PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 1999-03-23 NOTE = " E-mail and other messages concerning MGS Radio Science on or about 1997/022." END_OBJECT = TEXT END From rsimpson Wed Jan 22 13:13:59 1997 Date: Wed, 22 Jan 97 13:13:27 -0800 From: rsimpson (Richard Simpson) To: hinson@nimbus, joe@nova, john@oberon.jpl.nasa.gov, len@nova, rsimpson, trish@zygra.jpl.nasa.gov Subject: Wiggle Tests Status: RO Trish just called to report that the spacecraft will be one-way on the USO during Wiggle Tests today through Friday. Today's test has already started; the spacecraft goes one-way at 21:10 UTC and remains in that state for an hour. I'm not sure how long the wiggling takes. She has the DSP going to idle at 22:15 and will use some extra time after that for a retransmission. I asked her to send e-mail when the retransmission is complete; I'll then pull over the packets. Normal query time means we probably won't be able to do much processing today, but there should be files Joe can work with tomorrow morning. I presume we can expect the same sort of thing for the next two days, though I don't know what the opportunities are for retransmission. ---------------------------------------------------------------------------- From trish@qmail.jpl.nasa.gov Wed Jan 22 15:28:57 1997 Message-Id: Date: 22 Jan 1997 15:24:21 -0800 From: "Trish Priest" Subject: Wiggle Test #6 To: "Dick Simpson" Cc: "John Armstrong" , "Joe Twicken" X-Mailer: Mail*Link SMTP-QM 3.0.2 Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; Name="Message Body" Content-Transfer-Encoding: quoted-printable Status: RO Mail*Link=AE SMTP Wiggle Test #6 Hello, Dick, I finished the retransmission. I retransmitted 21:30:00 to 22:15:00. The TOT query returned all the SFDUs that I expected. Spacecraft is on LGA, 1-way, referenced to USO. DSP is 5000 sps, 12-bit, 2.5kHz filter, mode 2. Below are some interesting times. (all on DOY 022 in UTC ERT) 21:05:00 DSP run 21:35:00 Trish made a configuration mistake, and the good data starts here. 21:45:30 (approx) Solar array moved to wiggle position 21:46:00 (approx) Wiggle begin 21:48:30 (approx) Wiggle complete 22:01:15 (approx) Switch back to HGA - still 1-way At least two attenuation changes. 22:14:00 (approx) Went 2-way 22:15:00 DSP idle Let me know if you have any questions. I have sent you copies of the wiggle plots that John made, haven't I? -Trish ----------------------------------------------------------------------- From rsimpson Thu Jan 23 12:36:00 1997 Date: Thu, 23 Jan 97 12:35:20 -0800 From: rsimpson (Richard Simpson) To: trish@zygra.jpl.nasa.gov Subject: Wiggle Test Cc: joe@nova, rsimpson Status: R The frequency and amplitude of the residuals in the plot you FAXed from John Armstrong look a lot like ours (from yesterday). But the details differ -- our envelope is flatter, his decay has more structure. Both may result from our having used more averaging. ------------------------------------------------------------------------- From Carl.Kloss-Jr@jpl.nasa.gov Thu Jan 30 10:18:48 1997 Date: Thu, 30 Jan 97 10:18:46 -0800 Received: from [137.78.144.45] by eis-msg-003.jpl.nasa.gov (Netscape Mail Server v2.02) with ESMTP id AAA20458; Thu, 30 Jan 1997 10:18:39 -0800 X-Sender: ckloss@pop.jpl.nasa.gov Message-Id: In-Reply-To: <9701291750.AA11999@magellan.Stanford.EDU> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: rsimpson@magellan.stanford.edu (Richard Simpson) From: Carl Kloss Jr Subject: re: USO temp drop Cc: trish@zygra.jpl.nasa.gov, Tom.E.Thorpe@jpl.nasa.gov Status: RO Richard, I am not concerned about the drop in temperature of the USO. We continue to cool on the Nadir panel due to increased shading by the HGS and the HGA gimbals as the SPE (sun, probe, earth) angle decreases, which is also the reason the 100 minute oscillations are dissappearing. The SPE angle will continue to drop until about mid February, and then it will increase slowly, to about 45 degrees maximum, which should return the temperature oscillations somewhat. However, we are slowly leaving the sun, and that will reduce the contribution of the sun during ANS when the SPE angle increases again (as apposed to the same angle in January). Also, the drop in temperature you note below is caused by the MOC bakeout heater turnoff. This was a 52 watt heater which caused the USO to increase in temperature on days 22/23. The USO is directly below the MOC under the Nadir panel, and there is some thermal coupling, specially when parts of the MOC decrease in temperature by up to 105 degrees C. During thermal vacuum testing, the lowest temperature during the cold cruise phase was 7 degrees C. for the USO. I would expect we will approach that in flight as we get further from the sun. Hope you had a good vacation. Cheers, Carl ________________________ >T-0315 161 166 168 1.36E+01 1.42E+01 1.57E+01 1.44E+01/1.04E-02 >2882 > > Median USO temperature (T-0315) has taken a big drop (-2.1C since >yesterday) to 14.2C. Most of the anomalously high temperature period >starting around 13h was not captured by this session of tracking; but even >the minimum USO temperature has dropped from 15.4C to 13.6C in the past 24 >hours. The 100-minute oscillation is now almost impossible to see in plots >of T-0315 values. Carl Kloss Jr. JPL MS 264-214, Ph 818 393-5919, Fax 818 393-5247, email = ckloss@pop.jpl.nasa.gov