
NLC 2010-07-17/18
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: Stichill Eastfield, 55.7N 2.4W unattended dSLR with limited field of view A ~310-20, h ~0-40 images every 15 min Date: 2010-07-17/18 UT forms bright height azimuth comments ness top bot left rght e.g. weather ----- ----- ------ --- --- ---- ---- -------------------------------- 21:15 X thin cover of cirrus 21:30 X thin cover of cirrus 21:45 X cirrus to h 20 22:00 X cirrus to h 15 22:15 X cirrus to h 10, cloud to h 25 on left 22:30 0 cloud on left and above h 20 22:45 NLC? 4 5 15 cloud patches on left and at top 23:00 II 1 4 6 >15 cloud on horizon on left, minor patches up high 23:15 II 1 4 <360 >15 cloud on horizon on left 23:30 II 2 4 0 15 cloud on left 23:45 IV 2 5 0 12 cloud on left and above 00:00 NLC 2 through cloud 00:15 X only part of field clear, lightbox 00:30 X almost overcast, lightbox 00:45 NLC through cloud, lightbox 01:00 X almost overcast, lightbox 01:15 X almost overcast 01:30 X overcast 01:45 X overcast 02:00 X overcast 02:15 X overcast 02:30 X overcast 02:45 X overcast 03:00 X almost overcast 03:15 X cloud to h 20 or 30 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: Stichill Date: 2010/07/17-18 Start: 22:45 End: 00:45 Forms: II,IV Max elevation: 5 Max brightness: 2 Comments: <a href="http://www.chiandh.me.uk/p/NLC_2010-07-17/18">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 4.000 338.5 -10.9 -2.5 20.6 0-255 q31943.jpg m31943.jpg 23:00 15.000 342.0 -11.6 -2.9 14.5 0-255 q31949.jpg m31949.jpg 23:15 25.000 345.5 -12.2 -3.3 11.3 0-255 q31955.jpg m31955.jpg 23:30 30.000 349.0 -12.7 -3.6 9.5 0-255 q31961.jpg 23:45 30.000 352.6 -13.0 -3.8 8.4 0-255 q31967.jpg 00:00 30.000 356.2 -13.2 -3.9 7.7 0-255 q31973.jpg 00:45 30.000 7.0 -13.0 -3.8 8.2 0-255 q31991.jpg m31991.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).