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From the very start of my solar observing, interest has been in viewing and imaging solar prominences. To this end I acquired a Daystar 0.8A bandpass H-alpha filter for my 4 inch refractor, the broad bandwidth being well suited for prominence observ…
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From the very start of my solar observing, interest has been in viewing and imaging solar prominences. To this end I acquired a Daystar 0.8A bandpass H-alpha filter for my 4 inch refractor, the broad bandwidth being well suited for prominence observing. Any, and all solar prominences are of interest, but I am particularly keen on observing the evolution of quiescent prominences.
Of particular interest are high latitude prominences with classic vertical sheet filament threads and the curious bubble voids that can often be observed at the prominence base. As these bubble voids develop they often go through periods of growth, then disruption leading to partial or total collapse, then amazingly will often re-inflate and repeat the cycle. One result of the bubble disruption and collapse are the production of dark plumes that will rapidly rise up between the filament threads, some reaching the top of the filament and disappearing from view. According to the papers I have read, the bubble voids contain coronal temperature material that is both less dense and hotter than the prominence filament threads, explaining, at least in part, the buoyant behavior of both the bubble and rising plumes. Another interesting feature is the accumulation at the top of the bubble from down flow plasma. The accumulations can often be seen to slide off the top and down the side of the bubble to the base of the prominence.
https://www.flickr.com/photos/8091438@N04/albums
retired material science lab technician
solar astronomy, stellar spectroscopy, model railroading....and, Sushi.