NLC 2009-07-21/22
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: 2009-07-21/22
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 X cloud to h 15 and top right
21:30 IV 2 25 330 20 cloud to h 5
21:45 IV 3 35 <325 >35 cloud to h 5
22:00 III,IV 4 >40 <325 >35 cloud to h 5
22:15 II,III 5 35 <325 >35 cloud on horizon
22:30 II,III 5 20 <325 25 cloud on horizon
22:45 III 5 cloud above and below
23:00 III 5 10 0 330 30 cloud below and in front
23:15 III 5 10 0 30 cloud below and in front
23:30 III 5 10 0 30 cloud on left below and in front
23:45 III 4 10 0 cloud on left below and in front
00:00 III 4 10 0 cloud on left, aeroplane trail
00:15 III 3 10 0 35 some cloud
00:30 III 3 10 0 <325 >35 some cloud
00:45 III 3 10 0 cloud above and some in front
01:00 NLC 3 10 behind cloud
01:15 NLC 3 behind cloud
01:30 III 3 10 behind cloud
01:45 I 4 behind cloud
02:00 I 4 15 behind cloud
02:15 II,III 4 20 cloud on left and below
02:30 NLC 3 through cloud gap
02:45 NLC? 1 through cloud gap
03:00 X cloud
03:15 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: 2009/07/21-22
Start: 21:30
End: 02:45
Forms: I,II,III,IV
Max elevation: >40
Max brightness: 5
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-21/22>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) ----- ------ ----- ----- ----- ----- ----- ------------------------- 21:30 0.250 320.6 -5.8 2.7 169.1 0-255 q08556.jpg 21:45 0.800 323.9 -7.1 0.6 160.8 0-255 q08559.jpg 22:00 2.000 327.3 -8.3 -0.6 137.2 0-255 q08562.jpg 22:15 2.000 330.6 -9.4 -1.5 65.9 0-200 q08567.jpg 22:30 4.000 334.1 -10.3 -2.1 28.3 0-255 q08575.jpg 22:45 4.000 337.5 -11.2 -2.7 17.3 0-255 q08588.jpg 23:00 8.000 341.1 -12.0 -3.2 12.4 0-255 q08602.jpg 23:15 8.000 344.6 -12.6 -3.5 9.7 0-255 q08617.jpg 23:30 8.000 348.2 -13.1 -3.8 8.1 0-255 q08632.jpg 23:45 8.000 351.8 -13.4 -4.1 7.1 0-255 q08647.jpg 00:00 15.000 355.4 -13.7 -4.2 6.5 0-255 q08661.jpg 00:15 15.000 359.0 -13.8 -4.3 6.3 0-255 q08676.jpg 00:30 25.000 2.6 -13.8 -4.2 6.3 0-255 q08690.jpg 00:45 25.000 6.2 -13.6 -4.1 6.7 0-255 q08705.jpg 01:00 25.000 9.8 -13.3 -4.0 7.4 0-255 q08720.jpg 01:15 15.000 13.4 -12.9 -3.7 8.7 0-255 q08736.jpg 01:30 15.000 17.0 -12.3 -3.4 10.7 0-255 q08751.jpg 01:45 15.000 20.5 -11.7 -3.0 14.1 0-255 q08766.jpg 02:00 15.000 24.0 -10.9 -2.5 20.6 0-255 q08779.jpg 02:15 8.000 27.5 -10.0 -1.9 37.8 0-255 q08790.jpg 02:30 3.200 30.9 -8.9 -1.1 98.8 0-255 q08798.jpg 02:45 1.300 34.2 -7.8 -0.2 150.5 0-255 q08802.jpg m08802.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).
