1. HDAC: 2004

2. HDAC Status 2004: ~450 data sets in Jun. 2004
~2700 data sets in Jan. 2005
HDAC run in photometer mode most of the time, slow sensitivity decrese,
9 modulation measurements, switching filaments
Important observations in 2004:
LISM modulation, switching filaments
Phoebe, Titan, Saturn, …
“Systemscans”

3. HDAC Status: Radiometry
Small sensitivity changes over the whole year 2003/4
Hot Model fits data
Sensitivity is about 50 c/s/R

4. HDAC Status: Radiometry Analysed data from IPHSURVEY sequences
Looking for data, which are constant within a sequence

5. HDAC absolute sensitivity:
HDAC sensitivity 2002 (no break-ins)

6. HDAC absolute sensitivity:
absolute sensitivity stabilized ... ~ 60 counts/sec/R

7. HDAC Status: Radiometry Analysed data from IPHSURVEY sequences
Data, which are constant within the sequence
Analysed the variance / mean value – relation
n … number of incoming photons
m … measured value
µ … “Sensitivity”

8. HDAC Status:
Radiometry
Analysed the variance / mean value – relation

9. HDAC Status:
Radiometry
Analysed the variance / mean value – relation

10. HDAC Status 2003:

11. HDAC Status 2004:

12. HDAC Status 2004:

13. HDAC Status:
Radiometry
HDAC Sensitivity from FUV data (IPHSURVEY)

14. HDAC Status: Radiometry (see: HK_EVAL_NEW.PRO)
Analysed the variance / mean value – relation
Decrease of variance / mean value of 75% every year
Overall HotModel factor
2003 – 63
2004 – 53
Additional model inputs from sun exitation changes
Open problems:
Absolute sensitivity change in comparison to FUV
(FUV, absolute spectral response)

15. Modulation mode:
H and D-Cell Modulation lower than expected
Shape of the modulation curve is different
Derived a new Power-Tau-relation from all existing measurements
Results:
Describes all measurements
Stable situation for the last 3 years
Possible reasons:
Loss of Hydrogen and/or change of dissociation rate
Filament or wall dependent

16. HDAC modulation analysis:
Results:
no differences using the filaments 2 instead of filaments 1
The additional signal by switching on the D cell is still there
Decided to switch back to filaments 1

17. T01:54:56.0
T01:51:32.0

18. HDAC modulation analysis:
7 * HDAC conditioning in 2004
T02:51:
T19:00:
T11:24:
T18:47:
T17:46:
T12:22:
T08:25:

19. HDAC modulation: New program for HDAC modulation analysis
Integrates HotModel & Spice

20. HDAC modulation: New program for HDAC modulation analysis
Integrates HotModel & Spice
Next steps:
Optimizing parameters
Accuracy estimation
sEstm = A
sLISM = A
Diff  1 mA
( A, A)

21. HDAC modulation analysis:
Modulation analysis only works for H-modulation
Problem: Influence of the D-Cell
(radiation of D-filament)
Between 20% & 30%

22. HDAC modulation analysis:
Modulation analysis only works for H-modulation
Problem: Influence of the D-Cell
(radiation of D-filament)
Between 20% & 30%
Sometimes there is no additional Signal
Result: See Result.xls

23. Mod.-Messung
Datumstring
Zunahme Verhältnis
Doppler Vel 3
T06:55: 0,
-2, 4
T21:50: 0,
-10,749073 5
T22:04: 0, 2, 6
T13:04: 0,
11,217736 7
T06:35: 0,
-3, 8
T07:51: 0,
-5, 9
T14:21: 0,
2,839637 10
T18:01: 0, 0, 11
T01:51: 0, 1, 12
T21:51: 0, 9, 13
T01:51: 0, 9, 14
T01:51: 0,
10,512993 15
T05:51: 0,
15,679651 16
T10:12: 0,
9,222591 17
T11:55: 0,
-7, 18
T14:51: 0,
16,913488 19
T11:51: 0, 2, 20
T09:51: 0,
-1, 21
T13:10: 0, 1, 22
T18:21: 0,
-15,738391 23
T02:51: 0,
-20,647935 24
T19:00: 0,
-0, 25
T11:24: 0,
-0, 26
T18:47: 0,
-0, 27
T17:46: 0,
-11,140243 28
T12:22: 0, 1, 29
T08:25: 0,
-25,24598

24. HDAC modulation: Korrekturversuch [1d2, 2d2, 5d2, 5d2,

25. HDAC modulation: Korrekturversuch [1d2, 2d2, 5d2, 5d2,

26. HDAC modulation: Temperaturrekonstruktion Funktioniert oft nicht!
[1d2, 2d2, 5d2, 5d2,
9d2, 22d2, 26d2, 33d2]

27. HDAC modulation analysis:
HDAC modulation measurements during the other Titan observations until end of mission
Need to compare the HDAC data with FUV data (HDAC's red tail sensitivity)

28. Titan:
T18
Problem:
New tour kernel
Old pointing

29. Titan:
T15
T11
T10
T07
T06
T08

31. Titan Modulation Data T
T08

32. Titan
Limb Measurements

33. Titan
Off-Axis Response

34. Titan
Limb Scan

35. Titan
Limb Scan
Ergebnis

36. Data Analysis:
Phoebe

37. Data Analysis:
Phoebe

38. Data Analysis:
Phoebe
FUV-Data
HDAC spectral sensitivity

39. HDAC Events: TITAN Dist = 110.000 km Phase Angle = 1° MV  26 kc
MV  450 R (?)

40. HDAC Events: SATURN Dist = 324.937 km Phase Angle =9.3° MW  50 kc
MW  900 R (?)

41. HDAC Events:
SATURN
System Scan

42. HDAC Open Problems for 2005:
Absolute sensitivity and comparison to FUV
FUV Data handling (more or less solved)
Applying sensitivity from Bill
Long time investigation of HDAC - Sensitivity
Saturn – Orbit System Scan
Saturn – Limb(?) san
Find out Orbit-situation
Titan Limb-Scan
Titan Modulation

43. HDAC Open Problems for 2005:
SATURN
Absolute sensitivity and comparison to FUV
FUV Data handling (more or less solved)
Applying sensitivity from Bill
Long time investigation of HDAC - Sensitivity
Saturn – Orbit System Scan
Find out Orbit-situation
Titan Limb-Scan
Titan Modulation