MalVeauX Posted March 14, 2021 Share Posted March 14, 2021 Heya, AR2808 is an interesting region, in HA it has a nice extensive plage and has filaments between the poles, but in the photosphere it's a tiny pore with not much else to see. Mean while, a smaller region that is now AR809 emerged and has a much smaller HA representation with a tiny plage and the poles are close together, yet in the photosphere it has a much bigger spot that is developing rapidly this morning (maybe it will grow larger and the poles separate a bit more to become a bigger region). It's a really great representation of the difference between the chromosphere and photosphere, and how there's always something to see in HA! The HA is high contrast by stacking two 1.7A blocking filters (from Apollo Lasky) with a single etalon to produce nearly double-stack performance in terms of suppressing the parasitic continuum. Colored: Timelapse (3 minutes real time) of AR2808: Seeing: Equipment: 120mm F10 Refractor Internal Subaperture D-ERF, 50mm Baader Red CCD-IR Block filter (in focuser) PST etalon + two 1.7A blocking filters (from Apollo Lasky) stacked, one tilted in a Skybender IMX290 sensor (170 FPS) Very best, 1 Quote Link to comment Share on other sites More sharing options...
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