
NLC 2014-07-10/11
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 compact camera with limited field of view A ~325-35, h ~0-40; images every 15 min Date: 2014-07-10/11 UT forms bright height azimuth comments ness top bot left rght e.g. weather -------- ----- ------ --- --- ---- ---- -------------------------------- 21:30:01 X almost overcast 21:45:05 X widespread patchy cloud 22:00:02 0 cloud to h 10 22:15:02 0 cloud to h 10 22:30:02 IV? cloud to h 10, moonlit contrail? 22:45:19 IV? cloud to h 10, moonlit contrail?, bright spot above Arcturus 23:00:32 IV? cloud to h 5, two moonlit contrails? 23:15:31 IV? cloud to h 5, two moonlit contrails? 23:30:53 IV 1 cloud to h 5, two "contrails" 23:45:32 IV 2 cloud to h 5, one "contrail" 00:00:32 IV 3 8 cloud to h 5, one "contrail" 00:15:32 IV 3 8 cloud to h 5 00:30:32 IV 2 9 cloud to h 5 00:45:32 NLC 1 10 cloud to h 5 01:00:31 0 cloud to h 5 01:15:19 0 cloud to h 5 01:30:19 0 cloud to h 5 01:45:10 0 cloud to h 5 02:00:10 0 02:15:01 0 02:30:05 0 02:45:01 0 03:00:01 0 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: 2014/07/10-11 Start: 22:30 End: 00:45 Forms: IV Max elevation: 10 Max brightness: 3 Comments: Through cloud. <a href="http://www.chiandh.me.uk/nlccam/20140710-11.shtml">Images</a>. forms: I: veil II: bands III: waves IV: whirls NLC: other than or multiple of I-IV brightness: 1: very weak 2: clearly detected 3: clearly visible 4: very bright 5: extremely bright
The main periods of absence of NLC are reported to the NLC Observers' Home Page:
Name: Horst Meyerdierks Country: Scotland Location: Edinburgh Date: 2014/07/10-11 Start: 01:00 End: 03:00 Comments:
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) -------- ------ ----- ----- ----- ----- ----- ------------------- 22:30:02 1.000 334.8 -8.6 -0.9 120.9 0-255 q5210.jpg m5210.jpg 22:45:19 4.000 338.3 -9.5 -1.5 59.0 0-255 q5214.jpg m5214.jpg 23:00:32 8.000 341.8 -10.2 -2.1 31.2 0-255 q5218.jpg 23:15:31 8.000 345.2 -10.8 -2.5 21.4 0-255 q5222.jpg m5222.jpg 23:30:53 15.000 348.8 -11.3 -2.8 16.7 0-255 q5228.jpg m5228.jpg 23:45:32 8.000 352.3 -11.6 -3.0 14.3 0-255 q5232.jpg m5232.jpg 00:00:32 8.000 355.8 -11.8 -3.1 13.0 0-255 q5238.jpg 00:15:32 8.000 359.4 -11.9 -3.2 12.5 0-255 q5244.jpg 00:30:32 8.000 2.9 -11.9 -3.1 12.7 0-255 q5250.jpg 00:45:32 8.000 6.5 -11.7 -3.0 13.7 0-255 q5256.jpg m5256.jpg exp: Exposure time in seconds (200 ISO, f/2.8). 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).