NLC 2010-06-25/26
From chi and h
Contents |
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: 2010-06-25/26
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:45 X patchy cloud
22:00 X patchy cloud
22:15 X patchy cloud
22:30 X almost overcast
22:45 X almost overcast
23:00 X overcast
23:15 X almost overcast
23:30 X almost overcast
23:45 X almost overcast
00:00 X almost overcast
00:15 X almost overcast
00:30 NLC 4 12 345 >15 cloud to h 9, patches higher up
00:45 NLC 4 through cloud
01:00 II,III 4 15 340 >20 through cloud
01:15 X cloud, lightbox
01:30 NLC through cloud
01:45 X cloud
02:00 X cloud
02:15 X cloud to h 10 or 20
02:30 X cloud to h 10 or 20
02:45 X cloud
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 periods of positive sightings of NLC are reported to the NLC Observers' Home Page:
Name: Horst Meyerdierks
Country: Scotland
Location: Stichill
Date: 2010/06/25-26
Start: 00:30
End: 01:30
Forms: II,III
Max elevation: 15
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-06-25/26">Images</a>.
forms: I: veil
II: bands
III: waves
IV: whirls
O: other than or multiple of I-IV
brightness: 1: very weak
2: clearly detected
3: clearly visible
4: very bright
5: extremely bright
Images
Listed below are the images with positive sightings of 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) ----- ------ ----- ----- ----- ----- ----- ------------------------- 00:30 10.000 4.1 -10.9 -2.5 20.4 0-255 q30352.jpg 00:45 8.000 7.6 -10.7 -2.4 23.0 0-255 q30356.jpg 01:00 6.000 11.1 -10.3 -2.1 28.5 0-255 q30360.jpg 01:30 2.500 18.0 -9.3 -1.4 72.5 0-255 q30365.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).
