NLC 2009-07-30/31
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. For some, there may also be an unsharp-masked version of the image.
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).
