Determining Auroral Oval Boundaries Based on Global FUV ... · FUV spectra observed by TIMED/GUVI H...
Transcript of Determining Auroral Oval Boundaries Based on Global FUV ... · FUV spectra observed by TIMED/GUVI H...
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Determining Auroral Oval Boundaries Based on Global FUV Images and Aurora Model
Yongliang Zhang1, Larry J. Paxton1, and Dieter Bilitza2
1Johns Hopkins University Applied Physics Laboratory
2NASA & George Mason University
December 2, 2012, CEDAR-GEM Mini Workshop
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Definition and types of auroral boundaries
• Definition: – Boundaries at a fixed electron energy flux (0.2 ergs/s/cm2)
• Types: – Global (swath) equatorward boundaries – Global (swath) poleward boundaries
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An example of boundaries
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Validation
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Outputs of GUVI auroral model
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FUV spectra observed by TIMED/GUVI H 1216Å
O 1304Å
O 1356Å
N2 LBHS
N2 LBHL
How was the GUVI auroral model developed?
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Global FUV auroral images and products: TIMED/GUVI
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Auroral NmE and HmE too
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FUV based auroral model (Kp dependent)
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Kp dependence of electron mean energy
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Epstein Function fits the data well.
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How do we know that the behavior of the model matches reality?
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2)( eeeuveee NPPVNtN
α−+=•∇+∂∂
Plasma continuity equation
eeuve PPN +=2αIn ionosphere E-region (local equilibrium)
euveuve PN =2)(α e
ee PN =2)(α
Assumption
22 )()( ee
euvee NNN +=
Assimilation Equation
Assimilating modeled and/or measured NmE in IRI
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Assimilation of model NmE in IRI (Quiet time Kp =0.7)
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Assimilation of model NmE in IRI (Moderate Active time Kp =4.0)
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Assimilation of measured SSUSI NmE in IRI (Kp =4.3 (April 1, 2007, 8:59UT)
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SSUSI data in southern hemisphere
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SSUSI data (next orbit, southern hemisphere)
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Summary • GUVI aurora (Kp dependent) model based equatorward boundary has been
included in IRI 2012.
• Near real-time SSUSI boundaries are being added in IRI.
• A solar wind driven auroral model is nearly completed.
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Thanks!