Electron Energization by the Lower Hybrid Waves and Soft X-ray emission from the Different Space Environments: From Comets to Supernova Shocks

Details Electron Energization by the Lower Hybrid Waves and Soft X-ray emission from the Different Space Environments: From Comets to Supernova Shocks Electron Energization by the Lower Hybrid Waves and Soft X-ray emission from the Different Space Environments: From Comets to Supernova Shocks

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dpp.u9p10b&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 16-20, 1998 New Orleans, LA, abstract #U9P.10

Physics

Plasma Physics

Scientific paper

Electron acceleration by the lower-hybrid waves is a phenomenon well known in fusion studies (i.e. the so-called lower-hybrid driver[1]), and is also responsible for electron energization in many space environments, where the lower hybrid turbulence is of self generated type. It is produced by the modified two stream instability (MTSI) resulting from the mass-loading effect. i.e. contamination of the solar wind flow or interstellar plasma with the newly born ions. In the cometary case it is due to photoionization of the neutral gas outflow from the nucleus. In situ measurements at Haley Comet revealed the existence of very intensive lower hybrid wave turbulence inside the cometary bow-shock[2]. The quasi-linear theory of MTSI evolution constructed in this paper demonstrates a consistency of these wave measurements with the large fluxes of the energetic electrons also measured during the encounter with Haley Comet[3]. Energetic electrons penetrating along the magnetic field lines inside a dense cometary atmosphere produce soft x-ray by combination of Bremmstrahlung and line K-shell radiation of oxygen atoms. A similar mechanism can be used for the explanation of x-ray emission from supernova shocks. A counterstreaming ion population is created either by reflection of the part of interstellar plasma flow by MHD turbulence at the shock front or by shock driven ionization of interstellar gas clouds. Interaction of counter-streaming ion populations leads to the excitation of the lower hybrid waves by MTSI and subsequent electron energization. 1) Luckhardt S.C. et.al.Phys. Rev. Left. 48, 142 (1982). 2) Klimov S. et.al. Nature, 321, 292 (1986). 3) Gringaus, K.I. et.al. Astronomy and Astrophysics, 187, 287 (1987).

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