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Titan Airglow: FUV & EUV 2009 UVIS Spectra of Airglow During Day, Night & Eclipse :
JOSEPH AJELLO JPL MICHAEL STEVENS NRL ROBERT WEST JACQUES GUSTIN LPAP GREG HOLSCLAW CU TODD BRADLEY UCF agu: dEC 2011
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TITAN PROTON PLASMA (0.1 keV-4 MeV) & SOLAR XUV GENERATES 2-level IONOSPHERE (300-1500 KM)
Solar XUV Excitation –Strong Top Ionosphere -Magnetospheric: p and O+ Plasma (Cravens et al., 2008).
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N2 Cross section Analysis for Dayglow VI (2)→UVIS (16)→Lab(e +N2 300 features)
V(z)=g(z) x w gj (z) = F (e) x n(z) x s(e) Dl=0.2Å Dl=30Å Dl=5Å DD
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ISS & UVIS OBSERVATION OF TITAN SOLAR ECLIPSE @ 600K km
plasma + N2
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FUV DARK SIDE LIMB & DISK SPECTRA DOY110-2009 @15K km
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Laboratory Result: p + N2
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ELECTRON CROSS SECTIONS FOR TITAN DAYGLOW UV EMISSION MODEL
Stevens et al., 2011 “Production of Titan’s Far ions Ultraviolet Nitrogen Airglow” AURIC Code Emission Cross Sections: N2 Carroll-Yoshino c4′—X system,b‘-X, b-X systems N I and N II multiplets the N2 Lyman-Birge-Hopfield a—X system (Young et al., 2010) the N2 Vegard-Kaplan A—X bands sLBHPK= 0.6 A&S (1985) sLBH=0.7 A&S (1985)
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Pixel Center Ray Height (km)
Best (S/N) Titan Dayglow UVIS Limb Spectrum; 22June 2009: ‘800 km STARE’ –40 One hour EUV and FUV image of 15 – 4 minute records . –42 EUV –44 DEC (deg) –46 –48 4 2 –2 –4 RA (deg) 1500 1000 FUV Pixel Center Ray Height (km) 500 10 20 30 40 50 60 Pixel Number
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AURIC MODEL FIT TO UVIS EUV SPECTRUM AT 1000 KM
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AURIC MODEL FIT TO UVIS FUV SPECTRUM AT 1000 KM
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AURIC MODEL OF FUV VERs AND COLUMN EMISSION RATES
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The FUV Dayglow Limb Spectra of Titan
Surface to Exosphere: 13Dec04.
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DARK SIDE OBSERVATION OF TITAN ON 25MARCH2008
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FUV LIMB PROFILE INTENSITIES OF 25 MARCH2009
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Model fit to UVIS Dark Limb (Twilight) EUV Spectrum from 25Mar08 with a Regression Model - 7-Vectors)
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How to get a BRIGHT UV Airglow in 2009
BRIGHTEST LIMB AIRGLOW 22JUNE obs[14] SZA=53DEG, MRH =1000 km S/C ~60k KM BRIGHTEST DISK & 2ND LIMB 12OCT OBS[45-51] LIMB~ 1000KM SZA~95, S/C ~175k KM
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SUMMARY OF 2009 ECLIPSE, LIMB, BRIGHT DISK AND DARK DISK UVIS OBSERVATIONS OF TITAN
Solar Driven processes on Dayside and Twilight Observed EUV and FUV Emissions during 1 of 3 Eclipses. Probably Plasma impact. Tentative Sporadic FUV Nightglow Spectra at 0.1 Intensity level of dayglow. Probably Plasma Impact (protons, O+, electrons). Twilight (Terminator) Glow-Solar XUV at deg Limb SZA ~ Dayside Intensity. N2 EUV (12R) /FUV (200R) dayglow structure similar to Earth
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Elvis Lives (Titan Organic Chemistry-Biomarker
Elvis Lives (Titan Organic Chemistry-Biomarker! ) 45 years with my Honey
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