NLC 2010-05-25/26
BAA report
The report to the BAA Aurora Section gives an overview of the night, which times were cloudy, free of NLC, or with sightings of NLC.
Name of observer: Horst Meyerdierks
Location: Stichill Eastfield, 55.7N 2.4W
unattended dSLR with limited field of view A ~310-20, h ~0-40
images every 15 min
Date: 2010-05-25/26
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 0 clear
21:30 0 thin cirrus to h 4
21:45 0 thin cirrus to h 4
22:00 0 thin cirrus to h 10
22:15 0 thin cirrus to h 10, cumulus on left
22:30 X cloud patches left and top
22:45 X cloud patches, except bottom right
23:00 X cloud patches, except bottom right
23:15 X cloud patches, except bottom right
23:30 X cloud patches, fake NLC at h 30, moonlit?
23:45 X cloud patches all over
00:00 X almost overcast
00:15 X almost overcast
00:30 X almost overcast
00:45 X almost overcast
01:00 X almost overcast
01:15 X overcast
01:30 X overcast
01:45 X overcast
02:00 X overcast
02:15 X overcast
02:30 X overcast
02:45 X almost overcast
03:00 X almost overcast
forms: I: veil
II: bands
III: waves
IV: whirls
NLC: other than or multiple of I-IV
0: no NLC
X: no decision possible (mist, cloud etc.)
brightness: 1: very weak
2: clearly detected
3: clearly visible
4: very bright
5: extremely bright
NLCnet report
The main periods of absence of NLC are reported to the NLC Observers' Home Page:
Name: Horst Meyerdierks Country: Scotland Location: Stichill Date: 2010/05/25-26 Start: 21:15 End: 22:15 Comments:
Images
Listed below are the images with sightings of fake NLC. These have been processed merely to adjust the brightness for underexposure. For some there may also be an unsharp-masked version of the image.
UT exp A hSun h15 h85 stretch image (masked) ----- ------ ----- ----- ----- ----- ----- ------------------------- 23:30 30.000 351.2 -12.9 -3.7 8.7 0-255 q28523.jpg exp: Exposure time in seconds (400 ISO, f/3.5). A: Azimuth of the Sun (degrees). hSun: Altitude of the Sun (degrees, negative below horizon). h15: Max. altitude of sunlight at 15 km height (degrees). h85: Max. altitude of sunlight at 85 km height (degrees). stretch: Contrast stretch (0-255 means no stretch).
