NLC 2009-07-20/21
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: 2009-07-20/21
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ ------- ---- ---- --------------------------------
21:15 X cloud to h 15 and top left
21:30 X cloud
21:45 X cloud
22:00 X patchy cloud, probably no NLC
22:15 X patchy cloud, probably no NLC
22:30 0 cloud to h 5
22:45 0 cloud to h 5
23:00 0 cloud to h 5
23:15 0 cloud to h 5, and above h 20
23:30 0 cloud to h 5, some patches above
23:45 X cloud, probably no NLC
00:00 X cloud
00:15 X cloud
00:30 NLC? 1 5 350 10 patchy cloud
00:45 NLC 1 5 350 10 patchy cloud
01:00 NLC 1 5 350 10 patchy cloud
01:15 X cloud above h 5
01:30 X cloud above h 5
01:45 X cloud
02:00 X cloud
02:15 X cloud
02:30 X cloud
02:45 X cloud to h 20
03:00 X cloud to h 15
03:15 X cloud to h 10
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: 2009/07/20-21
Start: 00:30
End: 01:00
Forms: NLC
Max elevation: 5
Max brightness: 1
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-20/21>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) ----- ------ ----- ----- ----- ----- ----- ------------------------- 00:30 25.000 2.6 -13.6 -4.1 6.8 0-255 q08433.jpg m08433.jpg 00:45 25.000 6.2 -13.4 -4.0 7.2 0-255 q08448.jpg m08448.jpg 01:00 25.000 9.8 -13.1 -3.9 8.0 0-255 q08463.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).
