Try increasing gamma if dark sections aren't distinguished

Try increasing gamma if dark sections aren't distinguished

Sunday, April 21, 2019

sunspot AR 2738 and a few proms

Despite being at solar minimum, a moderately large sunspot was well positioned mid April:
AR 2738 4/14/19 WL

AR 2738 4/14/19 Ha
AR 2738 4/14/19 Ha and WL

The following weekend as the spot rotated off the face to the edge, i watched very dynamic activity on the limb, including a prominence lifting off and a very bright ball of plasma:
Ha 4/20/19
...which i just missed with the camera :(

but there was a nice prominence on the opposite side:
Ha 4/20/19

Full disk view through light incoming clouds:
Sun Ha 4/20/19 through light clouds causing glare





Image details:
C11 edge on ASA DDM 80, baader film, baader continuum filter, IR/UV block filter
first light with C11 soloar filter, love the cooling fans, unfortunately seeing was poor
Lunt 60 PT on manual alt-azm mount
Eastbluff, CA

4/14/19 poor seeing (image reduced to 50%)
C11
19:45 UTC
ASI 290 MM
FPS (avg.)=147
Shutter=0.918ms
Gain=351 (58%)

Lunt double stacked
20:56 UTC
ASI 290 MM
FPS (avg.)=103
Shutter=9.699ms
Gain=67 (11%)

4/20/19
first prom
ASI 290 MM
22:55 UTC
second 22:58 UTC
20 second video
111 fps
Shutter=1.0 ms
gain 351
best 12%

full disk with light clouds
ASI 174 MM
23:09 UTC
45 fps
Shutter=10.00ms
Gain=225 (56%)


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