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Published on October 29, 2007

Author: Gabrielle

Source: authorstream.com

Reconnection in the Solar Corona Probing the fundamental scales:  Reconnection in the Solar Corona Probing the fundamental scales Dana Longcope Montana State University Work supported by NASA, NSF & DoD Thanks: Mark Linton, NRL Driver: Photospheric Field:  Driver: Photospheric Field 00:00 12:00 00:00 12:00 Aug 10, 2001 Aug 11, 2001 00:00 MDI TRACE 171A 7:34 AR9574 AR9570 movie Emergence: (Longcope et al. 2005) Coronal Response:  Coronal Response Potential field: minimum energy state 0 Wpot W y(v) Flux y(v) interconn-ects new & old Ars increases - emerg’ce Estimating Coronal Response:  Estimating Coronal Response Constrain interconnecting flux  0 Wfce Wpot W DW I = 1.3 x 1011 Amps y(v)  ~ const. yy (v) =1021 Mx Minimum energy: FCE Reconn. dormant Equilibrium Current Sheet…:  Equilibrium Current Sheet… Far from CS: …gross structure determined by p-spheric field Quasi-static Evolution:  Quasi-static Evolution  I=88 GA I=42 GA I=5 GA No recon’ion Internal CS Structure…:  Internal CS Structure… *   … set by non-ideal effects* Sweet-Parker Reconnection outflows ~ 50 Mm = 4 months Instabilities:  Instabilities   Unstable:  > 2 1. Resistive Tearing (Furth et al. 1963) Instabilities:  Instabilities 1. Resistive Tearing (Furth et al. 1963) Stabilizing effects: Sweet-Parker flow (Phan & Sonnerup 1991) Para’ll comp. of B (3rd dimension) Nonlinear saturation (turbulence) Instab. enhances diffusion … drives CS to marginal stability  ~ 1000 Slide10:  c/wpi ri D Reconnection:  Reconnection Biernat et al. 1987 Localized in space & time Fast rec’n w/ slow shocks Creates reconnected loops  New CS forms in wake 2d Reconnection:  Reconnection Linton & Longcope 2006 3d Localized in space & time Fast rec’n w/ slow shocks Creates reconnected loops  New CS forms in wake Reconnection Observed:  Reconnection Observed reconnected loops  Q: How do loop diameters relate to ReX size? TRACE 171A Reconnection Observed:  Reconnection Observed reconnected loops  Q: How do loop diameters relate to ReX size? A: Not Simply Slide15:  c/wpi ri RAM TRACE Summary: Current Sheets:  Summary: Current Sheets Global structure: Set by p-spheric field can be estimated today (~ 30 Mm) Internal structure: set by non-ideal effects (i.e. ) reconnection: will occur on internal scales - creating loops Cannot (yet) observed these scales Estimate: < 30 km

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