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Voyager Enters Final Frontier Of Solar System
remcook
post Dec 2 2011, 08:37 AM
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Great, still doing good science!
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JTN
post Dec 3 2011, 01:30 AM
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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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stevesliva
post Dec 3 2011, 02:49 AM
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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 range.
One anode covers 9.26 . 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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Paolo
post Dec 3 2011, 08:54 AM
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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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MarcF
post Dec 13 2011, 10:43 AM
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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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hendric
post Dec 13 2011, 07:03 PM
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QUOTE (MarcF @ Dec 13 2011, 04:43 AM) *
It's getting really exiting


Best UMSF Freudian slip ever. smile.gif


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MarcF
post Dec 13 2011, 08:37 PM
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Hehehe ! Oups !! This loss of C was really not deliberate !!
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volcanopele
post Dec 13 2011, 09:59 PM
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I wouldn't call that a Freudian slip, but that certainly goes on the list of best puns (albeit unintentional) of the year.


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ups
post Dec 17 2011, 07:14 PM
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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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MarcF
post Jun 20 2012, 07:03 PM
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Ever closer... rolleyes.gif
http://www.jpl.nasa.gov/news/news.cfm?release=2012-177
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Marc.
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dilo
post Jun 21 2012, 04:58 AM
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QUOTE (MarcF @ Jun 20 2012, 08:03 PM) *
Ever closer...

I think they refers, in particular, to high energy proton flux:
Attached Image

extracted from here:
Attached File  v1_1d_08_on_8ion.pdf ( 106.9K ) Number of downloads: 130


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MarcF
post Aug 7 2012, 03:49 PM
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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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dilo
post Sep 1 2012, 07:04 AM
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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


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Astro0
post Sep 5 2012, 07:13 AM
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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 smile.gif

Sail on lil' Voyagers! Sail on!
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RoverDriver
post Sep 5 2012, 07:33 AM
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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


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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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