
NLC 2019-06-22/23
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: 2019-06-22/23 UT forms bright height azimuth comments ness top bot left rght e.g. weather -------- ----- ------ --- --- ---- ---- -------------------------------- 21:45:05 X thick transparent cloud 22:00:05 X thick transparent cloud 22:15:06 X thick transparent cloud 22:30:07 X thick transparent cloud 22:45:10 X thick transparent cloud 23:00:10 X almost overcast 23:15:19 X almost overcast 23:30:32 X overcast 23:45:31 X thick transparent cloud 00:00:32 X thick transparent cloud 00:15:32 X thick transparent cloud 00:30:32 NLC? through thick transparent cloud 00:45:32 IV through thick transparent cloud 01:00:32 IV through thick transparent cloud 01:15:19 IV 3 through thick transparent cloud 01:30:09 IV 3 through thick transparent cloud 01:45:08 III,IV through thick transparent cloud 02:00:06 X thick transparent cloud 02:15:06 X almost overcast 02:30:05 X overcast 02:45:04 X 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: 2019-06-22/23 Start: 00:30 End: 01:45 Forms: III,IV Max elevation: Max brightness: 3 Comments: through thick transparent cloud http://www.chiandh.eu/nlccam/20190622-23.html 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) -------- ------ ----- ----- ----- ----- ----- ------------------- 00:30:32 8.000 3.6 -10.6 -2.3 24.8 0-255 q8113.jpg 00:45:32 8.000 7.1 -10.4 -2.2 28.2 0-255 q8117.jpg 01:00:32 8.000 10.6 -10.0 -1.9 35.7 0-255 q8121.jpg 01:15:19 4.000 14.0 -9.6 -1.6 52.8 0-255 q8124.jpg 01:30:09 2.000 17.4 -9.0 -1.2 91.8 0-255 q8126.jpg 01:45:08 2.000 20.8 -8.3 -0.7 135.0 0-255 q8128.jpg m8128.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).