NLC 2009-07-03/04
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: 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.
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).
