NLC 2009-07-22/23
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: 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.
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).
