NLC 2019-06-27/28
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: 2019-06-27/28
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:45:01 0 clear, thin band of haze at h 5 or 10
22:00:01 0 clear, thin band of haze at h 5 or 10
22:15:02 0 clear, thin band of haze at h 5 or 10
22:30:02 NLC? 1 12 10 25 clear, thin band of haze at h 5 or 10
22:45:03 NLC? 1 12 10 35 clear, thin band of haze at h 5 or 10
23:00:02 II 1 10 340 >35 clear
23:15:09 II 2 10 330 >35 cloud to h 4
23:30:09 II 3 12 <325 >35 cloud to h 4
23:45:10 II 3 12 <325 >35 cloud to h 4
00:00:09 II,III 4 15 <325 >35 cloud to h 5
00:15:10 II,III 4 15 <325 >35 cloud to h 5
00:30:19 II,III 4 15 <325 >35 through cloud
00:45:19 II,III 3 15 <325 >35 through cloud
01:00:19 III 2 15 through cloud
01:15:19 X patchy cloud
01:30:18 X patchy cloud
01:45:09 X patchy cloud
02:00:06 X patchy cloud
02:15:06 X 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: 2019-06-27/28
Start: 22:30
End: 01:00
Forms: II,III
Max elevation: 15
Max brightness: 4
Comments: some cloud
http://www.chiandh.eu/nlccam/20190627-28.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 22:30:02 0.500 335.6 -7.6 0.0 154.1 0-255 q8376.jpg m8376.jpg 22:45:03 1.000 339.0 -8.4 -0.7 131.3 0-255 q8378.jpg m8378.jpg 23:00:02 1.000 342.4 -9.1 -1.3 84.3 0-255 q8380.jpg m8380.jpg 23:15:09 2.000 345.8 -9.7 -1.7 47.5 0-255 q8383.jpg 23:30:09 2.000 349.3 -10.2 -2.0 32.5 0-255 q8386.jpg 23:45:10 2.000 352.8 -10.5 -2.2 25.9 0-255 q8390.jpg 00:00:09 2.000 356.3 -10.7 -2.4 23.0 0-255 q8394.jpg 00:15:10 2.000 359.8 -10.8 -2.4 22.0 0-255 q8398.jpg 00:30:19 4.000 3.3 -10.7 -2.4 22.8 0-255 q8403.jpg 00:45:19 4.000 6.8 -10.5 -2.3 25.5 0-255 q8407.jpg 01:00:19 4.000 10.3 -10.2 -2.0 31.5 0-255 q8411.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).
