NLC 2018-06-18/19
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: 2018-06-18/19
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:45:01 0 clear
22:00:02 0 clear
22:15:01 I 1 40 <325 30 clear
22:30:02 I,III 2 45 <325 30 clear
22:45:02 IV 2 45 <325 >35 clear
23:00:02 IV 2 35 <325 >35 clear
23:15:17 I,IV 3 30 <325 >35 clear, thin patchy cloud above
23:30:18 I,IV 4 25 <325 >35 clear, thin patchy cloud above
23:45:19 I,IV 5 20 <325 >35 clear, thin patchy cloud above
00:00:10 I,IV 5 17 <325 >35 clear, thin patchy cloud above
00:15:09 I,IV 5 17 <325 >35 clear, thin patchy cloud above
00:30:10 I,IV 5 15 <325 >35 clear, thin patchy cloud above
00:45:10 I,IV 4 17 <325 >35 thin cloud patches
01:00:08 I,IV 4 22 <325 >35 thin cloud patches
01:15:08 II,III,IV 4 30 <325 >35 thin cloud patches
01:30:02 II,III,IV 4 40 <325 >35 cloud patches to h 20
01:45:02 II,III 3 45 <325 >35 cloud patches to h 15
02:00:02 III 2 45 335 30 cloud to h 10 or 15, higher patches
02:15:02 III 2 50 cloud to h 10 or 15, higher patches
02:30:05 III 1 30 cloud to h 10
02:45:04 III 1 20 cloud to h 10
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: 2018/06/18-19
Start: 22:15
End: 02:45
Forms: I,II,III,IV
Max elevation: 50
Max brightness: 5
Comments: thin patchy cloud
http://www.chiandh.eu/nlccam/20180618-19.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 22:15:01 0.250 332.7 -6.7 1.0 163.9 0-255 q9716.jpg m9716.jpg 22:30:02 0.500 336.1 -7.6 -0.0 153.7 0-255 q9718.jpg m9718.jpg 22:45:02 1.000 339.4 -8.4 -0.7 130.8 0-255 q9720.jpg 23:00:02 1.000 342.9 -9.1 -1.3 84.7 0-255 q9722.jpg 23:15:17 4.000 346.4 -9.7 -1.7 48.3 0-255 q9726.jpg 23:30:18 4.000 349.8 -10.1 -2.0 33.4 0-255 q9729.jpg 23:45:19 4.000 353.3 -10.4 -2.2 26.9 0-255 q9733.jpg 00:00:10 2.000 356.8 -10.6 -2.3 24.0 0-255 q9736.jpg 00:15:09 2.000 0.3 -10.7 -2.4 23.3 0-255 q9740.jpg 00:30:10 2.000 3.8 -10.6 -2.3 24.3 0-255 q9744.jpg 00:45:10 2.000 7.3 -10.4 -2.2 27.7 0-255 q9748.jpg 01:00:08 2.000 10.7 -10.1 -1.9 35.1 0-255 q9752.jpg 01:15:08 2.000 14.2 -9.6 -1.6 52.3 0-255 q9756.jpg 01:30:02 1.000 17.6 -9.0 -1.2 91.8 0-255 q9758.jpg 01:45:02 1.000 21.0 -8.3 -0.6 135.3 0-255 q9760.jpg 02:00:02 0.500 24.4 -7.5 0.1 155.6 0-255 q9762.jpg 02:15:02 0.250 27.7 -6.6 1.2 164.9 0-255 q9764.jpg 02:30:05 0.125 31.0 -5.6 3.3 170.1 0-255 q9767.jpg m9767.jpg 02:45:04 0.067 34.3 -4.4 11.4 173.5 0-255 q9769.jpg m9769.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).
