NLC 2009-07-24/25
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: 2009-07-24/25
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 X cloud
21:30 X cloud
21:45 X cloud
22:00 X cloud
22:15 X cloud
22:30 X cloud
22:45 X cloud
23:00 X cloud
23:15 X 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 NLC? through small cloud gap
01:15 X cloud
01:30 NLC? through cloud gap
01:45 NLC? through cloud gaps
02:00 NLC? through cloud gaps
02:15 I,III 4 5 cloud in front
02:30 NLC 3 5 cloud on right
02:45 NLC 2 5 cloud on right
03:00 0 low cloud on right
03:15 0 low cloud on right
03:30 0 low cloud on right
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: 2009/07/24-25
Start: 01:00
End: 02:45
Forms: I,III
Max elevation: 5
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-24/25>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 ----- ------ ----- ----- ----- ----- ----- ------------ 01:00 25.000 9.9 -13.9 -4.3 5.9 0-150 q09515.jpg 01:30 25.000 17.1 -13.0 -3.8 8.5 0-200 q09545.jpg 01:45 25.000 20.6 -12.3 -3.4 10.9 0-255 q09560.jpg 02:00 25.000 24.1 -11.5 -2.9 15.3 0-255 q09575.jpg 02:15 8.000 27.6 -10.6 -2.3 24.6 0-255 q09590.jpg 02:30 4.000 31.0 -9.5 -1.6 55.6 0-255 q09600.jpg 02:45 2.500 34.4 -8.4 -0.7 132.3 0-255 q09606.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).
