David's Astronomy Pages (All Sky Camera) Aurora on night 2023-04-21

Contrail  2023-03-27

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Aurora 2023-04-23

Aurora

Notes

Night Summary (Keogram) Plot Pictures Videos Magnetometer Stack Plots (for reference) Planetary K-Index Plot (for reference) Aurora Forecast, NOAA/Ovation (for reference)

- Weak aurora activity visible from NE Scotland on the night of 2023-04-21, beginning at 21:35 UT (shortly after dusk), with last activity at around 23:05 UT.  Cloud unfortunately hid the northern sky between 22:05 and 22:45 UT and again from 00:00 UT onwards. -  Scandinavia magnetometers indicate activity from 2023-04-21 19:00 UT to around 2023-04-22 01:00 UT, with peaks of activity at 19:30 UT &  22:00 - 23:00 UT      - KP Index 2 - 3     - Telescope Images from 2023-04-21 >>

Night Summary (Keogram) Plot

Night Summary Plot - North Sky (2023-04-21 / 2023-04-22 ) Times on plot are local times (BST  = UTC +01h ) Activity visible 22:45 - 23:00 LT (21:45 - 22:00 UT)

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Pictures

Panoramic View - Northern Sky

2023-04-21 21:42 UT (22:42 LT) Weak auroral arc in N sky to 6° altitude.  Some twilight sky in NW

2023-04-21 21:44 UT (22:44 LT) Auroral rays moving eastwards. Rays to 12° altitude

2023-04-21 21:48 UT (22:48 LT) Curtains developing along auroral arc. Rays to 15-20° altitude (moving eastwards)

2023-04-21 21:55 UT (22:55 LT) Curtains developing along auroral arc. Rays to 15° altitude.

2023-04-21 21:56 UT (22:56 LT) Ray in N sky reaching to 25° altitude. Foreground cloud along northern horizon

2023-04-21 21:58 UT (22:58 LT) Brightening in aurora just west of N. Rays to 15-17° altitude. Clouds approaching from north.

2023-04-21 22:01 UT (23:01 LT) Aurora activity gradually being hidden by cloud along northen horizon, but rays in NNW sky to 20° altitude

2023-04-21 22:08 UT (23:08) Clouds hide northern sky between 22:05 and 22:45 UT (ie 23:05 - 23:45 LT)

2023-04-21 23:00 UT (2023-04-22 00:00 LT) Weak aurora arc to 5° altiude. Satellite flash (?) in N sky at 32° altiude

2023-04-21 23:00 UT (2023-04-22 23:02 LT) Weak auroral arc and faint rays

30s exposures taken with Oculus All Sky Camera

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 Videos

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Magnetometer Stack Plots (for reference)

Magnetometer Stack Plots from Scandinavia (ordered by latitude) H Component - 2023-04-21 / 2023-04-22 Original data from Tromsø Geophysical Observatory (TGO), DTU Space (Technical University of Denmark) and Finnish Meteorological Institute (FMI, displayed on SpaceWeatherLive http://www.spaceweatherlive.com/en/auroral-activity/magnetometers). Note: Geomagnetometer activity at rvk (Rorvik, 64.95N), dob (Dombas, 62.07N), sol (Solund, 61.08N) and kar (Karmoy, 59.21N) stations are used as indicators for potential auroral activity that may be visible from my Observatory situated at latitude 57.32N  (Map of Stations)

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Planetary K-Index Plot (for reference)

Estimated 3 hour Planetary K-Index (NOAA) (K indices of 5 or greater indicate storm-level geomagnetic activity around earth)  (from http://services.swpc.noaa.gov) planetary-k-index_2023-04-21 / 2023-04-22 TBA

Planetary K-Index and other information (Space Weather Prediction Centre) shows KP Index reaching KP3 on 2023-04-21

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Aurora Forecast, NOAA/Ovation (for reference)

Aurora Forecast at 2023-04-23 for 23:57 UT (From Space Weather Prediction Centre,  http://www.swpc.noaa.gov )

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