NLC 2010-06-20/21
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: 2010-06-20/21
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:45 X widespread cloud patches
22:00 X cloud to h 12
22:15 X cloud to h 20 and above h 30
22:30 NLC? 1 2 0 5 only small clear areas
22:45 X widespread cloud patches
23:00 NLC? 1 2 0 5 widespread cloud patches
23:15 X cloud patches to h 20 and at h 30
23:30 I 1 17 <335 >360 cloud patches, lightbox top and right
23:45 I 2 17 325 >15 few cloud patches
00:00 I,III 2 18 318 >20 few cloud patches
00:15 I,III 3 18 312 >20 few cloud patches
00:30 I,III 3 19 <310 >20 almost clear
00:45 I,III,IV 3 19 ~310 >20 almost clear
01:00 I,III,IV 3 23 <310 >20 almost clear
01:15 I,III,IV 2 27 <310 >20 few cloud patches on horizon
01:30 I,III 2 35 <310 >20 few cloud patches on horizon
01:45 I,III 2 ~40 <310 >20 few cloud patches on horizon
02:00 I 2 whole field cloud to h 5
02:15 II 1 whole field cloud to h 5
02:30 0 cloud to h 7
02:45 0 cloud patches 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: Stichill
Date: 2010/06/20-21
Start: 23:30
End: 02:15
Forms: I,II,III
Max elevation: >40
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-06-20/21">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) ----- ------ ----- ----- ----- ----- ----- --------------------- 22:30 0.800 336.6 -8.0 -0.4 145.7 0-255 q30038.jpg m30038.jpg 23:00 2.500 343.4 -9.5 -1.5 59.9 0-255 q30042.jpg m30042.jpg 23:30 3.200 350.4 -10.4 -2.2 26.9 0-255 q30048.jpg m30048.jpg 23:45 4.000 353.8 -10.7 -2.4 22.5 0-255 q30052.jpg 00:00 8.000 357.3 -10.9 -2.5 20.6 0-255 q30057.jpg 00:15 10.000 0.8 -10.9 -2.5 20.2 0-255 q30061.jpg 00:30 8.000 4.3 -10.8 -2.5 21.3 0-255 q30065.jpg 00:45 6.000 7.8 -10.6 -2.3 24.3 0-255 q30069.jpg 01:00 5.000 11.3 -10.2 -2.1 30.6 0-255 q30072.jpg 01:15 3.200 14.8 -9.8 -1.7 45.1 0-255 q30075.jpg 01:30 2.000 18.2 -9.2 -1.3 81.4 0-255 q30077.jpg 01:45 1.300 21.6 -8.4 -0.7 130.8 0-255 q30079.jpg 02:00 0.600 25.0 -7.6 0.0 154.4 0-255 q30081.jpg 02:15 0.167 28.3 -6.7 1.2 164.5 0-255 q30082.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).
