1. 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?

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

3. 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

4. T14: EUVFUV001
Hemispherical Variation
Altitudinal Variation

5. T14:EUVFUV001

6. T14: EUVFUV001
Dayside
Nightside

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

8. Nitrogen Emission Comparison
Dayside N
0.098 ± kR
Nightside N
0.048 ± kR
Dayside LBH
0.093 ± kR
Nightside LBH
0.032 ± kR

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

10. Titan FUV Spectral Decomposition
Synthetic Solar
Atomic Nitrogen
Nitrogen LBH

11. 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

12. Synthetic Model Spectrum
Data
Model

13. 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

14. Dayside atomic Nitrogen: 0.033 ± 0.015 kR
Nightside Atomic Nitrogen: ± kR
Dayside Nitrogen LBH: ± kR
Nightside Nitrogen LBH: ± kR

15. 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?

16. T14: EUVFUV001 Altitudinal Distribution
Day
Night

17. Fine Resolution Binning

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

19. T31:EUVFUV001 N C
LBH
Dayside
Nightside

20. Peak Emission Altitudes

21. Peak Emission Altitude Offsets

22. 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