Quote:
On 2002-10-25 10:16, David Hall wrote:
I second what Jerod said. Often recently I've seen images with "bars" of some kind on them. I figured they were probably just stars, but I couldn't understand why they appeared that way instead of with the familiar defraction spikes I'm used to. Now I know. Thanks for edumacating us.
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Most of the time (from what I've noticed perusing the Soho site) these spikes and bars are associated with planets crossing SOHO's field of view. In this animation, Venus glides by SOHO's C3 coronagraph. You can clearly see the aforementioned image artifacts associated with a bright object like Venus. Another bright object appears (with similar spikes) from the left at the end of the animation. I'm not sure which planet that is (perhaps Mercury?), but it goes to show that thses types of things show up in SOHO images all the tme.
http://science.nasa.gov/spaceweather...nus_c3_big.gif
(edited to correct downright horrible spelling)
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<font size=-1>[ This Message was edited by: heliopause on 2002-11-11 08:15 ]</font>
<font size=-1>[ This Message was edited by: heliopause on 2002-11-11 08:16 ]</font>