
NLC 2012-06-28/29
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: 2012-06-28/29 UT forms bright height azimuth comments ness top bot left rght e.g. weather ----- ----- ------ --- --- ---- ---- -------------------------------- 21:45 X widespread cloud 22:00 X widespread cloud 22:15 0 some cloud patches 22:30 0 22:45 II 1 10 8 20 30 23:00 I 1 18 <325 5 23:15 I 1 20 5 <325 30 23:30 I 2 17 <325 30 cloud to h 10 23:45 I 2 17 <325 cloud to h 10 or 15 00:00 I 3 14 <325 >35 cloud to h 10 00:15 I 3 12 through cloud 00:30 I 3 15 >35 through cloud 00:45 I 3 through cloud 01:00 NLC 3 through cloud 01:15 NLC 2 through cloud 01:30 X widespread cloud 01:45 I,IV 2 through cloud 02:00 IV 1 through cloud 02:15 X widespread cloud 02:30 X widespread cloud 02:45 X widespread 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: 2012/06/28-29 Start: 22:45 End: 02:00 Forms: I,II,IV Max elevation: 20 Max brightness: 3 Comments: <a href="http://www.chiandh.me.uk/p/NLC_2012-06-28/29">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) ----- ------ ----- ----- ----- ----- ----- --------------------- 22:45 0.600 338.9 -8.5 -0.8 126.8 0-255 q00322.jpg m00322.jpg 23:00 1.000 342.3 -9.2 -1.3 76.9 0-255 q00324.jpg m00324.jpg 23:15 2.000 345.8 -9.8 -1.8 43.6 0-255 q00327.jpg m00327.jpg 23:30 2.500 349.2 -10.3 -2.1 30.3 0-255 q00330.jpg 23:45 3.200 352.7 -10.6 -2.3 24.4 0-255 q00334.jpg 00:00 4.000 356.2 -10.8 -2.4 21.6 0-255 q00338.jpg 00:15 4.000 359.7 -10.9 -2.5 20.7 0-255 q00342.jpg 00:30 4.000 3.2 -10.8 -2.5 21.3 0-255 q00346.jpg 00:45 4.000 6.7 -10.6 -2.3 23.7 0-255 q00350.jpg 01:00 3.200 10.2 -10.3 -2.1 28.9 0-255 q00354.jpg 01:15 2.000 13.7 -9.9 -1.8 40.4 0-255 q00357.jpg 01:45 0.600 20.6 -8.6 -0.9 119.6 0-255 q00361.jpg 02:00 0.400 23.9 -7.9 -0.2 149.7 0-255 q00363.jpg m00363.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).