AR2797 | HA, CaK, WL | Jan 21 2021

[MalVeauX]

Heya,

It was a cloudy morning, but it cleared up later towards 11am or so. We went outside to see our star visually and then grabbed a little data in three wavelengths to show the differences of the upper & lower chromosphere structures around AR2797 with the spot, plage, mottling, chromosphere network, filaments, k-grains and faculae. And a comparison of the photosphere to see the spot, convection cells, pores and faculae. Looks like we saw a little minor flaring in the plage near the trailing pole of AR2797.

Seeing Conditions:

Seeing was poor, averaging 2" per minute, however I was seeing spikes of seeing closer to 1" and 1.3" as a range fairly frequently and had a minute of sustained 1" average. Peak moments highlighted on the graph. These were the moments I was able to grab useful data in the three wavelengths over this short period of 15 minutes or so. I used lucky imaging, 170FPS in bursts of 60 seconds during those moments of good seeing to produce the images.

Equipment:

100mm F10 (3D printed mask) refractor with internal sub-aperture D-ERF (Baader Red CCD IR Block Filter, 2")
PST Etalon + 10mm BF (HA)
Lunt CaK B1200 (CaK)
Baader ND3.0 + 610nm (WL)
ASI290MM Camera

Very best,

[Pete Presland]

A fine set of images, some nice action there.