Voyager Enters Final Frontier Of Solar System |
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Voyager Enters Final Frontier Of Solar System |
 Dec 2 2011, 08:37 AM
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#61
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Rover Driver  Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47  |
Great, still doing good science!
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Dec 3 2011, 01:30 AM
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#62
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Member Group: Members Posts: 200 Joined: 20-November 05 From: Mare Desiderii Member No.: 563 |
Curious to know if the measurements form anything that could be described as an image. Does the full article say -- anyone have Science access? (I can't tell from the free online supplement.)
Measurements are said to be taken with the ultraviolet spectrometer (UVS). This page quotes FOV as 0.10° × 0.87°, so maximum spatial resolution would be pretty coarse. From hints in the supplement, I guess the data are much coarser. This page (date unknown) says: "data is being collected from the Ultraviolet Spectrometer Subsystem (UVS). While there are no science investigation teams associated with this instrument, the captured data is made available to interested scientists." If this was true at the time the relevant measurements were taken, I guess they might not have been chosen with this investigation in mind? New Scientist says the instruments have since been turned off (corroborated by this page: V1 1998, V2 2002). |
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Dec 3 2011, 02:49 AM
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#63
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Senior Member Group: Members Posts: 1580 Joined: 14-October 05 From: Vermont Member No.: 530 |
http://vega.lpl.arizona.edu/voyager_uvs/instrument.html
It's pulse counting on the 128 channels that form the spectrum. From the supplement: QUOTE For our specific purpose of a high precision and bias-free Ly determination we have devised a new reduction and analysis pipeline, improved from the technique used earlier (33). The Voyager UVS (Ultra-Violet Spectrometer) has a field of view of 0.1x0.87 defined by a mechanical grill collimator. Light that passes through the collimator reaches a concave grating, which disperses and focusses the light onto the microchannel plate (MCP) detector. A single photo-electron created at the input of the MCP generates a pulse of many electrons at the output, and this charge is collected on a linear array of 128 elongated anodes (channels) that correspond to the 540 to 1700 Å range. One anode covers 9.26 Å. Charges on the anodes are periodically sampled and subjected to threshold detection; detected events are summed into 128 corresponding memory locations to form a spectrum. So no, not really a picture. And that is coupled with two Azimuth directions. |
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Dec 3 2011, 08:54 AM
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#64
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 Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
QUOTE (JTN @ Dec 3 2011, 02:30 AM)  Curious to know if the measurements form anything that could be described as an image. Does the full article say -- anyone have Science access? (I can't tell from the free online supplement.) there is an image in the paper (fig. 2, for those having access) showing "Scan data point directions superimposed on" a hydrogen-alpha map of the sky. Scan data points are colorized to indicate "the intensity of the continuum, with red indicating its absence and blue the most intense". no real image, actually... as for the date scans were taken, Voyager 1 operated between 1993 and mid-2003 and V2 between 1993 and mid-1998. |
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Dec 13 2011, 10:43 AM
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#65
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
It's getting really exiting !! Not long to wait now before historical entry into the interstellar medium !!
NASA'S VOYAGER HITS NEW REGION AT SOLAR SYSTEM EDGE http://voyager.jpl.nasa.gov/news/new_region.html Best regards, Marc. |
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Dec 13 2011, 07:03 PM
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#66
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 Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
QUOTE (MarcF @ Dec 13 2011, 04:43 AM) It's getting really exiting Best UMSF Freudian slip ever. 
-------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Dec 13 2011, 08:37 PM
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#67
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
Hehehe ! Oups !! This loss of C was really not deliberate !!
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Dec 13 2011, 09:59 PM
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#68
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 Senior Member Group: Moderator Posts: 3228 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
I wouldn't call that a Freudian slip, but that certainly goes on the list of best puns (albeit unintentional) of the year.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Dec 17 2011, 07:14 PM
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#69
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 Member Group: Members Posts: 115 Joined: 8-January 05 From: Austin | Texas Member No.: 138 |
It's amazing that the science coming from the Voyagers hasn't really egressed in the 30+ years they've been in service.
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Jun 20 2012, 07:03 PM
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#70
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
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Jun 21 2012, 04:58 AM
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#71
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 Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
QUOTE (MarcF @ Jun 20 2012, 08:03 PM) Ever closer... I think they refers, in particular, to high energy proton flux:
extracted from here: 
v1_1d_08_on_8ion.pdf ( 106.9K )
Number of downloads: 761-------------------- I always think before posting! - Marco -
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Aug 7 2012, 03:49 PM
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#72
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
And more signs that "we" are almost in the interstellar medium...
http://voyager.jpl.nasa.gov/news/signs_changing_fast.html Best regards, Marc. |
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Sep 1 2012, 07:04 AM
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#73
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
At the end of August we had another two drops of low-energy protons, even deeper than one month ago!
http://sd-www.jhuapl.edu/VOYAGER/images/vg...d_avg_09_on.pdf -------------------- I always think before posting! - Marco -
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Sep 5 2012, 07:13 AM
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#74
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 Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
Voyager 1 marks 35 years since launch and joining Voyager 2 on the Grand Tour of the Solar System.
http://voyager.jpl.nasa.gov/news/voyager_35.html A new banner to mark the milestone Sail on lil' Voyagers! Sail on! |
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Sep 5 2012, 07:33 AM
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#75
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 Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
I think that Voyagers are the coolest mission. Whenever I go to the Von Karman here at JPL where they have a replica I'm always amazed by their size.
Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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