NLC 2010-06-19/20
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: Stichill Eastfield, 55.7N 2.4W
unattended dSLR with limited field of view A ~310-20, h ~0-40
images every 15 min
Date: 2010-06-19/20
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:45 0 clear, 10% overexposed
22:00 0 clear, 10% overexposed
22:15 0 clear, 10% overexposed
22:30 0 clear, 10% overexposed
22:45 0 clear, 10% overexposed
23:00 X cloud on the left
23:15 X sizable cloud patch, fake NLC?
23:30 0 almost clear
23:45 0 almost clear
00:00 II,IV 1 10 320 5 almost clear
00:15 II,IV 1 8 315 3 almost clear
00:30 IV 1 10 315 340 cloud to h 3
00:45 IV 1 13 315 360 cloud to h 4
01:00 IV 1 15 318 355 cloud to h 4
01:15 II 2 17 313 355 cloud to h 3
01:30 II 2 18 315 352 cloud to h 4
01:45 II 1 20 <310 350 cloud to h 5
02:00 II 1 18 <310 330 almost clear
02:15 0 cloud to h 10
02:30 0 cloud to h 7
02:45 0 cloud to h 4
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: Stichill
Date: 2010/06/19-20
Start: 00:00
End: 02:00
Forms: II,IV
Max elevation: 20
Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-06-19/20">Images</a>.
forms: I: veil
II: bands
III: waves
IV: whirls
O: 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) ----- ------ ----- ----- ----- ----- ----- --------------------- 00:00 4.000 357.4 -10.9 -2.5 20.5 0-255 q30003.jpg m30003.jpg 00:15 4.000 0.9 -10.9 -2.5 20.1 0-255 q30007.jpg m30007.jpg 00:30 4.000 4.4 -10.8 -2.5 21.2 0-255 q30011.jpg m30011.jpg 00:45 4.000 7.9 -10.6 -2.3 24.2 0-255 q30015.jpg m30015.jpg 01:00 2.000 11.4 -10.2 -2.1 30.6 0-255 q30018.jpg m30018.jpg 01:15 2.000 14.8 -9.8 -1.7 45.1 0-255 q30021.jpg m30021.jpg 01:30 1.000 18.3 -9.2 -1.3 81.7 0-255 q30023.jpg m30023.jpg 01:45 1.000 21.7 -8.4 -0.7 131.0 0-255 q30025.jpg m30025.jpg 02:00 0.600 25.0 -7.6 0.0 154.5 0-255 q30026.jpg m30026.jpg exp: Exposure time in seconds (400 ISO, f/3.5). 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).
In addition, the following images were taken from Edinburgh, 55.9N 3.2W. The field of view is the same size, but the camera was pointed at various different directions.
UT exp stretch image (masked) ----- ------ ----- ------------------------- 23:52 2.500 0-255 q15333.jpg 00:00 2.500 0-255 q15334.jpg 00:08 2.500 0-255 q15335.jpg 00:09 2.500 0-255 q15336.jpg 00:16 2.500 0-255 q15337.jpg m15337.jpg 00:20 2.500 0-255 q15338.jpg m15338.jpg 00:21 2.500 0-255 q15339.jpg m15339.jpg 00:21 2.500 0-255 q15340.jpg m15340.jpg 00:30 2.500 0-255 q15341.jpg m15341.jpg 00:30 2.500 0-255 q15342.jpg m15342.jpg 00:30 2.500 0-255 q15343.jpg m15343.jpg 00:45 2.500 0-255 q15344.jpg m15344.jpg 00:45 2.500 0-255 q15345.jpg m15345.jpg 00:45 2.500 0-255 q15346.jpg m15346.jpg exp: Exposure time in seconds (400 ISO, f/3.5). stretch: Contrast stretch (0-255 means no stretch).
