NLC 2009-07-12/13
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: 2009-07-12/13
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ ------- ---- ---- --------------------------------
21:30 X patchy cirrus
21:45 X cirrus
22:00 I,III 2 40 cloud below and on right
22:15 NLC 3 through cloud gap
22:30 II 3 cloud above
22:45 II 3 cloud above
23:00 NLC 3 through cloud
23:15 NLC 4 through cloud
23:30 NLC 4 through cloud
23:45 NLC 4 cloud above
00:00 NLC 4 cloud above
00:15 NLC 4 cloud above
00:30 NLC 4 cloud above
00:45 NLC 4 cloud above
01:00 NLC 4 through cloud
01:15 NLC 4 through cloud
01:30 NLC 4 through cloud
01:45 NLC 3 through cloud
02:00 X cloud
02:15 X cloud
02:30 X cloud
02:45 X cloud
03:00 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: 2009/07/12-13
Start: 22:00
End: 01:45
Forms: I,II,III
Max elevation: 40
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-12/13>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 ----- ------ ----- ----- ----- ----- ----- ------------ 22:00 0.600 327.9 -6.9 0.9 162.8 0-255 q06490.jpg 22:15 1.300 331.3 -7.9 -0.3 147.6 0-255 q06493.jpg 22:30 2.000 334.6 -8.9 -1.1 102.0 0-255 q06497.jpg 22:45 4.000 338.1 -9.7 -1.7 45.7 0-255 q06504.jpg 23:00 8.000 341.5 -10.5 -2.2 26.1 0-255 q06513.jpg 23:15 8.000 345.0 -11.1 -2.6 18.5 0-255 q06525.jpg 23:30 8.000 348.5 -11.6 -2.9 14.7 0-255 q06540.jpg 23:45 15.000 352.1 -11.9 -3.1 12.6 0-255 q06554.jpg 00:00 15.000 355.6 -12.1 -3.3 11.5 0-255 q06569.jpg 00:15 15.000 359.2 -12.2 -3.3 11.1 0-255 q06584.jpg 00:30 15.000 2.7 -12.2 -3.3 11.2 0-255 q06599.jpg 00:45 8.000 6.3 -12.0 -3.2 12.0 0-255 q06615.jpg 01:00 8.000 9.8 -11.7 -3.0 13.6 0-255 q06630.jpg 01:15 8.000 13.4 -11.3 -2.8 16.4 0-255 q06645.jpg 01:30 8.000 16.9 -10.8 -2.4 21.7 0-255 q06657.jpg 01:45 10.000 20.3 -10.1 -2.0 33.6 0-255 q06667.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).
