
NLC 2019-06-17/18
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: Royal Observatory Edinburgh, 55.9N 3.2W unattended compact camera with limited field of view A ~325-35, h ~0-40; images every 15 min Date: 2019-06-17/18 UT forms bright height azimuth comments ness top bot left rght e.g. weather -------- ----- ------ --- --- ---- ---- -------------------------------- 21:45:05 X cloud to h 5 or 10, higher on left 22:00:05 X almost overcast 22:15:06 X almost overcast 22:30:08 X almost overcast 22:45:09 X almost overcast 23:00:10 NLC 2 25 through cloud 23:15:10 NLC 3 through cloud 23:30:32 X almost overcast 23:45:32 X almost overcast 00:00:18 NLC 3 through cloud 00:15:32 I,III 3 20 <325 >35 through cloud 00:30:19 I,III 3 20 >35 through cloud 00:45:09 X almost overcast 01:00:19 NLC 3 <325 through cloud 01:15:09 I,IV 3 <325 through cloud 01:30:09 X almost overcast 01:45:08 II,III 2 >45 through cloud 02:00:07 II 1 >45 cloud below 02:15:05 II 1 through cloud 02:30:04 0 cloud to h 10 and above h 30 02:45:04 0 cloud to h 10 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: 2019-06-17/18 Start: 23:00 End: 02:15 Forms: I,II,III,IV Max elevation: >45 Max brightness: 3 Comments: through cloud http://www.chiandh.eu/nlccam/20190617-18.html forms: I: veil II: bands III: waves IV: whirls NLC: 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) -------- ------ ----- ----- ----- ----- ----- ------------------- 23:00:10 2.000 342.9 -9.1 -1.3 83.8 0-255 q7800.jpg 23:15:10 2.000 346.4 -9.7 -1.7 48.2 0-255 q7802.jpg 00:00:18 4.000 356.8 -10.6 -2.3 24.0 0-255 q7814.jpg 00:15:32 8.000 0.4 -10.7 -2.4 23.3 0-255 q7819.jpg 00:30:19 4.000 3.8 -10.6 -2.3 24.3 0-255 q7822.jpg 01:00:19 4.000 10.8 -10.0 -1.9 35.3 0-255 q7830.jpg 01:15:09 2.000 14.2 -9.6 -1.6 52.5 0-255 q7833.jpg 01:45:08 2.000 21.1 -8.3 -0.6 135.7 0-255 q7838.jpg 02:00:07 1.000 24.4 -7.5 0.1 155.7 0-255 q7840.jpg m7840.jpg 02:15:05 0.500 27.8 -6.6 1.2 165.0 0-255 q7842.jpg m7842.jpg exp: Exposure time in seconds (200 ISO, f/2.8). 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).