NLC 2009-07-25/26
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: 2009-07-25/26
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 0 cloud to h 10
21:30 0 cloud to h 5
21:45 0 some cloud on horizon
22:00 0 contrail
22:15 NLC? among cirrus
22:30 NLC 1 10 <325 5 among cirrus
22:45 NLC 2 10 among cirrus
23:00 X cirrus
23:15 X cirrus
23:30 X cirrus
23:45 X cirrus
00:00 X thin cloud
00:15 X thin cloud
00:30 X thin cloud
00:45 X thin cloud
01:00 X thin cloud
01:15 X thin cloud
01:30 NLC 2 10 amongst cirrus
01:45 NLC 3 10 behind cloud
02:00 X cloud h 5 to 10
02:15 X cloud h 5 to 10
02:30 X cloud h 5 to 10
02:45 I 3 15 cloud h 5 to 10 and on left
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: 2009/07/25-26
Start: 22:15
End: 02:45
Forms: NLC
Max elevation: 15
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-25/26>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) ----- ------ ----- ----- ----- ----- ----- ------------------------- 22:15 10.000 330.4 -10.2 -2.0 32.3 0-255 q09634.jpg m09634.jpg 22:30 20.000 333.8 -11.2 -2.7 17.8 0-255 q09645.jpg m09645.jpg 22:45 25.000 337.3 -12.0 -3.2 12.1 0-255 q09659.jpg 01:30 25.000 17.1 -13.2 -3.9 7.8 0-200 q09824.jpg 01:45 25.000 20.7 -12.5 -3.5 10.1 0-255 q09839.jpg 02:45 2.500 34.5 -8.6 -0.9 121.8 0-255 q09886.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).
