Alain, Michelle - here's the HST CAR for 20jan01. It's based on all the phone calls I made from
Toulouse etc. I think I have been generous with the times allocated for slews, and if you think time
can be recovered from slews and used for observing then let's talk about it. After lunch I will
confirm with CIRS, ISS, VIMS that this version satisfies their needs. - Ian
CAR - HST 20jan01
Written 02aug00
OBSERVATION NAME:
UVIS_C23JU_HSTAUR003
SUBMITTED BY:
UVIS / Ian Stewart, Wayne Pryor
MEASUREMENT OBJECTIVE:
To observe the Jovian aurora in concert with HST, using UVIS, CIRS, ISS, and VIMS.
SCIENTIFIC OBJECTIVE
These observations are part of a coordinated Cassini/HST campaign to understand the connections
between the solar wind and the Jovian aurora. HST will observe in the visible from the Earth, at a
phase angle <12 deg. Cassini will observe in wavelengthregions from the EUV to the far IR, from a
range of c. 182 Rj, and from a phase angle of c. 103 deg. Both platforms will see the sunlit morning
hemisphere; HST will also see the sunlit afternoon hemisphere; and Cassini adds the dark morning
hemisphere and the midnight sector. UVIS and VIMS will see both north and south auroral zones
simultaneously, while CIRS, ISS, and HST will alternate north and south. Cassini and HST
together will see conjugate sections of the two auroral zones.
UVIS, within the general objective of understanding the relationship between solar wind conditions
and the Jovian aurora, has two major goals:
1) To acquire high-resolution FUV and EUV spectra of the Jovian N and S aurora and the tropical
airglow; and to study the relationship between auroral brightness and morphology and its
spectral content.
2) To acquire broad-band spectra at high time resolution (a few seconds); and to study the
relationship between short-term brightness variations and other auroral and solar wind
characteristics.
ACTIVITY DESCRIPTION
The observations are modelled on the CIRS feature-track mode: a section of the auroral zone is
tracked for 5 hours as it moves from one limb to the other. The observations last 20 hours, in 4
sections of 5 hours each. In each section 9 targets are identified and observed in a pattern that
allows UVIS and CIRS to track segments of both zones as Jupiter rotates, ISS to periodically
image the aurora and lightning on the dark side, and CIRS to periodically view dark space for
calibration purposes. VIMS observes the entire disk throughout. The basic cycle time is 300 mins.
ACTIVITY START TIME
01020T06:00 approx.
ACTIVITY DURATION
300 mins
NUMBER OF ITERATIONS
4
INTERVAL BETWEEN ITERATIONS
zero (i.e., no dead time - each iteration is followed immediately by the next)
TARGET
Jupiter
POINTING
Module used:
Slit orientation:
GENMOS_AB
UVIS slits perpendicular to Jovian equator.
Pointing information is given in mrad offsets from the center of Jupiter.
The North and East offsets for the 8 auroral targets are as follows:
Position
N_1
N_2
N_3
S_1
S_2
S_3
I_N
I_S
C_N
C_S
North East
2.8
0.9
2.8
0.0
2.8
-0.9
-2.8
0.9
-2.8
0.0
-2.8
-0.9
2.8 v -4.0
-2.8 v -4.0
21.0
0.0
-21.0
0.0
Note that I_N ans I_S constitute a 1x2 ISS mosaic.
These pointings are achieved according to the following timetable:
time target durn
(mins)
(mins)
00
00
03
13
16
48
begin activity
3 slew to C_N
C_N 10 CIRS observes dark space
3 slew to N_1
N_1 32 UVIS/CIRS/VIMS observe the aurora
1 slew to I_N
49
60
61
93
94
105
106
138
139
150
300
I_N
11 execute 1x2 ISS mosaic (aurora & lightning)
1 slew to N_2
N_2 32 UVIS/CIRS/VIMS observe the aurora
1 slew to I_N
I_N 11 execute 1x2 ISS mosaic (aurora & lightning)
1 slew to N_3
N_3 32 UVIS/CIRS/VIMS observe the aurora
1 slew to I_N
I_N 11 execute 1x2 ISS mosaic (aurora & lightning)
repeat the above
end of activity
Repeat 4 times: total time 20 hours:
first 5 hours: as above
second 5 hours: as above but replace North with South
third 5 hours: same as first 5
fourth 5 hours: same as second 5
Slew margins:
estimated slew times per 150 mins = 9 mins
allocated slew times per 150 mins = 11 mins
margin per 150 mins
= 2 mins
ESTIMATED DATA VOLUMES
UVIS: 1.18 kbps continuous for 20 hours
= 85 Mb
CIRS: 4.0 kbps continuous for 20 hours
= 288 Mb
ISS :
allocation = 1242 Mb
VIMS: 4 repeats of 6 sets of 3 exposures = 4x6x2x(4.6Mb) = 331 Mb
Total = 1946 Mb
NOTES
This CAR version is consistent with the pointing profile submitted by UVIS to C23 Port #2. All
teams involved are invited to comment to me (IS) at: 303-492-4630,
Ian.stewart@lasp.colorado.edu.
In particular, please give me a brief outline of your team's scientific goals.