NLC 2009-07-25/26
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. For some, there may also be an unsharp-masked version of the image.
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).
