
NLC 2012-07-27/28
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 15 min Date: 2012-07-27/28 UT forms bright height azimuth comments ness top bot left rght e.g. weather ----- ----- ------ --- --- ---- ---- -------------------------------- 21:00 0 21:15 0 21:30 0 21:45 0 22:00 0 22:15 0 cloud on right 22:30 0 cloud on right to h 5 22:45 0 23:00 0 23:15 NLC? through cloud 23:30 NLC? through cloud 23:45 NLC? through cloud 00:00 NLC 1 through cloud 00:15 X cloud to h 5 00:30 I 2 through cloud 00:45 X cloud to h 5 or 10 01:00 NLC? through cloud 01:15 NLC 2 through cloud 01:30 NLC through cloud 01:45 NLC through cloud 02:00 X cloud to h 10 or 20 02:15 X cloud to h 10 or 20 02:30 X cloud to h 20 or 25 02:45 X widespread cloud 03:00 X cloud to h 15 or 25 03:15 X cloud to h 20 03:30 X cloud to h 20 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: 2012/07/27-28 Start: 23:15 End: 01:45 Forms: O Max elevation: 5 Max brightness: 2 Comments: <a href="http://www.chiandh.me.uk/p/NLC_2012-07-27/28">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 (masked) ----- ------ ----- ----- ----- ----- ----- --------------------- 23:15 15.000 344.4 -13.9 -4.3 6.0 0-255 q02742.jpg m02742.jpg 23:30 15.000 348.0 -14.4 -4.6 4.9 0-255 q02748.jpg m02748.jpg 23:45 15.000 351.6 -14.8 -4.8 4.3 0-255 q02754.jpg m02754.jpg 00:00 15.000 355.3 -15.0 -5.0 3.9 0-255 q02760.jpg m02760.jpg 00:30 15.000 2.6 -15.1 -5.0 3.7 0-255 q02772.jpg 01:00 15.000 10.0 -14.7 -4.7 4.5 0-255 q02784.jpg m02784.jpg 01:15 8.000 13.6 -14.2 -4.5 5.3 0-255 q02789.jpg 01:30 15.000 17.2 -13.7 -4.2 6.5 0-255 q02796.jpg 01:45 15.000 20.8 -13.0 -3.8 8.3 0-255 q02802.jpg exp: Exposure time in seconds (400 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).