NLC 2009-07-04/05
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: 2009-07-04/05
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ ------- ---- ---- --------------------------------
21:45 X cloud to h 25
22:00 X cloud to h 25
22:15 X cloud to h 20
22:30 X cloud
22:45 X cloud
23:00 I 1 15 cloud to h 15
23:15 X patchy cloud
23:30 X cloud to h 25
23:45 I,II 2 15 <325 >10 cloud on right to h 15
00:00 I,II 2 15 0 <325 >10 cloud on right to h 10
00:15 II,IV 3 15 0 <325 25 cloud on right to h 5
00:30 II,IV 3 15 0 <325 >30 clear
00:45 II,IV 3 15 0 <325 >35 clear
01:00 II,IV 3 15 0 <325 >10 clear
01:15 II,IV 3 20 0 <325 >15 cloud on right to h 10
01:30 IV 3 25 5 <325 >20 cloud on right to h 15
01:45 III 3 25 10 <325 20 clear
02:00 III 3 25 15 <325 15 almost clear
02:15 III,IV 2 30 10 <325 15 almost clear
02:30 NLC? 1 almost clear
02:45 0 almost clear
03:00 X cirrus
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: 2009/07/04-05
Start: 23:00
End: 02:30
Forms: II,III,IV
Max elevation: 30
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-04/05>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 ----- ------ ----- ----- ----- ----- ----- ------------ 23:00 6.000 342.0 -9.6 -1.6 53.0 0-255 q05008.jpg 23:45 8.000 352.4 -11.0 -2.6 19.4 0-200 q05040.jpg 00:00 8.000 355.9 -11.2 -2.7 17.4 0-200 q05053.jpg 00:15 15.000 359.5 -11.3 -2.8 16.7 0-255 q05067.jpg 00:30 8.000 3.0 -11.2 -2.7 17.1 0-200 q05083.jpg 00:45 8.000 6.5 -11.1 -2.6 18.6 0-200 q05096.jpg 01:00 8.000 10.0 -10.8 -2.4 21.8 0-255 q05108.jpg 01:15 4.000 13.5 -10.3 -2.1 28.5 0-200 q05120.jpg 01:30 4.000 17.0 -9.8 -1.8 43.8 0-255 q05129.jpg 01:45 2.000 20.4 -9.1 -1.3 84.7 0-255 q05137.jpg 02:00 2.000 23.8 -8.3 -0.6 135.6 0-255 q05141.jpg 02:15 1.000 27.2 -7.4 0.2 157.0 0-255 q05144.jpg 02:30 0.400 30.5 -6.4 1.5 166.1 0-255 q05147.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).
