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Multi-spacecraft analysis of the geomagnetic tail: The source of intense and explosive aurora

8 March, 2013 GCOE conference. Multi-spacecraft analysis of the geomagnetic tail: The source of intense and explosive aurora. Miho Saito Solar-terrestrial environmental laboratory, Nagoya University. CREDIT:NASA/STEREO. Geomagnetic tail. Aurora from space At the initiation of substorm.

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Multi-spacecraft analysis of the geomagnetic tail: The source of intense and explosive aurora

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  1. 8 March, 2013 GCOE conference Multi-spacecraft analysis of the geomagnetic tail: The source of intense and explosive aurora Miho Saito Solar-terrestrial environmental laboratory, Nagoya University CREDIT:NASA/STEREO

  2. Geomagnetic tail

  3. Aurora from space At the initiation of substorm To Sun

  4. Is a substorm a manifestation of energy storage and release in the tail ?: 1. Aurora Model of auroral development [Akasofu, 1964] From auroral observations, the answer is not obvious. Saito, M. , 11th ICS, Sep 2012

  5. Is a substorm a manifestation of energy storage and release in the tail ?: 2. Magnetic energy YES. When we know HOW the energy is loaded, we may know how it is released, Yan Song ICS11

  6. In-situ observation of tail and drawback of single spacecraft measurements [Saito et al., 2010 JGR]

  7. Five-spacecraft view of tail THEMIS orbits during 6-7 UT To Sun

  8. Thinning at 11 Re in the pre-midnight (THEMIS) ~20min Magnetic field (SM)

  9. Textbook view of energy storage in the tail [McPherron et al., 1973; McPherron, Introduction to Space Physics] This processresults in compression of plasma.

  10. Thinning (~20 min) Five spacecraft obtain both spatial structure and its temporal changes. dPT~0 dn~0, dP<0 PT=Pi+Pe+Pb PT=Pi+Pe+Pb Pi The defect of in-situ measurements removed! Ni

  11. Multi-spacecraft obs. show new types of energy storage process in the geomagnetic tail New Finding Incompressible change

  12. Conclusions • Multi-spacecraft obs. improved in-situ diagnosis of the geomagnetic tail • The findings are also useful for forecasting the space weather • We showed, for the first time, the incompressible nature before the intense and explosive aurora Energy flow Aurora Solar Wind Tail

  13. Compressibility matters Is it also the case for space? (Future study) A paint-cans-and-rifle experiment in “For the love of physics” by Walter Lewin paint can rifle liquid + air -> can deformed liquid filled -> explosion Result of the shock

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