1 / 22

Pre-flare Energy Storage

Pre-flare Energy Storage. Dana Longcope Montana State University. Current sheets (YES) Reconnection (NO then YES). Thanks: Dave McKenzie Jonathan Cirtain Jason Scott. Work supported by NASA NAG5-10489. The Photospheric Field. 2001-08-10 12:51 UT. 2001-08-11 17:39 UT.

nola
Download Presentation

Pre-flare Energy Storage

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pre-flare Energy Storage Dana Longcope Montana State University Current sheets (YES) Reconnection (NO then YES) Thanks: Dave McKenzie Jonathan Cirtain Jason Scott Work supported by NASA NAG5-10489 RHESSI/SOHO/TRACE

  2. The Photospheric Field 2001-08-10 12:51 UT 2001-08-11 17:39 UT • distribution of isolated • sources • evolution over ~ days • anchors coronal field RHESSI/SOHO/TRACE

  3. The Coronal Field coronal connections P10 P07 N05 y49 N09 y71 P04 y41 N01 Total flux connecting Pi Nj: yij RHESSI/SOHO/TRACE

  4. The Coronal Field sources sources Potential Field: RHESSI/SOHO/TRACE

  5. Quantifying Flux separator null null • All flux connecting P07N01 • enclosed by 2 separatices • Intersect at separator RHESSI/SOHO/TRACE

  6. Quantifying Flux separator close path • All flux connecting P07N01 • enclosed by 2 separatices • Intersect at separator • All P07N01 lines enclosed RHESSI/SOHO/TRACE

  7. Model of energy storage Unconstrained minimum: W Wpot Flux y=y(v) linking poles 0 RHESSI/SOHO/TRACE

  8. Model of energy storage Constrain Flux y & minimize energy… W Wfce DW Wpot Flux Constrained Equilibrium (Longcope 2002) Potential iff Dy=y-y(v) =0 0 RHESSI/SOHO/TRACE

  9. Model of energy storage Flux Constrained Equilibrium (Longcope 2002) Lowest Energy w/ fixed y: • Current-free • except … RHESSI/SOHO/TRACE

  10. Model of energy storage Flux Constrained Equilibrium (Longcope 2002) Lowest Energy w/ fixed y: • Current-free • except … • Current Sheet • @ separator • I(Dy) • Mag. Energy • in excess of • potential • DW(Dy) RHESSI/SOHO/TRACE

  11. Role(s) of Current Sheets W Energy storage: DW accumulates prior to reconn’ burst Wfce DW Wpot Stored globally 0 RHESSI/SOHO/TRACE

  12. Steady Reconnection? Sweet-Parker: = 4 months RHESSI/SOHO/TRACE

  13. Role(s) of Current Sheets W Energy RELEASE: DW accumulates prior to reconn’ burst: latency Wfce DW Wpot Rapidly released via local E field 0 RHESSI/SOHO/TRACE

  14. Role(s) of Current Sheet Site of localized reconnection 2 X 1018 Mx of newly reconnected flux (1% of Dy) RHESSI/SOHO/TRACE

  15. Role(s) of Current Sheet Releases DE ~ I Dy ~ 1031 ergs 2 X 1018 Mx of newly reconnected flux (1% of Dy) RHESSI/SOHO/TRACE

  16. Flux emergence AR9574 begins emerging @ 7:34 2001-08-10 AR9570 remains Coronal response RHESSI/SOHO/TRACE

  17. Evidence of reconn’n latency Stack plot of inter- connecting loops loops RHESSI/SOHO/TRACE

  18. Evidence of reconn’n latency GOES 1-8 A TRACE 171 A loops EUV emergence loop EUV RHESSI/SOHO/TRACE

  19. Evidence of reconn’n latency reconnection latency cooling emergence RHESSI/SOHO/TRACE

  20. Evidence of reconn’n latency latency ~24 hrs flux transfer 3.5 hrs Dy = 1021 Mx dy/dt = 109 V from potential model y(v) latency y from observed loops RHESSI/SOHO/TRACE

  21. Consequence of latency Dy = 1021 Mx I = 1.3 x 1011 Amps DWFCE = 1.4 x 1031 ergs RHESSI/SOHO/TRACE

  22. Consequence of latency GOES 1-8 A GOES 0.5-4 A Radiated power P ~ 5 x 1026 erg/sec Radiated energy1031 ergs DWFCE = 1031 RHESSI/SOHO/TRACE

More Related