Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from hogtown.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Sat, 6 Jul 91 05:42:43 -0400 (EDT) Message-ID: <0cRN2C-00WBwALmU4B@andrew.cmu.edu> Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Sat, 6 Jul 91 05:42:38 -0400 (EDT) Subject: SPACE Digest V13 #796 SPACE Digest Volume 13 : Issue 796 Today's Topics: Re: NASA Headline News for 06/24/91 (Forwarded) Aviation Week on Galileo Asteroid grazed atmosphere in 1972? Stanford Mars Landing Report Available? Research asst. positions w/NASA satellite project, UC Berkeley Re: Aurora geometry Programmer positions w/NASA satellite project at UC Berkeley Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription requests, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Date: 26 Jun 91 21:50:30 GMT From: cis.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!elroy.jpl.nasa.gov!jato!kelvin.jpl.nasa.gov!baalke@ucbvax.Berkeley.EDU (Ron Baalke) Subject: Re: NASA Headline News for 06/24/91 (Forwarded) In article <887@newave.UUCP>, john@newave.UUCP (John A. Weeks III) writes... >In <1991Jun24.225434.18796@news.arc.nasa.gov> yee@trident.arc.nasa.gov (Peter E. Yee) kindly posts: >> Headline News > >> [...] JPL continues its anomaly investigation into the cause and >> possible fixes for the partial deployment of the spacecraft's high gain >> antenna. The data from the Gaspra flyby can be recorded onboard the >> spacecraft, for later playback at the second Earth encounter in >> December, 1992. > >Does anyone know if the data playback during the second Earth fly-by is going >to affect the ability to collect data on the second Earth encounter? The >first Earth encounter was spectacular (actually the Moon photos were the >part I liked)...it would be a shame to miss part of the second fly-by. > The Gaspra playback will not inhibit Galileo's data collection for the second Earth flyby. In fact, a similiar thing was already done with the first Earth flyby, where the Venus data was played back just prior to the flyby. ___ _____ ___ /_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov | | | | __ \ /| | | | Jet Propulsion Lab | ___| | | | |__) |/ | | |__ M/S 301-355 | "Imagination is more /___| | | | ___/ | |/__ /| Pasadena, CA 91109 | important than knowledge" |_____|/ |_|/ |_____|/ | Albert Einstein ------------------------------ Date: 26 Jun 91 10:53:53 GMT From: cis.ohio-state.edu!zaphod.mps.ohio-state.edu!rpi!bu.edu!transfer!lectroid!sw.stratus.com!tarl@ucbvax.Berkeley.EDU (Tarl Neustaedter) Subject: Aviation Week on Galileo Excerpted From Aviation Week, June 24, page 54 After mentioning that the Oct. 29 Gaspra encounter will be recorded and not broadcast directly (regardless of whether they free the antenna soon, due to planning restrictions), a comment on why the antenna is stuck: High friction caused by galling between standoff pins on the antenna ribs and their conical receptacles on the antenna center structure is the likely cause for the stuck 16-ft-dia antenna, according to William J. O'Neil, Galileo project manager at the Jet Propulsion Laboratory. Differential heat expansion between the graphite ribs and the aluminum/beryllium center structure is believed to have locked some of the titanium pins in the receptacles as the center structure cooled and shrunk when Galileo traveled away from the Sun. But as the antenna ribs were driven open, the stuck ribs bent, rotating the pin forces from the top to the bottom of the receptacle, according to the latest scenario. Previously, engineers thought the center structure should be warmed and expanded to free the ribs, and this was tried unsuccessfully in late May. Now they think the center structure should be contracted because the main loads are believed to be on the bottom, instead of the top, of the receptacles. Pointing Galileo's high-gain antenna away from the Sun should provide enough cooling, and this may be done this summer. Engineers are also studying the natural frequency of the ribs and how they might be moved to jiggle them free. [Perhaps having it play Strauss' Also Sprach Zarathustra? :-) ] Anyway, they also show a self-portrait of galileo by it's infrared mapping spectrometer, but from before the attempted antenna deployment. Terrible resolution, but interesting that Galileo can take "pictures" of itself. -- Tarl Neustaedter tarl@vos.stratus.com Marlboro, Mass. Stratus Computer Disclaimer: My employer is not responsible for my opinions. ------------------------------ Date: 26 Jun 91 12:55:12 GMT From: dftsrv!amarna.gsfc.nasa.gov!packer@g.ms.uky.edu (Charles Packer) Subject: Asteroid grazed atmosphere in 1972? Last Tuesday there was an article about the danger of an asteroid hitting Earth published in the New York Times. It contains this statement: "In 1972 a large asteroid, estimated at up to 260 feet in diameter, or nearly the length of a football field, zipped through the upper atmosphere over the northern United States and Canada, blazing across the sky in a daylight fireball witnessed by thousands of people before it re-entered space." I checked