NLC 2009-07-02/03
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: 2009-07-02/03
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ ------- ---- ---- --------------------------------
21:45 X cirrus
22:00 X cirrus
22:15 X cirrus
22:30 X cirrus
22:45 X cirrus
23:00 X cirrus
23:15 III? 1 25 15 340 5 cirrus below and both sides
23:30 X cirrus to h 15
23:45 X cirrus to h 10
00:00 X cirrus to h 10
00:15 II 2 15 amongst cirrus
00:30 IV 2 15 <325 355 amongst cirrus
00:45 IV 2 15 <325 0 also cirrus
01:00 IV 2 15 <325 0 also cirrus
01:15 II 3 20 <325 350 also cirrus
01:30 IV 3 25 <325 10 also cirrus
01:45 IV 2 25 <325 25 cirrus below
02:00 IV 1 30 <325 25 cirrus below
02:15 0 cirrus to h 10
02:30 0 cirrus to h 10
02:45 0 cirrus to h 10
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: 2009/07/02-03
Start: 00:15
End: 02:00
Forms: II,IV
Max elevation: 30
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-02/03>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) ----- ------ ----- ----- ----- ----- ----- ------------------------- 23:15 8.000 345.5 -10.0 -1.9 36.1 0-255 q04703.jpg m04703.jpg 00:15 20.000 359.5 -11.1 -2.6 18.2 0-255 q04748.jpg 00:30 20.000 3.1 -11.1 -2.6 18.6 0-255 q04760.jpg 00:45 15.000 6.6 -10.9 -2.5 20.4 0-255 q04772.jpg 01:00 15.000 10.1 -10.6 -2.3 24.3 0-255 q04784.jpg 01:15 10.000 13.6 -10.2 -2.0 32.4 0-255 q04795.jpg 01:30 6.000 17.0 -9.6 -1.6 52.2 0-255 q04804.jpg 01:45 3.200 20.4 -8.9 -1.1 99.6 0-255 q04811.jpg 02:00 2.000 23.8 -8.1 -0.5 142.3 0-255 q04815.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).
