NLC 2019-07-05/06
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: 2019-07-05/06
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:45:05 X almost overcast
22:00:01 X patchy cloud
22:15:02 X patchy cloud
22:30:08 X widespread cloud
22:45:10 X almost overcast
23:00:10 X widespread cloud
23:15:19 X widespread cloud
23:30:19 X almost overcast
23:45:31 X overcast
00:00:32 X overcast
00:15:32 X overcast
00:30:32 X almost overcast
00:45:09 II 3 6 through cloud
01:00:09 II 4 10 340 >35 clear
01:15:10 II 3 7 through cloud
01:30:09 II 2 6 through cloud
01:45:02 II 1 through cloud
02:00:03 X widespread cloud
02:15:02 X patchy cloud
02:30:05 0 almost clear
02:45:01 0 almost clear
03:00:04 0 almost clear
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: 2019-07-05/06
Start: 00:45
End: 01:45
Forms: II
Max elevation: 10
Max brightness: 4
Comments: through cloud
http://www.chiandh.eu/nlccam/20190705-06.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 00:45:09 2.000 6.5 -11.1 -2.6 18.3 0-255 q8927.jpg 01:00:09 2.000 10.0 -10.8 -2.4 21.4 0-255 q8932.jpg 01:15:10 2.000 13.5 -10.4 -2.2 27.8 0-255 q8937.jpg 01:30:09 2.000 16.9 -9.8 -1.8 42.4 0-255 q8941.jpg 01:45:02 1.000 20.4 -9.2 -1.3 81.2 0-255 q8943.jpg m8943.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).
