Titan: FUV & EUV Spectra Limb, Dayglow, Nightglow & Eclipse

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Presentation transcript:

Titan: FUV & EUV 2007-2009 Spectra Limb, Dayglow, Nightglow & Eclipse JOSEPH AJELLO JPL MICHAEL STEVENS NRL ROBERT WEST JACQUES GUSTIN LPAP GREG HOLSCLAW CU TODD BRADLEY UCF team meeting: January 2011

Titan dayglow LIMB MODEL DPS presentation & Accepted Paper TO JGR “Production of Titan’s Far Ultraviolet Nitrogen Airglow” of 22june2009 ‘LIMB STARE’ Observation REVISE TITAN AURIC forward SOLAR DRIVEN Model : N2 Density scaled to de la haye 950km (2007), shape( fulchignoni et al (2005) Solar XUV Irradiance (see-LEAN ET AL., 2010) [FLUX 6<vi] CH4 (Shemansky et al., 2005) N2 Carroll-Yoshino c4′—X system (Stevens, 2001 v’=0;Ajello et al., 1989;1989;2010),b-X(James et al., 1990)b’-X(Ajello, 2010) 16 (EUV) 6(FUV)N I and N II multiplets (Samson et al., 1991) the N2 Lyman-Birge-Hopfield a—X system [Young et al., 2010] N2 Vegard-Kaplan A-X bands (PIPER,1993;SHEMANSKY,1969) OVERPLOT 2007-2009 ECLIPSE,DARK SIDE, DAYSIDE & LIMB SPECTRA

DAYGLOW LAYER OF 22JUNE 2009

One hour EUV and FUV image of 15 records of 22June2009 observation

AURIC MODEL FIT TO UVIS SPECTRUM AT 1000 KM

AURIC MODEL OF EUV VERs AND COLUMN EMISSION RATES

AURIC MODEL OF FUV VERs AND COLUMN EMISSION RATES

The FUV Airglow of Titan Titan FUV UVIS Airglow Limb Spectra from the Surface to Exosphere on 13Dec04.

DARK SIDE OBSERVATION OF TITAN ON 25MARCH2008

Energy Input to Titan: Solar XUV, Magnetosphere Plamsa ion, Electron Precipitation (Sittler et al., 2009; Hartle et al., 2006 estimates 1015ergs/s keV O+-ions) -Solar UV causes day-side ionosphere out to SZA 100deg -nightside ionosphere formed by plasma transport , variable SW pressure –titan can be inside/outisde magnetosphere

7AUGUST2009 ECLIPSE OBSERVATION

ISS IMAGE OF TITAN DURING ECLIPSE

Laboratory Spectrum of e + N2

PIXEL24:39

SUMMARY OF 2007-2009 ECLIPSE, LIMB, BRIGHT DISK AND DARK DISK UVIS OBSERVATIONS OF TITAN Solar Driven processes on Dayside N2 EUV (12R) /FUV (200R) Airglow structure similar to Earth for 22June2009 limb observation Dark Side-Solar Scattering to 120 deg SZA (function of angle between co-rotation and Sun-Titan direction RAM Dark Side Intensities = 0.5 Dayside on 25march2008 is T? Observed an eclipse of 7august2009 - No FUV molecular emissions (VK or LBH) - c4’(0,1), c4’(2,3; 3,4) EUV emissions -NII 1085A, NI1200 A emissions -UV eclipse spectra are weak compared to non-eclipse observations (25march08; 22june2009; 8may 2008)