
NLC 2011-07-14/15
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: 2011-07-14/15 UT forms bright height azimuth comments ness top bot left rght e.g. weather ----- ----- ------ --- --- ---- ---- -------------------------------- 21:30 0 cloud to h 15 21:45 X 22:00 X 22:15 NLC? 1 through cloud 22:30 X 22:45 X 23:00 X 23:15 NLC? 1 through cloud 23:30 X 23:45 X 00:00 II 1 through cloud 00:15 NLC 1 through cloud 00:30 X 00:45 NLC 1 through cloud 01:00 NLC 2 through cloud 01:15 NLC 2 through cloud 01:30 X 01:45 X 02:00 X 02:15 X 02:30 X 02:45 X 03:00 X 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: 2011/07/14-15 Start: 00:00 End: 01:15 Forms: NLC Max elevation: Max brightness: 2 Comments: Through cloud. <a href="http://www.chiandh.me.uk/p/NLC_2011-07-14/15">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) ----- ------ ----- ----- ----- ----- ----- --------------------- 22:15 0.500 331.2 -8.1 -0.5 142.0 0-255 q15769.jpg m15769.jpg 23:15 3.200 344.9 -11.3 -2.8 16.6 0-255 q15782.jpg m15782.jpg 00:00 8.000 355.6 -12.4 -3.4 10.6 0-255 q15799.jpg m15799.jpg 00:15 8.000 359.1 -12.5 -3.5 10.2 0-255 q15805.jpg m15805.jpg 00:45 4.000 6.3 -12.3 -3.4 11.0 0-255 q15816.jpg m15816.jpg 01:00 2.500 9.8 -12.0 -3.2 12.3 0-255 q15821.jpg m15821.jpg 01:15 2.000 13.4 -11.6 -2.9 14.7 0-255 q15826.jpg m15826.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).