
NLC 2012-06-25/26
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: 2012-06-25/26 UT forms bright height azimuth comments ness top bot left rght e.g. weather ----- ----- ------ --- --- ---- ---- -------------------------------- 21:45 0 cloud to h 5 or 10 22:00 0 cloud to h 10 or 15 22:15 X cloud to h 20 22:30 X widespread cloud 22:45 X overcast 23:00 X overcast 23:15 X overcast 23:30 X almost overcast 23:45 X widespread cloud 00:00 X patchy cloud 00:15 X cloud to h 10 00:30 II 2 15 350 >35 cloud to h 5 00:45 II 2 15 330 >35 cloud to h 5 01:00 II 2 18 325 >35 cloud to h 5 01:15 I,II 2 20 <325 >35 cloud to h 5 01:30 I 1 20 345 35 01:45 I 1 23 345 30 cirrus to h 10 02:00 0 cirrus to h 10 02:15 0 cirrus to h 10 02:30 X some 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: 2012/06/25-26 Start: 00:30 End: 01:45 Forms: I,II Max elevation: 23 Max brightness: 2 Comments: <a href="http://www.chiandh.me.uk/p/NLC_2012-06-25/26">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) ----- ------ ----- ----- ----- ----- ----- --------------------- 00:30 4.000 3.4 -10.7 -2.4 23.1 0-255 q00178.jpg 00:45 3.200 6.9 -10.5 -2.2 25.9 0-255 q00182.jpg 01:00 2.500 10.3 -10.2 -2.0 32.2 0-255 q00185.jpg 01:15 1.300 13.8 -9.7 -1.7 46.3 0-255 q00188.jpg m00188.jpg 01:30 1.000 17.3 -9.2 -1.3 80.8 0-255 q00190.jpg m00190.jpg 01:45 0.600 20.7 -8.5 -0.8 128.6 0-255 q00192.jpg m00192.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).