Flare Energy Conversion due to Direct Electric Fields Resulting from the Sheared Reconnection

Details Flare Energy Conversion due to Direct Electric Fields Resulting from the Sheared Reconnection Flare Energy Conversion due to Direct Electric Fields Resulting from the Sheared Reconnection

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..369..477h&link_type=abstract

New Solar Physics with Solar-B Mission ASP Conference Series, Vol. 369, proceedings of the conference held 8-11 November, 2005 a

Physics

Scientific paper

We propose a new mechanism of the main energy conversion of the solar flare. Since a flare inducing prominence (flux tube) rises below V_{z} ≤ 300 km s^{-1}, lasting plasma ejections with Alfvén speeds of 3000 km s^{-1} are impossible, requiring to discard the slow shock mechanism.
In a reconnecting morphology, we assume a magnetic component parallel to the photospheric neutral line, i.e. sheared fields B_{y}. Then Gauss's law leads to non-zero electric charges σ: 4π σ = div(E}_{⊥}+ {E}_{∥}) = -div(V×B/c) ≈ B_{y} partial V_{z}/c partial x where the horizontal inflow velocity V_{x} change to vertical down-flow V_{z} (e.g. B_{y} ≈ B_{z} = 40 G and Δ x ≈ 10^{4} km). Field-aligned electric fields E_{∥} from Coulomb law using this σ are far greater than the Dreicer field (div{E}_{∥} = 0 holds), and accelerate electrons and protons. Thus the horizontally inflowing Poynting energy flux in area S_{x} are immediately converted to the kinetic energy of electron beams along the magnetic field in area S_{z}; V_{x}B^{2}S_{x}/4 π = m_{e}(nV^{3})_{beam}S_{z}/2 (S_{x}/S_{z} ≈ 3). The total energy can be supplied by 10 keV electrons and n_{beam} = 2×10^{7} cm^{-3} for V_{x} = 40 km s^{-1}, which ensures the short flare duration.

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