NLC 2011-07-09/10
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: 2011-07-09/10
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:30 0 cloud to h 8
21:45 0 cloud to h 6
22:00 0 cloud to h 5
22:15 I,II 1 16 355 >35
22:30 I,II 2 19 330 >35
22:45 I,II 3 19 <325 >35
23:00 II,III 3 20 <325 >35
23:15 III,IV 3 17 <325 >35
23:30 I,III 3 15 <235 >35
23:45 I,IV 4 10 >35 cloud on left
00:00 NLC 4 through cloud
00:15 I,IV 4 10 through cloud
00:30 I,III 5 11 through cloud
00:45 III 5 12 through cloud
01:00 III 5 13 through cloud
01:15 NLC 5 17 through cloud
01:30 NLC 5 18 through cloud
01:45 I,II 5 20 through cloud, overexposed
02:00 I,II,III 5 25 through cloud, overexposed
02:15 I,II,III 3 >40 cloud below, overexposed
02:30 II,III 2 35
02:45 II 1
03:00 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: 2011/07/09-10
Start: 22:15
End: 02:45
Forms: I,II,III,IV
Max elevation: >40
Max brightness: 5
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2011-07-09/10">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) ----- ------ ----- ----- ----- ----- ----- --------------------- 22:15 0.300 331.5 -7.5 0.1 155.5 0-255 q15377.jpg m15377.jpg 22:30 0.600 334.9 -8.5 -0.8 128.9 0-255 q15379.jpg 22:45 1.300 338.3 -9.3 -1.4 69.8 0-255 q15381.jpg 23:00 2.000 341.7 -10.0 -1.9 35.7 0-255 q15384.jpg 23:15 2.000 345.2 -10.6 -2.3 23.6 0-255 q15387.jpg 23:30 2.500 348.7 -11.1 -2.6 18.2 0-255 q15391.jpg 23:45 4.000 352.2 -11.5 -2.9 15.4 0-255 q15396.jpg 00:00 4.000 355.7 -11.7 -3.0 14.0 0-255 q15401.jpg 00:15 2.500 359.3 -11.8 -3.1 13.4 0-255 q15405.jpg 00:30 1.300 2.8 -11.7 -3.0 13.6 0-255 q15409.jpg 00:45 1.000 6.4 -11.6 -2.9 14.7 0-255 q15414.jpg 01:00 0.800 9.9 -11.3 -2.8 16.8 0-255 q15419.jpg 01:15 1.000 13.4 -10.9 -2.5 20.8 0-255 q15424.jpg 01:30 0.800 16.9 -10.3 -2.1 29.2 0-255 q15428.jpg 01:45 0.800 20.3 -9.6 -1.7 50.6 0-255 q15432.jpg 02:00 0.800 23.8 -8.8 -1.1 106.0 0-255 q15435.jpg 02:15 0.400 27.2 -7.9 -0.3 147.6 0-255 q15437.jpg 02:30 0.167 30.5 -6.9 0.8 162.3 0-255 q15439.jpg 02:45 0.067 33.8 -5.8 2.6 169.1 0-255 q15441.jpg m15441.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).
