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Originally posted by thekraziekc
reply to post by K-PAX-PROT
Hello im new to the forums and wanted to add a recent email i got from NASA in regards to questions I had with objects in their stereo images. cocky attitudes with nothing but BS if you ask me.
Regarding your question about STEREO images:
You are looking at the full spatial resolution (2048 x 2048 pixel), less lossily compressed (second image you attached) and 4 x 4 pixel binned (-> 512 x 512 resolution, for some reason I've never understood, displayed on the site as any size you want), extremely lossily compressed (first image) versions of the same data from one of the STEREO SECCHU EUVI instruments.
The difference is that we get the poor quality, lower resolution images in near-realtime through a minimal network of antenna partners at 633 bits per second, and the full resolution, better quality images through NASA Deep Space Network, currently at 240 kilobits per second, but not until ~ 3 days after they were obtained --- it's just the way the onboard data store optimization works. as a result, the near-realtime "beacon mode" images have to be much more heavily (and lossily) compressed than images in the the "normal" telemetry.
If you had read:
about the beacon mode images (n7euA or n7euB in filenames) and how they're replaced on the Website with the full resolution images (n4euA or B) when those become available, you wouldn't have had to ask.
Likewise, if you'd read:
you'd see that the signatures of cosmic rays and solar energetic particle hits on the CCD detectors of the EUVI telescopes get compressed to the artifacts you probably think have been "retouched" out of the full-resolution images. Well, there never were features like that in the original (full resolution) images on board the spacecraft, for which the less lossily compressed, full-resolution images are a much better representation than the over-compressed, lower resolution beacon mode images.
You can find a report from the Jet Propulsion Laboratory on the lossy compression scheme ("ICER") used to compress these images; it was originally devised for the Mars Rovers at:
If you look at Figure 2(b), you can see the artifacts that are created when the image (nominally 8 or in the case of STEREO SECCHI EUVI, 16 bits per pixel) is compressed to 0.125 bits per pixel. The compression ratio for the beacon mode images is similar or even higher.
So to summarize: the second, larger image you sent is close to the "real" image on board the spacecraft, with only minor compression artifacts, and the first, smaller one, the space weather "beacon mode image," has numerous artifacts created by the compression algorithm when it tries to deal with apparently contrasty, sharp features such as cosmic ray or solar energetic particle hits.
No retouching, never was, never will be.
(Dr.) Joseph B. Gurman
STEREO Project Scientist
Originally posted by ToneDeaf
When I saw this, the first thing that came to mind was
NASA's mission to send a car sized projectile directly into the sun
and record the outcome. Wasn't this the mission ? The object
didn't move in a manner like a meteor, this one was more directional
and turned into the sun.
Anyone know when the NASA sun mission was scheduled for ?
you can clearly see it at 2011-05-10 @ 20:12
Also AMAZING giant flare on 2011-05-09 from 08:36 on just amazing
(flair @ about 20:00)
. . . for the newbies click LASCO C2 , start date 2011-05-09 end 2011-05-12
_____________edit on 12/5/11 by ToneDeaf because: (no reason given)edit on 12/5/11 by ToneDeaf because: (no reason given)edit on 12/5/11 by ToneDeaf because: (no reason given)
NASA Selects Investigations for First Mission to Encounter the Sun NASA has begun development of a mission to visit and study the Sun closer than ever before. The unprecedented project, named Solar Probe Plus, is slated to launch no later than 2018. The small car-sized spacecraft will plunge directly into the Sun’s atmosphere approximately four million miles from our star’s surface. It will explore a region no other spacecraft ever has encountered. NASA has selected ﬁ ve science investigations that will unlock the Sun’s biggest mysteries. “The experiments selected for Solar Probe Plus are speciﬁ cally designed to solve two key questions of solar physics — why is the Sun’s outer atmosphere so much hotter than the Sun’s visible surface, and what propels the solar wind that affects Earth and our solar system?” said Dick Fisher, director of NASA’s Heliophysics Division in Washington. “We’ve been struggling with these questions for decades and this mission should ﬁ nally provide those answers.” As the spacecraft approach
A comet goes in; a CME comes out. Coincidence? Probably, yes, the sequence was coincidental. The comet disintegrated as much as a million kilometers above the stellar surface. There's no known way that the wispy, vaporous remains of a relatively lightweight comet could cause a billion-ton cloud of hot plasma to fly away from the sun at 400 km/s (the observed speed of the CME). Moreover, NASA's Solar Dynamics Observatory photographed the eruption that did propel the CME into space. There's no comet in the field of view of this must-see movie