NLC 2010-07-16/17
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: 2010-07-16/17
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 0 cloud to h 5, patches near top
21:30 0 cloud to h 5
21:45 0 cloud to h 10
22:00 0 cloud to h 10
22:15 X cloud to h ~10
22:30 II 1 7 ~10 cloud to h ~5, lightbox
22:45 II,IV 2 8 <340 ~10 cloud to h ~3, some higher, lightbox
23:00 II,IV 3 8 <330 ~15 cloud to h 3-8, lightbox
23:15 II,IV 3 8 <335 ~15 cloud to h 3, to h 8 on left, lightbox
23:30 II 2 9 cloud to h 3, to h 8 on left, lightbox
23:45 NLC low, through cloud, lightbox
00:00 NLC low, through cloud, lightbox
00:15 NLC low, through cloud, lightbox
00:30 NLC low, through cloud, lightbox
00:45 II 2 7 through cloud, clear above
01:00 II 2 7 through cloud, clear above
01:15 I,II 2 7 through cloud, clear above
01:30 I,II 2 10 <350 >15 cloud to h 5
01:45 I,III 2 12 ~350 >15 cloud to h 6
02:00 NLC 1 15 350 >15 cloud to h 7, patches at h 13
02:15 III 1 25 20 5 10 cloud to h 7 or 10, patches to h 15
02:30 III 1 20 18 0 7 cloud to h 10, on left to h 15
02:45 0 cloud patches to h 20
03:00 0 cloud patches to h 20
03:15 0 cloud patches to h 20
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: 2010/07/16-17
Start: 22:30
End: 02:30
Forms: I,II,III,IV
Max elevation: 25
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-07-16/17">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 2.000 335.1 -9.9 -1.8 40.8 0-255 q31840.jpg m31840.jpg 22:45 4.000 338.5 -10.7 -2.4 22.6 0-255 q31844.jpg m31844.jpg 23:00 4.000 342.0 -11.4 -2.8 15.7 0-255 q31848.jpg m31848.jpg 23:15 13.000 345.5 -12.0 -3.2 12.1 0-255 q31855.jpg m31855.jpg 23:30 15.000 349.1 -12.5 -3.5 10.1 0-255 q31861.jpg m31861.jpg 23:45 15.000 352.6 -12.8 -3.7 8.9 0-255 q31867.jpg m31867.jpg 00:00 15.000 356.2 -13.0 -3.8 8.2 0-255 q31873.jpg m31873.jpg 00:15 15.000 359.8 -13.1 -3.9 8.0 0-255 q31879.jpg m31879.jpg 00:30 15.000 3.4 -13.0 -3.8 8.2 0-255 q31885.jpg m31885.jpg 00:45 30.000 7.0 -12.9 -3.7 8.8 0-255 q31892.jpg m31892.jpg 01:00 15.000 10.5 -12.5 -3.5 9.9 0-255 q31897.jpg m31897.jpg 01:15 13.000 14.1 -12.1 -3.3 11.8 0-255 q31903.jpg m31903.jpg 01:30 8.000 17.6 -11.5 -2.9 15.0 0-255 q31908.jpg m31908.jpg 01:45 4.000 21.1 -10.8 -2.5 21.3 0-255 q31912.jpg m31912.jpg 02:00 2.000 24.6 -10.0 -1.9 36.8 0-255 q31915.jpg m31915.jpg 02:15 2.000 28.0 -9.1 -1.2 89.3 0-255 q31918.jpg m31918.jpg 02:30 0.800 31.3 -8.0 -0.4 145.8 0-255 q31920.jpg m31920.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).
