NLC 2009-07-30/31
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: 2009-07-30/31
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:00 0
21:15 0
21:30 0 aeroplane
21:45 0 some cirrus
22:00 0 some cirrus
22:15 0 some cirrus, aeroplane
22:30 II 2 5 355 15 cirrus above
22:45 II 2 5 350 20 some cirrus above
23:00 II 2 5 345 15
23:15 NLC 2 5 345 10
23:30 NLC 2 5 340 10
23:45 NLC 2 5 345 15
00:00 NLC 2 5 350 10
00:15 NLC 2 5 350 20
00:30 NLC 2 5 345 25
00:45 NLC 2 5 345 25
01:00 I,III 3 5 345 20
01:15 NLC 3 5 350 15
01:30 NLC 3 5 behind cirrus
01:45 NLC 4 5 355 >35 some cirrus in front
02:00 NLC 4 10 355 >35 cirrus above
02:15 NLC 4 10 355 >35 cirrus above, some in front
02:30 NLC 3 10 cirrus in front
02:45 NLC 3 15 cirrus in front
03:00 X cirrus
03:15 0 cirrus
03:30 0 cirrus
03:45 0 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: 2009/07/30-31
Start: 22:30
End: 02:45
Forms: I,II,III,O
Max elevation: 15
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-30/31>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 ----- ------ ----- ----- ----- ----- ----- ------------ 22:30 25.000 333.5 -12.3 -3.4 10.9 0-200 q11128.jpg 22:45 25.000 337.1 -13.2 -3.9 7.8 0-200 q11143.jpg 23:00 25.000 340.7 -13.9 -4.3 5.9 0-255 q11158.jpg 23:15 25.000 344.3 -14.6 -4.7 4.7 0-255 q11173.jpg 23:30 25.000 347.9 -15.1 -5.0 3.8 0-255 q11188.jpg 23:45 25.000 351.6 -15.4 -5.2 3.2 0-255 q11203.jpg 00:00 25.000 355.3 -15.7 -5.3 2.9 0-200 q11218.jpg 00:15 25.000 359.0 -15.8 -5.4 2.7 0-200 q11233.jpg 00:30 25.000 2.7 -15.8 -5.4 2.7 0-150 q11248.jpg 00:45 25.000 6.4 -15.6 -5.3 3.0 0-150 q11263.jpg 01:00 25.000 10.0 -15.3 -5.1 3.4 0-255 q11278.jpg 01:15 15.000 13.7 -14.9 -4.9 4.1 0-255 q11294.jpg 01:30 15.000 17.3 -14.3 -4.6 5.1 0-255 q11309.jpg 01:45 15.000 20.9 -13.6 -4.2 6.6 0-255 q11324.jpg 02:00 15.000 24.5 -12.8 -3.7 8.9 0-255 q11339.jpg 02:15 15.000 28.0 -11.9 -3.1 12.8 0-255 q11354.jpg 02:30 15.000 31.5 -10.9 -2.5 20.8 0-255 q11368.jpg 02:45 6.000 34.9 -9.7 -1.7 47.5 0-255 q11379.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).
