
NLC 2018-07-29/30
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: 2018-07-29/30 UT forms bright height azimuth comments ness top bot left rght e.g. weather -------- ----- ------ --- --- ---- ---- -------------------------------- 21:00:01 X widespread cloud 21:15:02 0 some cloud 21:30:05 NLC 1 20 350 30 cloud below, some above 21:45:09 II,IV 2 40 325 30 some cloud patches 22:00:19 II,IV 2 30 <325 35 some cloud patches on right 22:15:32 II,IV 3 20 <325 some cloud patches on right 22:30:53 II,IV 3 15 <325 25 some cloud patches 22:46:25 IV 3 12 <325 20 some cloud patches 23:01:24 IV 3 10 <325 through cloud 23:16:24 NLC 3 5 through cloud 23:31:24 NLC 3 5 through cloud 23:46:24 NLC 2 through cloud 00:01:24 X widespread cloud 00:16:24 X cloud to h 15 or 20 00:31:25 X cloud to h 10 or 15 00:46:24 X widespread cloud 01:01:24 X widespread cloud 01:16:24 NLC 3 through cloud 01:31:24 NLC 3 through cloud 01:45:47 X almost overcast 02:00:47 X overcast 02:16:30 X overcast 02:30:32 X overcast 02:45:19 X overcast 03:00:08 X overcast 03:15:06 X almost overcast 03:30:05 X almost overcast 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: 2018/07/29-30 Start: 21:30 End: 01:30 Forms: II,IV Max elevation: 40 Max brightness: 3 Comments: Increasing amount of cloud. http://www.chiandh.eu/nlccam/20180729-30.shtml 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
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) -------- ------ ----- ----- ----- ----- ----- ------------------- 21:30:05 0.500 320.0 -7.4 0.2 157.3 0-255 q3095.jpg m3095.jpg 21:45:09 2.000 323.3 -8.7 -1.0 115.4 0-255 q3097.jpg 22:00:19 4.000 326.8 -9.9 -1.9 38.8 0-255 q3100.jpg 22:15:32 8.000 330.2 -11.0 -2.6 18.8 0-255 q3104.jpg 22:30:53 15.000 333.8 -12.1 -3.2 11.9 0-255 q3110.jpg 22:46:25 30.000 337.5 -13.0 -3.8 8.5 0-255 q3116.jpg 23:01:24 30.000 341.0 -13.7 -4.2 6.4 0-255 q3122.jpg 23:16:24 30.000 344.6 -14.3 -4.6 5.1 0-255 q3128.jpg 23:31:24 30.000 348.3 -14.8 -4.8 4.2 0-255 q3134.jpg 23:46:24 30.000 351.9 -15.2 -5.0 3.6 0-255 q3140.jpg m3140.jpg 01:16:24 30.000 14.0 -14.5 -4.7 4.7 0-255 q3176.jpg m3176.jpg 01:31:24 30.000 17.6 -14.0 -4.4 5.8 0-255 q3182.jpg m3182.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).