NLC 2009-07-14/15
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: 2009-07-14/15
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ ------- ---- ---- --------------------------------
21:30 X cloud
21:45 X cloud
22:00 X cloud
22:15 X cloud
22:30 NLC 3 30 behind cloud
22:45 NLC 4 behind cloud
23:00 NLC 4 behind cloud
23:15 NLC 4 behind 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 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
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: 2009/07/14-15
Start: 22:30
End: 23:15
Forms: O
Max elevation: 30
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-14/15>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 ----- ------ ----- ----- ----- ----- ----- ------------ 22:30 4.000 334.5 -9.2 -1.3 80.0 0-255 q06925.jpg 22:45 4.000 337.9 -10.0 -1.9 35.9 0-255 q06934.jpg 23:00 4.000 341.4 -10.8 -2.4 22.0 0-255 q06945.jpg 23:15 15.000 344.9 -11.4 -2.8 16.1 0-255 q06957.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).
