NLC 2009-07-03/04
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 5 min
Date: 2009-07-03/04
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ ------- ---- ---- --------------------------------
21:45 cloud
22:00 cloud
22:15 cloud
22:30 cloud
22:45 II,III 1 30 cloud below and on right
23:00 II,IV 2 30 cloud below and on right
23:15 II,IV 2 25 cloud below and on right
23:30 II,III,IV 2 20 cloud below
23:45 II,III 2 20 cloud below
00:00 III 2 15 cloud below and on right
00:15 II,III 3 20 0 cloud below
00:30 II,IV 3 20 0 cloud on right to h 5
00:45 II,IV 3 20 0 cloud on right to h 5
01:00 II,IV 3 15 0 clear
01:15 II,IV 3 15 0 clear
01:30 II,IV 3 15 0 clear
01:45 II,IV 3 25 0 clear
02:00 IV 3 35 clear
02:15 IV 2 40 clear
02:30 0 clear
02:45 0 clear
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: 2009/07/03-04
Start: 22:45
End: 02:15
Forms: II,III,IV
Max elevation: 35
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-03/04>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) ----- ------ ----- ----- ----- ----- ----- --------------------- 22:45 3.200 338.6 -8.8 -1.0 109.5 0-255 q04841.jpg m04841.jpg 23:00 6.000 342.0 -9.5 -1.6 57.4 0-255 q04847.jpg 23:15 10.000 345.5 -10.1 -2.0 34.0 0-255 q04856.jpg 23:30 8.000 349.0 -10.6 -2.3 24.7 0-200 q04867.jpg 23:45 8.000 352.5 -10.9 -2.5 20.3 0-150 q04879.jpg 00:00 8.000 356.0 -11.1 -2.6 18.2 0-150 q04891.jpg 00:15 15.000 359.5 -11.2 -2.7 17.4 0-255 q04904.jpg 00:30 8.000 3.0 -11.2 -2.7 17.8 0-150 q04919.jpg 00:45 8.000 6.5 -11.0 -2.6 19.5 0-200 q04931.jpg 01:00 8.000 10.0 -10.7 -2.4 23.1 0-255 q04943.jpg 01:15 4.000 13.5 -10.2 -2.1 30.4 0-150 q04955.jpg 01:30 4.000 17.0 -9.7 -1.7 47.9 0-255 q04964.jpg 01:45 2.000 20.4 -9.0 -1.2 92.5 0-255 q04972.jpg 02:00 2.000 23.8 -8.2 -0.6 139.2 0-255 q04976.jpg 02:15 1.000 27.2 -7.3 0.3 158.3 0-255 q04979.jpg exp: Exposure time in seconds (200 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).
