NLC 2013-07-30/31
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 compact camera with limited field of view
A ~325-35, h ~0-40; images every 15 min
Date: 2013-07-30/31
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:00:01 X widespread cloud
21:15:01 X widespread cloud
21:30:02 X widespread cloud
21:45:03 X widespread cloud
22:00:33 0 cloud to h 10
22:15:32 X almost overcast
22:30:52 X cloud to h 10, some higher
22:45:47 X widespread cloud
23:01:24 X cloud to h 5
23:16:24 X cloud on horizon
23:31:24 X cloud on horizon
23:46:24 X cloud on horizon
00:01:24 X cloud on horizon
00:16:24 X cloud on horizon
00:30:47 X cloud on horizon
00:46:24 NLC 2 5 15 35 through cloud
01:01:24 I,II 3 5 10 >35 cloud to the left
01:15:47 I,II 3 5 -5 >35 through cloud
01:30:26 I,III 3 5 -10 >35
01:45:25 I,III 4 8 -20 >35
02:00:13 I,II 5 9 -20 >35
02:15:19 I,II 5 9 -25 >35
02:30:10 I,IV 5 12 -30 >35
02:45:10 IV 3 12 -35 >35
03:00:03 II 2 12 -30 30
03:15:02 0
03:30:01 0
03:45:01 0
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: 2013/07/30-31
Start: 00:45
End: 03:00
Forms: I,II,III,IV
Max elevation: 12
Max brightness: 5
Comments:
<a href="http://www.chiandh.me.uk/nlccam/20130730-31.shtml">Images</a>.
forms: I: veil
II: bands
III: waves
IV: whirls
NLC: 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) -------- ------ ----- ----- ----- ----- ----- ------------------- 00:46:24 30.000 6.7 -15.6 -5.3 3.0 0-255 q8334.jpg m8334.jpg 01:01:24 30.000 10.4 -15.3 -5.1 3.5 0-255 q8340.jpg 01:15:47 15.000 13.9 -14.9 -4.9 4.1 0-255 q8345.jpg m8345.jpg 01:30:26 8.000 17.5 -14.3 -4.5 5.2 0-255 q8350.jpg 01:45:25 8.000 21.1 -13.6 -4.2 6.7 0-255 q8356.jpg 02:00:13 4.000 24.6 -12.8 -3.7 8.9 0-255 q8361.jpg 02:15:19 4.000 28.1 -11.9 -3.1 12.9 0-255 q8368.jpg 02:30:10 2.000 31.5 -10.8 -2.5 20.9 0-255 q8373.jpg 02:45:10 2.000 35.0 -9.7 -1.7 47.9 0-255 q8378.jpg 03:00:03 1.000 38.3 -8.5 -0.7 130.2 0-255 q8380.jpg m8380.jpg exp: Exposure time in seconds (200 ISO, f/2.8). 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).