the Times's own annual Index for 1972 and found nothing about this under any related heading. There was one occurrence mentioned in which (have you stopped laughing about the 260-foot "large asteroid?") "400 shooting meteors" were seen over Japan on Oct. 8. Anybody know if there's anything to the asteroid story? ------------------------------ Date: 26 Jun 91 19:50:52 GMT From: cis.ohio-state.edu!zaphod.mps.ohio-state.edu!think.com!snorkelwacker.mit.edu!bloom-picayune.mit.edu!news@ucbvax.Berkeley.EDU (Matthew T Velazquez) Subject: Stanford Mars Landing Report Available? From a recent posting in clari.tw.space: > WASHINGTON (UPI) -- An international effort could land the first human >exploration team on Mars and establish a permanent base on the Red >Planet within 21 years, a report concluded Wednesday. Does anybody know where I could get my hands on a copy of this report? I have several graduate projects from 1985 to describe the establishment of a Mars base in conjunction with a lunar base, asteroid mining, and the space station, and I would be very interested in seeing what the guys from Stanford and the USSR have to say about it in 1991. Any help at all would be appreciated. AtDhVaAnNkCsE, T Velazquez MIT Aero/Astro brndlfly@athena.mit.edu "The art of engineering is knowing when to lie, and by how much." -Ken Meltsner ------------------------------ Date: 26 Jun 91 21:38:40 GMT From: agate!usenet@ucbvax.Berkeley.EDU (EUVE jobs) Subject: Research asst. positions w/NASA satellite project, UC Berkeley Map the Unseen Universe The Extreme Ultraviolet Explorer (EUVE) Project is looking for talented and enthusiastic professionals to join our team in exploring and documenting stars and galaxies as they have never been seen before. EUVE is a NASA satellite scheduled for launch in December 1991. Its four telescopes were designed and built at the Space Sciences Laboratory of the University of California, Berkeley. These high-tech instruments will scan the sky in the first-ever study of the extreme ultraviolet, a band of the spectrum that cannot be seen from Earth. Discoveries await us in this previously unexplored region of space. Among the challenges of the EUVE mission is the development of software to interpret the data gathered by the satellite. This software will be used to study the entire sky, creating a map of the locations and intensities of stars and other astronomical sources emitting EUV radiation, and to convert photon events into meaningful data for in-depth scientific study. The following positions are available: STAFF POSITIONS These jobs require a background in Astronomy, Physics, Math, Computer Science, or a related field. In addition, applicants must be familiar with the UNIX operating system and have experience with C and/or FORTRAN. Multiple positions are available. RESEARCH ASSISTANT Box # 12-215-218-22 Q Work on a scientific team for reducing and analyzing EUVE spectrometer data for the Guest Observer Program. Coordinate data processing activities of space- and ground-based astronomical observations and assist in using software for scientific analysis of data. Integrate instrument calibration data into an evolving software package; test integrated astronomical software. Assist with evaluation of Guest Observer proposals. REQUIRED: Related work experience on an astronomical satellite project. DESIRABLE: Knowledge of IRAF. RESEARCH ASSISTANT Box # 03-214-218-22 Support the processing of EUVE satellite data from raw telemetry into skymaps, source catalogs, time-tagged photon files, and spectra. Monitor the data processing flow, help detect previously unknown EUV sources, assist in the understanding of spacecraft aspect, produce skymaps in multiple bandpasses, produce a history file database, develop data processing strategies with the staff scientists. REQUIRED: Experience with C or Bourne shell scripts. DESIRABLE: Experience with data reduction and analysis techniques with astronomical packages. **************************************************************** All jobs are located at the Center for EUV Astrophysics on the UC Berkeley campus. To apply, send a resume and three references to the UC Employment Office, 2539 Channing Way, Berkeley, CA 94720. Cite the box number given for the position. You may also send an *informational* copy of your resume and cover letter by email to euvejobs@ssl.berkeley.edu. However, official applications MUST go through the UC Employment Office at the address given above. Please confirm in your email to euvejobs that you have followed the official application process. THE UNIVERSITY OF CALIFORNIA IS AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER ------------------------------ Date: 26 Jun 91 18:44:31 GMT From: mailer.cc.fsu.edu!geomag!cain@gatech.edu (Joe Cain) Subject: Re: Aurora geometry In article <1820086@hpldsla.sid.hp.com> tonya@hpldsla.sid.hp.com (Tony Arnerich) writes: >The Aurora is an atmospheric phenomenon (ionosphere? stratosphere?), >therefore it is a local phenomenon. As I understand it, it generally >takes the form of a ring, more or