Search for oblique Whistler waves using solar orbiter data

<p>Whistler waves are thought to play an important role on the evolution of the electron distribution function as a function of distance. In particular, oblique whistler waves may diffuse the Strahl electrons &#160;into the halo population. &#160;Using AC magnetic field from the RPW/SCM (search coil magnetometer) of Solar Orbiter, we search for the presence of oblique Whistler waves in the frequency range between 3 Hz and 128 Hz . &#160;We perform a minimum variance analysis of the SCM data in combination with the MAG (magnetometer) data to determine the inclination of the waves with respect to the ambiant magnetic field. As the emphasis is placed on the search for oblique whistler, we also analyze the RPW electric field data and the evolution of the electron distribution function during these Whistler events.</p>

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Generalized Electron Cyclotron Resonance in Weakly Ionized Time-Varying Magnetoplasmas

Zeitschrift für Naturforschung A ◽

10.1515/zna-1969-0408 ◽

1969 ◽

Vol 24 (4) ◽

pp. 555-559 ◽

Cited By ~ 1

Author(s):

Wolfgang Stiller ◽

Günter Vojta

Keyword(s):

Magnetic Field ◽

Distribution Function ◽

Cyclotron Resonance ◽

Electron Distribution ◽

Electron Cyclotron Resonance ◽

Electron Distribution Function ◽

Resonance Phenomenon ◽

Alternating Electric Field ◽

Special Cases ◽

Weakly Ionized

Abstract The electron distribution function is calculated explicitly for a weakly ionized plasma under the action of an alternating electric field E = {0 , 0 , Eoz cos ω t} and a circularly polarized magnetic field BR = Bc{cos ωB t, sin ωB t, 0} rotating perpendicular to the a.c. field. Furthermore, a constant magnetic field B0 = {0, 0, B0} is taken into account. The isotropic part f0 of the electron distribution function which contains, in special cases, well-known standard distributions (distributions of Druyvensteyn, Davydov, Margenau, Allis, Fain, Gurevic) shows a resonance behaviour if the frequencies ω, ωc = (q/m) Bc , ω0 = (q/m) B0 , and ωB satisfy the relation ω= This can be understood as a generalized cyclotron resonance phenomenon.

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A note on the semi-Lagrangian formulation of the Vlasov equation

Journal of Plasma Physics ◽

10.1017/s0022377800004864 ◽

1970 ◽

Vol 4 (1) ◽

pp. 143-144

Author(s):

G. J. Lewak

Keyword(s):

Magnetic Field ◽

Distribution Function ◽

Electric Field ◽

Vlasov Equation ◽

Electron Distribution ◽

Electron Distribution Function ◽

Lagrangian Formulation ◽

Number Density ◽

Density Of Electrons ◽

Image Position

In a previous paper [Lewak (1969), see also Pflrsch (1966) for related treatment], it was shown that the Vlasov equation in the Semi-Lagrangian (S.L.) formulation, may be written in a form resembling the fluid equations.plus Maxwell's equations with the source terms given bywhere n is the determinant of the tensor Tij = ∂gi/∂ζj, and N is the constant mean number density of electrons. The averaging notation < > here is defined bywhere f(σ) is the electron distribution function to be specified. The equations assume for simplicity a uniform fixed ion background, although this is not a necessary restriction and equations (1) and (2) need only an obvious modification to account for ions. The force fields in (1) are related to the electric field E and magnetic field B in the plasma by .

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