NLC 2010-05-30/31
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: 2010-05-30/31
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 0 clear, cirrus on bottom left
21:30 0 clear, some cirrus
21:45 0 clear, some cirrus
22:00 0 clear, cirrus on top right, fake NLC
22:15 0 clear, tiny cloud patches
22:30 0 cloud to h 5, fake NLC on left
22:45 0 cloud to h 7, fake NLC to h 35
23:00 0 cloud to h 10, fake NLC to h 30
23:15 0 cloud to h 10, fake NLC h 25-30
23:30 X cloud to h 18
23:45 X cloud to h 10
00:00 0 clear, cloud to h 4
00:15 0 clear, cloud to h 4
00:30 0 clear
00:45 0 clear
01:00 0 clear, cloud to h 8
01:15 0 clear, cloud to h 10
01:30 0 clear, thin cirrus to h 10
01:45 0 clear, thin cirrus to h 15
02:00 0 clear, cloud patch near centre
02:15 0 clear, cloud patch on right
02:30 0 clear
02:45 0 clear
03:00 0 clear, few cloud patches
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: 2010/05/30-31 Start: 21:15 End: 03:00 Comments: NLC sector obscured by cloud 23:30 to 23:45.
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) ----- ------ ----- ----- ----- ----- ----- ------------------------- 22:00 0.800 330.4 -7.9 -0.3 148.4 0-255 q28920.jpg 22:30 4.000 337.2 -9.8 -1.8 44.3 0-255 q28924.jpg 22:45 6.000 340.6 -10.5 -2.3 25.0 0-255 q28928.jpg 23:00 10.000 344.1 -11.2 -2.7 17.6 0-255 q28932.jpg 23:15 15.000 347.6 -11.7 -3.0 13.9 0-255 q28937.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).
