1. Variability in Titan’s Nitrogen Emissions (plus a little about the ~1600Å mystery feature)

2. From January Team Meeting
Nitrogen Day/Night results
Dayside atomic Nitrogen: ± kR
Nightside Atomic Nitrogen: ± kR
Dayside Nitrogen LBH: ± kR
Nightside Nitrogen LBH: ± kR
Little to no day to nightside correlation (R2 < 0.3)

3. Total Titan Spectrum from T-14

5. Full spatial/spectral res.
Data Set Selection
Full Disk Observation
Day + Nightside
Full spatial/spectral res.
T-05: 2005_04_16_11_23_11
T-09: 2005_12_26_21_45_00
T-10: 2006_01_15_14_47_37
T-11: 2006_02_27_13_30_58
T-13: 2006_05_01_02_23_53
T-14: 2006_05_01_02_23_53
T-15: 2006_07_02_11_57_46
T-17: 2006_09_07_12_52_22
T-18: 2006_09_23_11_34_29
T-21: 2006_12_12_04_17_34
T-24: 2007_01_28_22_35_38
T-27: 2007_03_26_03_30_00
T-31: 2007_05_28_10_01_42
T-34: 2007_07_18_16_28_23

6. 1.2 ± 0.3e-3
6.3 ± 1.7e-4
1.3 ± 0.5e-3
5.2 ± 1.2e-4
TIMED-SEE total variability

7. Jacques stellar data and compositional fits
C2H2
C2H4
C4H2
Tholin

9. Day vs. Nightside Disk Spectra
T-27 Example Fit
Day vs. Nightside Disk Spectra
Dayside
Nightside

10. T-27 Input Spectra
TIMED-SEE
Atomic N
Molecular N2
H Lyman-alpha
CH4 Absorption

11. T-27 Example Dayside disk model fit.
0.012 kR Atomic N
0.025 kR Molecular N
0.314 kR Lyman-alpha
1.510 kR Reflected Solar

12. Total Disk Rayleighs
0.99±.39 kR
0.12±.03 kR
Dayside/Nightside Correlation: R2=0.42
Dayside/Sun Correlation: R2=0.11
Nightside/Sun Correlation: R2 = 0.001

13. Atomic N Brightness
Dayside/Nightside Correlation: R2=0.03
Dayside/Sun Correlation: R2=0.04
Nightside/Sun Correlation: R2 = 0.005

14. Molecular LBH
Dayside/Nightside Correlation: R2=0.01
Dayside/Sun Correlation: R2=0.03
Nightside/Sun Correlation: R2 = 0.002

15. Conclusions
Wide dayside disk brightness correlated with Solar spectrum.
Variation in Nightside brightness uncorrelated with incident Solar spectrum.
Total atomic and molecular nitrogen emissions uncorrelated with solar input or orbital position of Titan.
Emission due to precipitating magnetospheric electrons as important as photoelectrons.

16. REALLY STRONG ~1600A FEATURE; T27
~1600Å line present in solar spectrum, but unmodeled by Titan hydrocarbons.

17. WEAK/NON 1600A FEATURE
Non-existent ~1600Å feature in either Solar or Titan Disk Spectrum