less centered on the magnetic pole. A good reference for the novice to such matters is the little book "The Solar Wind and the Earth" (Kamidi and Akasofu, eds) published in 1987 by Terra. The reference list in their chapter also mentions the older book by Jones, "The Aurora" 1974. The aurora is a map of a portion of the magnetosphere into the polar regions. The bottom of the glow is almost always about 100 km, though the upper regions can range from 400 to over 1000 km. Thus it spans from the ionospheric E layer into the F and is never a stratospheric phenomenon. The direction of the rays is that of the local magnetic field at that altitude. The auroral oval is a statistical concept, and besides being not a circle, centers according to the field at higher altitudes, or generally shifted towards the dark side maybe 300 km from the dipole pole (sounds redundant). There are observed "theta" aurorae from the Dynamics Explorer satellite which form a complete ring, though significant changes occur on the portion that happens to be experiencing a "substorm." The patterns are similar to the statistical, but there is a different appearance on the day and night portions. The latitude of the glow depends on the stage of the substorm, intensity, local time, etc. Joseph Cain cain@geomag.gly.fsu.edu cain@fsu.bitnet scri::cain ------------------------------ Date: 26 Jun 91 21:27:44 GMT From: agate!usenet@ucbvax.Berkeley.EDU (EUVE jobs) Subject: Programmer positions w/NASA satellite project at UC Berkeley Map the Unseen Universe The Extreme Ultraviolet Explorer (EUVE) Project is looking for talented and enthusiastic professionals to join our team in exploring and documenting stars and galaxies as they have never been seen before. EUVE is a NASA satellite scheduled for launch in December 1991. Its four telescopes were designed and built at the Space Sciences Laboratory of the University of California, Berkeley. These high-tech instruments will scan the sky in the first-ever study of the extreme ultraviolet, a band of the spectrum that cannot be seen from Earth. Discoveries await us in this previously unexplored region of space. Among the challenges of the EUVE mission is the development of software to interpret the data gathered by the satellite. This software will be used to study the entire sky, creating a map of the locations and intensities of stars and other astronomical sources emitting EUV radiation, and to convert photon events into meaningful data for in-depth scientific study. The following positions are available. STAFF POSITIONS Both jobs require a background in Astronomy, Physics, Math, Computer Science, or a related field. In addition, applicants must be familiar with the UNIX operating system and have experience with C and/or FORTRAN. SCIENTIFIC PROGRAMMER Box # 05-212-217-22 Q Work with a team of programmers and scientists to develop novel algorithms and software to analyze the imaging data from the EUVE all-sky survey. Both production programs, which must operate autonomously in a real-time pipeline, and interactive programs are included in the scope of this project. This experienced programmer will work on original methods for finding new astronomical objects amid the noise of geophysical and astronomical background, construction and display of false- color sky maps, measurement of positions and intensities of stars using complex point spread functions, quantifying the time variability of sources, and detection of diffuse EUV emission structures. REQUIRED: Demonstrated scientific programming ability in C. Multiple positions available. SCIENTIFIC PROGRAMMER Box # 07-200-22 Q Work closely with a small team of scientists to design portable software for the project's Guest Observer Program. Responsible for collaborating with scientists to implement innovative algorithms for image processing of event-oriented data. This position requires a programmer who can work independently to develop software to analyze spectrometer data; perform image processing to calibrate observations; and develop user interfaces that allow scientists to select observational data. Assist with theoretical modeling to solve complex tasks of scientific data analysis. REQUIRED: Demonstrated scientific programming ability, preferably in C. DESIRABLE: Familiarity with IRAF. **************************************************************** All jobs are located at the Center for EUV Astrophysics on the UC Berkeley campus. To apply, send a resume and three references to the UC Employment Office, 2539 Channing Way, Berkeley, CA 94720. Cite the box number given for the position. You may also send an *informational* copy of your resume and cover letter by email to euvejobs@ssl.berkeley.edu. However, official applications MUST go through the UC Employment Office at the address given above. Please confirm in your email to euvejobs that you have followed the official application process. THE UNIVERSITY OF CALIFORNIA IS AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER ------------------------------ End of SPACE Digest V13 #796 *******************