel-propagating waves usually used to explain the heating and acceleration. The scales of spatial inhomogeneity suggested by the observations and the amplitudes of the magnetic Ðeld Ñuctuations put limitations on the currents associated with MHD waves. We show that even with these limitations the current can still be large enough to drive the instability.

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“…acceleration by ES ion cyclotron waves (Palmadesso et al, 19714;Lysak et al, 1980;Papadopoulos et al, 1980;Dusenbery and Lyons, 1981;Singh, 1981; Ashour- Okuda and Ashour-Abdalla, 1981), acceleration by ES lower hybrid (LH) waves (Chang and Coppi, 1981), and acceleration by narrow oblique potential jumps (Yang and Kan, 1983;Greenspan and Whipple, 1982).…”

Section: Introductionmentioning

confidence: 99%