NLC 2011-07-02/03
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: 2011-07-02/03
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ --- --- ---- ---- --------------------------------
21:45 X cloud
22:00 X cloud
22:15 X cloud
22:30 X cloud
22:45 X cloud
23:00 0 cloud to h 10, higher on right
23:15 NLC? through cirrus
23:30 I,II 3 12 340 >35 through cirrus
23:45 I,II 3 14 <325 >35 some cirrus
00:00 III,IV 4 12 <325 >35 some cirrus/haze
00:15 II,IV 4 12 <325 >35 haze on horizon
00:30 II,IV 5 14 <325 >30 haze on horizon
00:45 II,IV 5 15 <325 30 haze on horizon
01:00 III,IV 5 18 <325 30 haze on horizon
01:15 III,IV 5 21 <325 32 haze on horizon
01:30 III,IV 5 22 <325 >35 haze on horizon
01:45 III,IV 4 24 <325 35 haze on horizon
02:00 IV 3 27 <325 35 haze on horizon
02:15 IV 2 29 <325 17 haze on horizon
02:30 I,IV 2 25 <325 0 haze on horizon
02:45 I 1 22 <325 345 haze on horizon
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: 2011/07/02-03
Start: 23:15
End: 02:45
Forms: I,II,III,IV
Max elevation: 29
Max brightness: 5
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2011-07-02/03">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) ----- ------ ----- ----- ----- ----- ----- --------------------- 23:15 2.000 345.6 -10.0 -1.9 37.1 0-255 q14930.jpg m14930.jpg 23:30 3.200 349.0 -10.4 -2.2 26.5 0-255 q14934.jpg 23:45 4.000 352.5 -10.8 -2.4 21.6 0-255 q14938.jpg 00:00 2.500 356.1 -11.0 -2.6 19.3 0-255 q14941.jpg 00:15 2.500 359.6 -11.1 -2.6 18.5 0-255 q14945.jpg 00:30 2.500 3.1 -11.0 -2.6 19.0 0-255 q14949.jpg 00:45 2.000 6.6 -10.9 -2.5 20.8 0-255 q14953.jpg 01:00 1.300 10.1 -10.5 -2.3 24.9 0-255 q14957.jpg 01:15 1.300 13.6 -10.1 -2.0 33.4 0-255 q14960.jpg 01:30 0.800 17.0 -9.6 -1.6 54.3 0-255 q14963.jpg 01:45 0.800 20.5 -8.9 -1.1 102.8 0-255 q14966.jpg 02:00 0.400 23.9 -8.1 -0.4 143.5 0-255 q14968.jpg 02:15 0.200 27.2 -7.2 0.5 159.8 0-255 q14970.jpg 02:30 0.100 30.5 -6.2 1.9 167.4 0-255 q14972.jpg 02:45 0.040 33.8 -5.1 5.2 171.8 0-255 q14974.jpg m14974.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).
