NLC 2019-07-15/16
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: 2019-07-15/16
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:30:04 X haze to h 30
21:45:05 X haze to h 30
22:00:05 X haze to h 30
22:15:08 X haze to h 30
22:30:19 X haze and thin cloud
22:45:32 X haze and thin cloud
23:00:53 X haze and thin cloud
23:15:53 X haze and thin cloud
23:31:30 X haze and thin cloud
23:46:31 X haze and thin cloud
00:01:24 X haze and thin cloud
00:16:24 X haze and thin cloud
00:31:24 NLC 2 through thick haze
00:46:24 II 2 through thick haze
01:01:31 II 2 through thick haze
01:16:31 II 2 through thick haze
01:30:53 II 3 13 thick haze below
01:45:31 II 3 13 thick haze below
02:00:09 II,IV 2 14 through cloud
02:15:09 NLC through cloud
02:30:06 X cloud and haze to h 30
02:45:05 X cloud and haze to h 30
03:00:05 X cloud and haze to h 30
03:15:04 X cloud and haze to h 30
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: 2019-07-15/16
Start: 00:30
End: 02:15
Forms: II,IV
Max elevation: 14
Max brightness: 3
Comments: through cloud
http://www.chiandh.eu/nlccam/20190715-16.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 00:31:24 30.000 3.0 -12.6 -3.5 9.8 0-255 q9754.jpg 00:46:24 30.000 6.5 -12.4 -3.4 10.4 0-255 q9760.jpg 01:01:31 30.000 10.1 -12.1 -3.3 11.8 0-255 q9767.jpg 01:16:31 30.000 13.7 -11.7 -3.0 14.1 0-255 q9773.jpg 01:30:53 15.000 17.0 -11.1 -2.7 18.0 0-255 q9778.jpg 01:45:31 8.000 20.4 -10.5 -2.2 26.1 0-255 q9782.jpg 02:00:09 2.000 23.8 -9.7 -1.7 47.4 0-255 q9784.jpg 02:15:09 2.000 27.2 -8.8 -1.0 109.3 0-255 q9787.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).
