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Bill Lotko, Dartmouth College

Does geospace exercise self control?. Bill Lotko, Dartmouth College. MFLFM Study Group Oliver Brambles, Peter Damiano, John Lyon, Binzheng Zhang 1 Mike Wiltberger 2 Katie Garcia, Slava Merkin 3. 1 2 3. ?. Systems Thinking.

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Bill Lotko, Dartmouth College

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  1. Does geospace exercise self control? Bill Lotko, Dartmouth College MFLFM Study Group Oliver Brambles, Peter Damiano, John Lyon, Binzheng Zhang 1 Mike Wiltberger 2 Katie Garcia, Slava Merkin 3 12 3

  2. ? Systems Thinking The whole is greater than the sum of the parts. – Aristotle … a framework based on the belief that the componentparts of a system can best be understood in the context of relationships with each other and with other systems, rather than in isolation. – Wikipedia A system is what a system is doing. And we had better not say what a system is. – Tom Mandel

  3. Systems Thinking The overall name of these interrelated structures is system. The motorcycle is a system … a system of concepts worked out in steel. There's no part in it, no shape in it that is not in someone's mind. I've noticed that people who have never worked with steel have trouble seeing this – that the motorcycle is primarily a mental phenomenon. – Robert Pirsig Zen and the Art of Motorcycle Maintenance

  4. Systems Thinking The overall name of these interrelated structures is system. The motorcycle is a system … a system of concepts worked out in steel. There's no part in it, no shape in it that is not in someone's mind. I've noticed that people who have never worked with steel have trouble seeing this – that the motorcycle is primarily a mental phenomenon. – Robert Pirsig Zen and the Art of Motorcycle Maintenance

  5. Systems Thinking The overall name of these interrelated structures is system. The magnetosphere is a system … a system of concepts worked out in plasma. There's no part in it, no shape in it that is not in someone's mind. I've noticed that people who have never worked with plasmas have trouble seeing this – that the magnetosphere is primarily a mental phenomenon. – Motorcycle-Magnetosphere Equivalency Zen and the Art of Magnetosphere Maintenance

  6. Systems Thinking • holistic → integration, synthesis • framework→relational • doing → behavioral • mental→ conceptual

  7. MA,  > 1 (MHD) ~ jB dominant Geospace System Coupled SW, Magnetosphere, Ionosphere, Thermosphere  Limits • MA,  >> 1 (HD) • –P dominant

  8. LLBL LLBL → MAGNETOSHEATH MAGNETOSPHERE MAGNETOSHEATH IONOSPHERE MAGNETOPAUSE

  9. 1945 UT 30º Lat 20 Nov 2003 Foster et al. 2005

  10. 12 O+ ions/m2-s 18 06 1012 55 1011 1010 109 O+ Outflow Flux (15 eV – 33 keV) Southern Summer 1997-98 24 Polar / 7600 km Lennartsson et al. 2004

  11. ambipolar field centrifugal force collisional drag gravity mirror force Outflow Mechanics guiding center equations (ponderomotive)

  12. Causal Relations 1 2 3 Strangeway et al. 2005

  13. Empirical Model for Ionospheric Outflow FAST data near 4000-km altitude in the low-altitude cusp Strangeway et al. 05; Zheng et al. 05

  14. Storm-Driven Outflow Storm Simulation MA 7,   1

  15. North South 1013 #/m2-s 2 1 0 1.06  1026 #/s Fluence 6.41  1025 #/s equatorial plane, SM coordinates 15:50 UT, 31 Aug 2005 O+ Outflow Number Flux

  16. DC Poynting Flux AC Poynting Flux S||dc S||ac mW/m2 mW/m2 12 12 8.6 0.8 6.5 0.6 4.3 18 06 O+ Up Flux 0.4 18 06 ions/m2-s 2.2 0.2 0 Astrid-2 / 1000 km Olsson et al. 04 Polar / 4-6 RE Keiling et al. 03 0 24 24 12 1012 Polar / 7600 km Lennartsson et al. 04 1011 18 06 1010 109 24 EM Power In O+ Flux Out

  17. LLBL LLBL → MAGNETOSHEATH MAGNETOSPHERE MAGNETOSHEATH IONOSPHERE MAGNETOPAUSE

  18. Storm-Driven Outflow No outflow O+ outflow Log N Log N XZ plane, GSE coordinates

  19. Convection No outflow O+ outflow equatorial plane, SM coordinates

  20. Fractional O+ Pressure PO/PT 15:50 UT, 31 Aug 2005 1 .8 .6 .4 .2 0 6.6 RE XY plane SM coordinates

  21. Ring Current No outflow O+ outflow equatorial plane, SM coordinates

  22. LLBL LLBL → MAGNETOSHEATH MAGNETOSPHERE MAGNETOSHEATH IONOSPHERE MAGNETOPAUSE

  23. Vorticity (||/B) No outflow O+ outflow equatorial plane, SM coordinates

  24. Sample Line How do J and JB in the magnetosheath change when outflow is added?

  25. LARGER LARGER Magnetosheath J, JB decrease with outflow • flow diversion away from stagnation region is diminished • more magnetic flux is reconnected • reconn. potential, • CPCP are larger

  26. LLBL LLBL → MAGNETOSHEATH MAGNETOSPHERE MAGNETOSHEATH IONOSPHERE MAGNETOPAUSE

  27. JE No outflow O+ outflow equatorial plane, SM coordinates

  28. Dayside Reconnection Line LFM simulation V = 400 km/s n = 5 cm-3 Cs= 40 km/s Bz= -5 nT Σp= 5 mhos Color-coded density with streamlines Streamlines in Z = 0.2 RE plane at ±Y = 10, 5.2, 4.6, 4, 3.7, 2.9, and 2.5 RE Lopez et al. 2009

  29. Comparison of rec with PC Lopez et al. 2009 V = 400 km/s, n = 5 cm-3, Cs= 40 km/s, Σp= 5 mhos

  30. LLBL LLBL → MAGNETOSHEATH MAGNETOSPHERE MAGNETOSHEATH IONOSPHERE MAGNETOPAUSE

  31. MI Interaction With O+ Outflow • CPCP  • Hemispheric FAC  • Dayside mean conductance  • Precipitating electron power  • Ionospheric Joule diss. 

  32. Key Points • Geospace exercises (some) self control • Thermosphere-ionosphere actively responds to magnetosphere • Ionospheric outflows modify • magnetotail state • upstream state • inner magnetosphere • Understanding this behavior requires system thinking

  33. Geospace System Focus Group? Icebreaker 10:30-12:00 AM today, Erickson Room • “Penetration” electric fields John Foster • Magnetospheric-ionospheric plasma circulation Frank Toffoletto • Reconnection and transpolar potentials Slava Merkin • Global oscillation, periodicity, sawtooth phenomena Joe Borovsky

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