Results 1 to 4 of 4

Thread: SOHO images Stilll better than Solar Dynamics Observatory images...

  1. #1
    Join Date
    Oct 2006
    Posts
    94

    SOHO images Stilll better than Solar Dynamics Observatory images...

    I suspect it has something to do with how the images are processed before being posted online, but the 15 year old SOHO images show more detail.

    http://sohowww.nascom.nasa.gov//data...it304_1024.jpg

    http://sdowww.lmsal.com/sdomedia/Sun...6/09/l0304.jpg

  2. #2
    Join Date
    May 2005
    Location
    N.E.Ohio
    Posts
    22,006
    Quote Originally Posted by beethovenspiano View Post
    I suspect it has something to do with how the images are processed before being posted online...
    Bingo... the images are the same size. The SOHO image is compressed to 666Kb, and the SDO is compressed to 254Kb.
    Or, over 2-1/2 times the resolution.
    Quote Originally Posted by beethovenspiano View Post
    ...but the 15 year old SOHO images show more detail.
    The real question is if the raw data that the scientists use have more detail in one over the other (and not just visually).

  3. #3
    Join Date
    Oct 2006
    Posts
    94
    Im referring to prominences around the limb. A very large one can be seen in the SOHO image, but its hardly visible in the SDO images. Contrast in the images looks very high. This really only applies to the 304 UV images, other wavelengths have stunning detail.

  4. #4
    Join Date
    Sep 2003
    Location
    The beautiful north coast (Ohio)
    Posts
    50,090
    As I understand it, the Solar Dynamics Observatory is designed to have different capabilities than SOHO and I don't think it is particularly to observe more detail. It observes at a very wide variety of wavelengths and very frequently.

    This webpage lists all the instruments.
    SDO contains a suite of instruments that will provide observations leading to a more complete understanding of the solar dynamics that drive variability in the Earth's environment. This set of instruments will:

    1. Measure the extreme ultraviolet spectral irradiance of the Sun at a rapid cadence
    2. Measure the Doppler shifts due to oscillation velocities over the entire visible disk
    3. Make high-resolution measurements of the longitudinal and vector magnetic field over the entire visible disk
    4. Make images of the chromosphere and inner corona at several temperatures at a rapid cadence
    5. Make those measurements over a significant portion of a solar cycle to capture the solar variations that may exist in different time periods of a solar cycle
    For example, there is the following from the wikipedia article on it, about the Extreme Ultraviolet Variability Experiment instrument:
    The instrument provides improvements of up to 70 percent in spectral resolution measurements in the wavelengths below 30nm, and a 30 percent improvement in "time cadence" by taking measurements every 10 seconds over a 100 percent duty cycle.
    At night the stars put on a show for free (Carole King)

    All moderation in purple - The rules

Similar Threads

  1. Replies: 0
    Last Post: 2011-Apr-25, 12:40 PM
  2. SDO - Solar Dynamics Observatory
    By 01101001 in forum Space Exploration
    Replies: 52
    Last Post: 2010-Apr-22, 05:45 AM
  3. The Solar Dynamics Observatory in 3.5 Minutes
    By Fraser in forum Universe Today
    Replies: 0
    Last Post: 2010-Jan-29, 11:30 PM
  4. Solar Dynamics Observatory
    By beethovenspiano in forum Space Exploration
    Replies: 0
    Last Post: 2009-Nov-30, 12:00 AM
  5. Solar Dynamics Observatory
    By ToSeek in forum Space Exploration
    Replies: 6
    Last Post: 2008-Mar-05, 03:32 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •