
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).