NLC 2012-06-24/25
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 dSLR with limited field of view A ~325-35, h ~0-40
images every 15 min
Date: 2012-06-24/25
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:45 X cloud to h 15
22:00 X cloud to h 10, on left to h 30
22:15 X cloud to h 15, higher patches
22:30 I,III,IV 2 35 <325 >35 cloud patches to h 15
22:45 II,III,IV 3 40 8 <325 >35 cloud patches to h 10
23:00 II,III,IV 3 30 5 <325 >35 some cloud patches
23:15 I,III,IV 4 27 5 <325 >35 some cloud patches to h 10
23:30 III,IV 4 18 5 <325 >35 some cloud patches
23:45 II,IV 4 15 3 <325 >35 through cloud
00:00 II,IV 4 15 5 <325 >35 through cloud
00:15 III,IV 3 18 5 325 >35 some cloud patches
00:30 IV 2 18 335 >35 through cloud
00:45 IV 2 15 15 >35 through cloud
01:00 I,IV 2 15 335 >35 through cloud
01:15 I,IV 2 10 330 30 through cloud
01:30 I 1 10 <325 35 through cloud
01:45 X cloud to h 15 or 20
02:00 X cloud widespread
02:15 X cloud widespread
02:30 X cloud widespread
02:45 X cloud widespread
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: 2012/06/24-25
Start: 22:30
End: 01:30
Forms: I,II,III,IV
Max elevation: 40
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2012-06-24/25">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 0.300 335.7 -7.6 0.0 154.5 0-255 q00096.jpg m00096.jpg 22:45 1.000 339.1 -8.4 -0.7 132.5 0-255 q00099.jpg m00099.jpg 23:00 1.000 342.5 -9.1 -1.3 86.8 0-255 q00100.jpg 23:15 1.300 346.0 -9.7 -1.7 49.3 0-255 q00103.jpg 23:30 1.300 349.4 -10.1 -2.0 33.6 0-255 q00105.jpg 23:45 1.300 352.9 -10.4 -2.2 26.8 0-255 q00109.jpg 00:00 4.000 356.4 -10.6 -2.3 23.7 0-255 q00114.jpg 00:15 4.000 359.9 -10.7 -2.4 22.8 0-255 q00118.jpg 00:30 4.000 3.4 -10.6 -2.3 23.6 0-255 q00122.jpg 00:45 3.200 6.9 -10.4 -2.2 26.5 0-255 q00126.jpg 01:00 2.500 10.4 -10.1 -2.0 33.1 0-255 q00129.jpg 01:15 1.300 13.9 -9.7 -1.7 48.0 0-255 q00132.jpg 01:30 1.000 17.3 -9.1 -1.3 84.0 0-255 q00134.jpg m00134.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).
