NLC 2015-07-15/16
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: 2015-07-15/16
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:30:01 0 some cloud
21:45:01 0 some cloud
22:00:06 0 some cloud
22:15:03 0 some cloud
22:30:10 IV 3 10 5 35 through cloud
22:45:18 II,IV 3 12 355 >35 through cloud
23:00:32 II 3 through cloud
23:15:33 I 2 through cloud
23:30:53 X almost overcast
23:45:53 X almost overcast
00:00:47 X widespread cloud
00:15:47 X widespread cloud
00:30:47 X cloud to h 15
00:45:47 X cloud to h 15
01:00:53 X cloud to h 15
01:15:53 I,II 3 12 through cloud
01:30:32 I 3 14 through cloud
01:45:32 I 3 15 cloud to h 5
02:00:09 I 2 8 through cloud
02:15:09 X patchy cloud to h 10
02:30:06 X patchy cloud to h 15
02:45:01 0 patchy cloud to h 10
03:00:05 X haze and some cloud
03:15:01 X cirrus
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: 2015/07/15-16
Start: 22:30
End: 02:00
Forms: I,II,IV
Max elevation: 15
Max brightness: 3
Comments: Cloud 23:30-01:00.
http://www.chiandh.eu/nlccam/20150715-16.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 22:30:10 2.000 334.5 -9.3 -1.4 73.1 0-255 q4558.jpg 22:45:18 4.000 338.0 -10.1 -2.0 33.3 0-255 q4562.jpg 23:00:32 8.000 341.5 -10.9 -2.5 20.7 0-255 q4567.jpg 23:15:33 8.000 345.0 -11.5 -2.9 15.3 0-255 q4572.jpg 01:15:53 15.000 13.6 -11.7 -3.0 13.9 0-255 q4620.jpg 01:30:32 8.000 17.0 -11.2 -2.7 17.8 0-255 q4625.jpg 01:45:32 8.000 20.5 -10.5 -2.2 25.9 0-255 q4630.jpg 02:00:09 2.000 23.8 -9.7 -1.7 47.1 0-180 q4632.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).
