Another AR of the new 25th solar cycle showed up on 2015 August 14. Amazingly, for new sunspots of a new cycle, both this group and the AR12365 that showed up on 2015 June 8 appear at relatively low solar latitudes (S12 and S13 r espectively).
Attached are images observed on 2015 August 17, 18, 19, 22 and 23, and magnetograms from SolarMonitor.org and SDO for reference.
Telescope: AP Starfire EDT 155 mm f/9.
stopped to 50 mm for disc images, with 4X telecentric lens (f/36) for closeups
filter: Solar Spectrum SO1.5/0.3A with CERF prefilter
Camera: Imperx 4M15
North is up, and east to the left.
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發表於 2017-3-29 22:22:29