NLC 2010-07-23/24
From chi and h
Contents |
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: 2010-07-23/24
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:15 X only few clear areas
21:30 X cirrus to h 7, cumulus on right
21:45 X cirrus to h 8
22:00 X cirrus to h 10, some higher patches
22:15 X cloud in various parts of field
22:30 X cirrus to h 20
22:45 X cirrus to h 25
23:00 X cirrus to h 20 or 25
23:15 X cirrus to h 30
23:30 II 2 3 <350 >0 through cloud
23:45 II 2 4 <350 >5 through cloud
00:00 NLC? 3 through cloud
00:15 NLC? 4 through cloud
00:30 NLC 2 4 through cloud
00:45 NLC 3 4 <340 >15 through cloud
01:00 NLC 4 5 <340 >15 some cloud in front
01:15 NLC 4 6 350 >15 some cloud in front
01:30 I,II 4 7 335 >15 some cloud in front
01:45 I,II 5 8 335 >15 some cloud in front
02:00 I,II 4 8 330 >15 almost clear
02:15 I,III 4 9 <330 >15 almost clear
02:30 I,III 3 9 <330 >15 some cloud in front
02:45 NLC? 1 some cloud in front
03:00 X cirrus to h 10
03:15 X cirrus to h 10 or 15
03:30 X cirrus 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: 2010/07/23-24
Start: 23:30
End: 02:45
Forms: I,II,III
Max elevation: 9
Max brightness: 5
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-07-23/24">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) ----- ------ ----- ----- ----- ----- ----- ------------------------- 23:30 30.000 348.8 -13.8 -4.3 6.3 0-255 q32584.jpg 23:45 30.000 352.4 -14.1 -4.4 5.5 0-255 q32590.jpg 00:00 30.000 356.1 -14.3 -4.6 5.1 0-255 q32596.jpg 00:15 30.000 359.7 -14.4 -4.6 4.9 0-255 q32602.jpg 00:30 30.000 3.3 -14.4 -4.6 5.0 0-255 q32608.jpg 00:45 30.000 7.0 -14.2 -4.5 5.4 0-255 q32614.jpg 01:00 30.000 10.6 -13.9 -4.3 6.1 0-255 q32620.jpg 01:15 15.000 14.2 -13.4 -4.0 7.2 0-255 q32625.jpg 01:30 15.000 17.8 -12.8 -3.7 8.9 0-255 q32631.jpg 01:45 6.000 21.3 -12.1 -3.3 11.6 0-255 q32636.jpg 02:00 6.000 24.8 -11.3 -2.8 16.6 0-255 q32642.jpg 02:15 3.200 28.3 -10.4 -2.2 28.2 0-255 q32646.jpg 02:30 2.500 31.7 -9.3 -1.4 70.9 0-255 q32649.jpg m32649.jpg 02:45 0.500 35.0 -8.1 -0.5 142.3 0-255 q32650.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).
