Titan Nitrogen Emissions

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Presentation transcript:

Titan Nitrogen Emissions Where are Nitrogen NI,II and LBH emissions coming from on Titan? Is there a hemispherical or altitudinal trend in the emissions? How strong are nitrogen emissions from the ‘dark’ side of Titan?

T14: EUVFUV001 Atomic + Molecular Nitrogen Atomic Carbon Hydrogen Lyman-alpha Solar Reflection 1598 Å Feature

Dayside Nightside Combination. TA: EUVFUV001 TB: EUVFUV002 T3: MIDIRTMAP003 T3: MIDIRTMAP002 T4: FIRNADCMP002 T6: FIRNADCMP003 T10: MIDIRTMAP010 T26: EUVFUV002 T28: FIRNADCMP002 T29: FIRNADCMP002 T31: FIRNADMAP004 T31: FIRNADCMP002 T32: EUVFUV001 Nightside TB: EUVFUV001 T3: EUVFUV001 T3: NIGHTWAC003 T4: EUVFUV001 T4: FIRNADCMP003 T6: FIRNADMAP002 T8: MIDIRTMAP005 T9: EUVFUV001 T10: NIGHTNAC001 T10: EUVFUV001 T12: AURORA002 T17: FIRNADCMP003 T27: EUVFUV001 T27: MIRLMBINT001 T28: CLOUDMAP002 T28: FIRNADCMP001 T30: CLOUDMAP001 T30: EUVFUV001 T31: FIRNADCMP001 T31: PHOTOWAC001 T31: EUVFUV001 T35: EUVFUV001 Combination. T5: FIRNADCMP002 T5: EUVFUV001 T6: MIDIRTMAP007 T11: EUVFUV002 T13: EUVFUV002 T14: EUVFUV001 T14: EUVFUV002 T17: EUVFUV001 T18: EUVFUV001 T20: CLOUDMAP201 T20: CLOUDMAP001 T21: EUVFUV001 T24: EUVFUV001 T27: EUVFUV002 T29: FIRNADCMP001 T34: EUVFUV001

T14: EUVFUV001 Hemispherical Variation Altitudinal Variation

T14:EUVFUV001

T14: EUVFUV001 Dayside Nightside

Dayside vs. Nightside Intensities Sum over atomic and nitrogen bands on day and nightside to compare intensities of emission through various Titan encounters.

Nitrogen Emission Comparison Dayside N 0.098 ± 0.032 kR Nightside N 0.048 ± 0.019 kR Dayside LBH 0.093 ± 0.033 kR Nightside LBH 0.032 ± 0.013 kR

Dayside kR/bandpass Nightside kR/bandpass Atomic N Nitrogen LBH Carbon

Titan FUV Spectral Decomposition Synthetic Solar Atomic Nitrogen Nitrogen LBH

T14:EUVFUV001 Dayside Decomposition Dayside Spectrum Fitted Solar Spectrum 1.83 kR Fitted Lyman-Alpha 0.095 kR Fitted Atomic Nitrogen 0.014 kR Fitted Nitrogen LBH 0.031 kR

Synthetic Model Spectrum Data Model

Fitted Atomic Nitrogen T14:EUVFUV001 Nightside Decomposition Nightside Spectrum Fitted Lyman-Alpha 0.18 kR Fitted Atomic Nitrogen 0.024 kR Fitted Nitrogen LBH 0.014 kR

Dayside atomic Nitrogen: 0.033 ± 0.015 kR Nightside Atomic Nitrogen: 0.027 ± 0.008 kR Dayside Nitrogen LBH: 0.017 ± 0.024 kR Nightside Nitrogen LBH: 0.012 ± 0.007 kR

Correlations Little correlation between dayside and nightside emissions (R2 < 0.3) No apparent correlation to Titan’s position within the Saturn system. No apparent correlation to solar activity (SEE data)* What is controlling the activity of the nitrogen emissions?

T14: EUVFUV001 Altitudinal Distribution Day Night

Fine Resolution Binning

T14:EUVFUV001 LBH C N Dayside N: 1020 km Nightside N: 950 km Dayside LBH: 970 km Nightside LBH: 940 km Dayside Nightside

T31:EUVFUV001 N C LBH Dayside Nightside

Peak Emission Altitudes

Peak Emission Altitude Offsets

Summary of Altitudinal Variation The altitude of peak nitrogen emission on the day and nightside of Titan is correlated. Atomic nitrogen generally peaks at a higher altitude than molecular nitrogen. Dayside Atomic N: 1058 ± 30 km Nightside Atomic N: 1031 ± 28 km Dayside LBH: 1000 ± 21 km Nightside LBH: 971 ± 40 km