It is currently Tue Feb 20, 2018 12:02 am

All times are UTC




Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: The Sun in October 2014
PostPosted: Sun Oct 05, 2014 3:54 pm 
Offline
Member
User avatar

Joined: Mon Oct 12, 2009 6:47 pm
Posts: 1248
Location: Bolton
This afternoon I took a break from gardening to have a look at the Sun through our H-alpha telescope. I could see a few filaments and one very large prominence, so I had a go at capturing an image through the hazy cloud with our webcam:
Attachment:
File comment: Solar image from 5-Oct-2014, taken with BAS Trust webcam and Coronado SM60. It's only just possible to fit the whole disk onto the webcam chip!
sun_5oct.jpg
sun_5oct.jpg [ 236.15 KiB | Viewed 1975 times ]
As the 8-bit camera has a limited dynamic range (only 256 levels), I needed to record a pair of 250-frame .AVI sequences: one with the camera gain set low to capture the detail on the disk and the other in high-gain mode to get the faint prominences.
Attachment:
File comment: Processed image of solar disk, with camera in low-gain mode.
disk.jpg
disk.jpg [ 57.34 KiB | Viewed 1967 times ]
Attachment:
File comment: Processed image of solar prominences, with camera in high-gain mode
rim.jpg
rim.jpg [ 24.3 KiB | Viewed 1967 times ]

I'd used the camera in monochrome mode, so in IRIS I loaded the disk image into the Green field and the prominences into the Red (and turned off the Blue) to get this "creme brule" colour effect.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group