
NLC 2009-07-12/13
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: 2009-07-12/13 UT forms bright height azimuth comments ness top bot left rght e.g. weather ----- ----- ------ ------- ---- ---- -------------------------------- 21:30 X patchy cirrus 21:45 X cirrus 22:00 I,III 2 40 cloud below and on right 22:15 NLC 3 through cloud gap 22:30 II 3 cloud above 22:45 II 3 cloud above 23:00 NLC 3 through cloud 23:15 NLC 4 through cloud 23:30 NLC 4 through cloud 23:45 NLC 4 cloud above 00:00 NLC 4 cloud above 00:15 NLC 4 cloud above 00:30 NLC 4 cloud above 00:45 NLC 4 cloud above 01:00 NLC 4 through cloud 01:15 NLC 4 through cloud 01:30 NLC 4 through cloud 01:45 NLC 3 through cloud 02:00 X cloud 02:15 X cloud 02:30 X cloud 02:45 X cloud 03:00 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: 2009/07/12-13 Start: 22:00 End: 01:45 Forms: I,II,III Max elevation: 40 Max brightness: 4 Comments: <a href="http://www.chiandh.me.uk/p/NLC_2009-07-12/13>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 ----- ------ ----- ----- ----- ----- ----- ------------ 22:00 0.600 327.9 -6.9 0.9 162.8 0-255 q06490.jpg 22:15 1.300 331.3 -7.9 -0.3 147.6 0-255 q06493.jpg 22:30 2.000 334.6 -8.9 -1.1 102.0 0-255 q06497.jpg 22:45 4.000 338.1 -9.7 -1.7 45.7 0-255 q06504.jpg 23:00 8.000 341.5 -10.5 -2.2 26.1 0-255 q06513.jpg 23:15 8.000 345.0 -11.1 -2.6 18.5 0-255 q06525.jpg 23:30 8.000 348.5 -11.6 -2.9 14.7 0-255 q06540.jpg 23:45 15.000 352.1 -11.9 -3.1 12.6 0-255 q06554.jpg 00:00 15.000 355.6 -12.1 -3.3 11.5 0-255 q06569.jpg 00:15 15.000 359.2 -12.2 -3.3 11.1 0-255 q06584.jpg 00:30 15.000 2.7 -12.2 -3.3 11.2 0-255 q06599.jpg 00:45 8.000 6.3 -12.0 -3.2 12.0 0-255 q06615.jpg 01:00 8.000 9.8 -11.7 -3.0 13.6 0-255 q06630.jpg 01:15 8.000 13.4 -11.3 -2.8 16.4 0-255 q06645.jpg 01:30 8.000 16.9 -10.8 -2.4 21.7 0-255 q06657.jpg 01:45 10.000 20.3 -10.1 -2.0 33.6 0-255 q06667.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).