Hi, I took this image of Thors helmet last night Ha, O111, Hb all 3minutes , all 20 subs. I haven't finished processing yet and hope to improve the colour. There are two problems I don't know what to do about. First the background is streaky. I have heard this may be due to temperature variation of the sensor and as it was hot last night the cooler at max shifted from -14 deg to -18 over the 3 hours. I have also read it could be flexure in the guide scope. Secondly there are a number of 3 coloured streaks where something has moved over the 3 hours. Are these hot pixels? If so any advice on removing them. I have Pixinsight but am only just starting to learn it. Image taken Sky Watcher Esprit APO150 EQ8 mount ZWO ASI 1600mm-c. Guiding was via a 80mm 600mmFL refractor mounted on top with an Orion pro auto guider and PHD2. Sorry I don't frequent forums often and I couldn't work out how to attach a reasonable size copy of the image so I have pasted a drop box link to the image. Will that do?
https://www.dropbox.com/s/ym448vhe3x...20RGB.jpg?dl=0