SDO, (Solar Dynamics Observatory) |
SDO, (Solar Dynamics Observatory) |
Guest_Sunspot_* |
May 10 2010, 06:40 PM
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#91
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cool |
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May 10 2010, 08:49 PM
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#92
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Oh man, like my hard drive wasn't groaning already...
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May 11 2010, 07:08 PM
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#93
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
VERY chuffed - and honoured - to have my "First Light" poem featured on the SDO Website... http://sdo.gsfc.nasa.gov/mission/project/leostatus.php -------------------- |
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May 11 2010, 08:23 PM
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#94
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Well done, Stu!
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Guest_Sunspot_* |
May 22 2010, 07:42 PM
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#95
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http://sdo.gsfc.nasa.gov/data/
The SDO site now has access to images, although its listed as "the sun now" they are about 36 hours old. |
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Guest_Sunspot_* |
May 24 2010, 04:06 PM
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#96
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Guests |
Some fantastic magnetic loops visible in the "193" images today
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Guest_Sunspot_* |
Jun 1 2010, 07:23 AM
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#97
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The SDO images have been looking a little odd lately, not sure if its a processing issue before they go onto the web or what. Looking badly overexposed.
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Jun 1 2010, 01:34 PM
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#98
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Maybe the sun is too bright?
<ducks> -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Guest_Sunspot_* |
Jun 10 2010, 07:24 AM
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#99
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Jun 10 2010, 02:50 PM
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#100
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Gorgeous pic, thanks!
I was really tthinking about buying a solar telescope, but can't help wondering "What's the point, when I can enjoy the view via SDO?" But I'm one of those people who actually finds more enjoyment and satisfaction in seeing Jupiter's belts and moons for real, through my own 4.5" reflector, than I do from looking at a Hubble portrait, so I'll probably still get one... some day... -------------------- |
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Jun 11 2010, 12:30 PM
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#101
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Junior Member Group: Members Posts: 94 Joined: 15-October 09 Member No.: 4979 |
I agree- there's nothing like the experience of seeing/imaging the Sun, Moon, or planets yourself compared to images produced by spacecraft. SDO is great, but the beauty of owning your own solar scope is you can watch changes occur on the Sun in real time. A good, small solar hydrogen-alpha scope is very affordable nowadays.
I use an old Coronado PST and a webcam to record prominences, filaments, and active regions on the Sun every day it's clear (and something interesting is visible). Here's a mosaic I took last week using this combination. BTW, the scope, camera, and tracking mount I use cost a total of just under $1000 US. |
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Guest_Sunspot_* |
Jun 12 2010, 12:07 AM
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#102
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Jun 13 2010, 11:56 AM
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#103
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Junior Member Group: Members Posts: 95 Joined: 5-September 07 Member No.: 3662 |
I agree- there's nothing like the experience of seeing/imaging the Sun, Moon, or planets yourself compared to images produced by spacecraft. SDO is great, but the beauty of owning your own solar scope is you can watch changes occur on the Sun in real time. A good, small solar hydrogen-alpha scope is very affordable nowadays. I use an old Coronado PST and a webcam to record prominences, filaments, and active regions on the Sun every day it's clear (and something interesting is visible). Here's a mosaic I took last week using this combination. BTW, the scope, camera, and tracking mount I use cost a total of just under $1000 US. Could you share more on how you made this mosaic? Other than an adapter for the webcam, did you need anything very special? What software did you use, and were there any non-transparent steps (e.g., removal of aberrations due to vignetting, etc.)? We have a PST, and I would love to be able to use it for this kind of thing. Many thanks! Jeff |
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Jun 14 2010, 03:50 PM
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#104
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Junior Member Group: Members Posts: 94 Joined: 15-October 09 Member No.: 4979 |
Sure Jeff-
first, I used a very short 2x barlow to increase the image scale. Had to be very short because the PST doesn't have much back focus. I shot 9 short videos with the DMK; each were about 600 frames long. These had generous overlap between each because the PST has very uneven illumination across the field; it's not vignetting, the problem is the narrowest region of bandpass is pretty small on the PST, so I tune the "sweet spot" to be at about the middle of the image, and simply use large overlap and crop out the areas that I don't use. Also, choose an exposure that doesn't overexpose bright regions on the solar sisk and use the same setting for all your videos; this avoids problems with overlap between frames. After taking the videos, I bring them into the freeware RegiStax and stack the best 150-200 frames per video, and sharpen them gently using wavelets. Next, I bring the stacked images into Photoshop (or Gimp, if you prefer) and align each frame, then cut off the areas of each I don't want to keep. Finally, because I use a monochrome camera, I colorize the sun for aesthetics. I like a yellow sun with orange/red prominences and filaments. This last step is completely arbitrary; remember the PST looks at a narrow slice of the red spectrum (656.4 nm, less than 1 angstrom). Visually, the sun appears dark red, but the eye doesn't see contrasts well in red, so thus I colorize the image to improve visual contrast. |
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Guest_Sunspot_* |
Jul 13 2010, 03:56 PM
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#105
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