
NLC 2009-07-10/11
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: 2009-07-10/11 UT forms bright height azimuth comments ness top bot left rght e.g. weather ----- ----- ------ ------- ---- ---- -------------------------------- 21:30 X cloud 21:45 X cloud 22:00 X cloud 22:15 X cloud to h 15 or 20 22:30 X patchy cloud 22:45 X cloud to h 15 or 20 23:00 X cloud 23:15 X cloud 23:30 X cloud 23:45 NLC 3 through cloud gap 00:00 X cloud 00:15 NLC 1 through cloud gap 00:30 NLC 2 through cloud gap 00:45 NLC 2 through cloud gap 01:00 II 2 amongst cirrus 01:15 I 3 10 5 0 15 some cirrus 01:30 II 1 10 5 0 5 cloud to h 5 01:45 0 cloud to h 5 02:00 0 cloud to h 10 02:15 0 cloud to h 10 02:30 0 cloud to h 10 02:45 0 cloud to h 10 03:00 0 cloud to h 10 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: 2009/07/10-11 Start: 23:45 End: 01:30 Forms: I,II Max elevation: 10 Max brightness: 3 Comments: <a href="http://www.chiandh.me.uk/p/NLC_2009-07-10/11>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 ----- ------ ----- ----- ----- ----- ----- ------------ 23:45 15.000 352.1 -11.6 -3.0 14.2 0-255 q06142.jpg 00:15 15.000 359.2 -12.0 -3.2 12.4 0-255 q06172.jpg 00:30 15.000 2.8 -11.9 -3.2 12.6 0-255 q06187.jpg 00:45 15.000 6.3 -11.8 -3.1 13.5 0-255 q06202.jpg 01:00 15.000 9.9 -11.5 -2.9 15.4 0-255 q06217.jpg 01:15 8.000 13.4 -11.0 -2.6 18.8 0-200 q06232.jpg 01:30 8.000 16.9 -10.5 -2.2 25.7 0-255 q06244.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).