
NLC 2018-07-01/02
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: 2018-07-01/02 UT forms bright height azimuth comments ness top bot left rght e.g. weather -------- ----- ------ --- --- ---- ---- -------------------------------- 21:45:04 0 clear 22:00:01 0 clear 22:15:05 0 clear 22:30:06 0 clear 22:45:08 0 clear 23:00:19 0 clear 23:15:18 0 clear 23:30:31 0 clear 23:45:32 II 2 5 0 20 clear 00:00:32 II 2 7 355 15 clear 00:15:32 IV 2 8 350 20 clear 00:30:33 I,IV 3 6 350 15 clear 00:45:32 I 3 8 350 >35 clear 01:00:18 X cloud to h 10, patches above 01:15:18 X almost overcast 01:30:19 X overcast 01:45:10 X overcast 02:00:09 X overcast 02:15:07 X overcast 02:30:06 X overcast 02:45:05 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: 2018/07/01-02 Start: 23:45 End: 00:45 Forms: I,II,IV Max elevation: 8 Max brightness: 3 Comments: Clear, cloud from 01:00. http://www.chiandh.eu/nlccam/20180701-02.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
The periods of absence of NLC are reported to the NLC Observers' Home Page:
Name: Horst Meyerdierks Country: Scotland Location: Edinburgh Date: 2018/07/01-02 Start: 21:45 End: 23:30 Comments: clear
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) -------- ------ ----- ----- ----- ----- ----- ------------------- 23:45:32 8.000 352.7 -10.7 -2.4 22.1 0-255 q0506.jpg 00:00:32 8.000 356.2 -10.9 -2.5 19.8 0-255 q0510.jpg 00:15:32 8.000 359.7 -11.0 -2.6 19.0 0-255 q0515.jpg 00:30:33 8.000 3.2 -11.0 -2.6 19.6 0-255 q0520.jpg 00:45:32 8.000 6.7 -10.8 -2.4 21.6 0-255 q0525.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).