NLC 2009-07-22/23
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: 2009-07-22/23
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 0 cloud to h 10
21:30 X cloud to h 15
21:45 0 cloud patches
22:00 NLC? 1 5 5 20 cloud patches
22:15 NLC 2 5 patchy cloud
22:30 NLC 2 cloud in front and above
22:45 NLC cloud in front and above
23:00 NLC through narrow clear strip on horizon
23:15 NLC through narrow clear strip on horizon
23:30 NLC through narrow clear strip on horizon
23:45 X cloud
00:00 X cloud
00:15 X cloud
00:30 X cloud
00:45 X cloud
01:00 X cloud
01:15 X cloud
01:30 X cloud
01:45 X cloud
02:00 X cloud
02:15 X cloud
02:30 X cloud
02:45 X cloud
03:00 X cloud
03:15 X cloud
03:30 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: Edinburgh
Date: 2009/07/22-23
Start: 22:00
End: 23:30
Forms: NLC
Max elevation: 5
Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-22/23>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) ----- ------ ----- ----- ----- ----- ----- --------------------- 22:00 2.500 327.2 -8.5 -0.8 129.2 0-255 q08821.jpg m08821.jpg 22:15 6.000 330.6 -9.6 -1.6 54.4 0-255 q08826.jpg 22:30 13.000 334.0 -10.5 -2.3 25.0 0-255 q08835.jpg 22:45 15.000 337.5 -11.4 -2.8 15.8 0-255 q08848.jpg 23:00 15.000 341.0 -12.2 -3.3 11.5 0-255 q08863.jpg 23:15 15.000 344.6 -12.8 -3.7 9.1 0-255 q08878.jpg 23:30 15.000 348.1 -13.3 -4.0 7.5 0-255 q08893.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).
