NLC 2009-07-24/25
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: Royal Observatory Edinburgh, 55.9N 3.2W
unattended dSLR with limited field of view A ~325-35, h ~0-40
images every 5 min
Date: 2009-07-24/25
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 X cloud
21:30 X cloud
21:45 X cloud
22:00 X cloud
22:15 X cloud
22:30 X cloud
22:45 X cloud
23:00 X cloud
23:15 X cloud
23:30 X cloud
23:45 X cloud
00:00 X cloud
00:15 X cloud
00:30 X cloud
00:45 X cloud
01:00 NLC? through small cloud gap
01:15 X cloud
01:30 NLC? through cloud gap
01:45 NLC? through cloud gaps
02:00 NLC? through cloud gaps
02:15 I,III 4 5 cloud in front
02:30 NLC 3 5 cloud on right
02:45 NLC 2 5 cloud on right
03:00 0 low cloud on right
03:15 0 low cloud on right
03:30 0 low cloud on right
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: Edinburgh
Date: 2009/07/24-25
Start: 01:00
End: 02:45
Forms: I,III
Max elevation: 5
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-24/25>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 ----- ------ ----- ----- ----- ----- ----- ------------ 01:00 25.000 9.9 -13.9 -4.3 5.9 0-150 q09515.jpg 01:30 25.000 17.1 -13.0 -3.8 8.5 0-200 q09545.jpg 01:45 25.000 20.6 -12.3 -3.4 10.9 0-255 q09560.jpg 02:00 25.000 24.1 -11.5 -2.9 15.3 0-255 q09575.jpg 02:15 8.000 27.6 -10.6 -2.3 24.6 0-255 q09590.jpg 02:30 4.000 31.0 -9.5 -1.6 55.6 0-255 q09600.jpg 02:45 2.500 34.4 -8.4 -0.7 132.3 0-255 q09606.jpg exp: Exposure time in seconds (200 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).
