David's Astronomy Pages (All Sky Camera) Aurora on night 2025-04-02 / 2025-04-03

Aurora 2025-04-01

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Aurora 2025-04-03

Aurora

Notes

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

- Auroral activity on the night 2025-04-02 / 2025-04-03 associated with period of geomagnetic activity up to KP3 Skies in NE Scotland were generally clear all-night. Activity was visible on camera images from around 20:25-03:30 UT (21:25 - 04:30 LT), with peaks at around 21:00 UT (22:00 LT) and again around 00:10-00:30 UT (01:10-01:30 LT) Observed activity comprised green aurora arc, curtains and waves with occasional pink, violet & crimson aurora, with rays up to 15-18° altitude.  The aurora display was recorded using the Observatory's new Tapo C325WB Colour Night Vision Camera, with images processed in real time by a new AstroColorCam program built for handing the frames captured by iSpy. Images and video below compare colour images captured by the new Camera, with the black/white images captured using the existing AllSky Camera at approximately the same time.   -  Scandinavian magnetometers recorded activity between 18:00 - 04:30 UT, with peaks in activity at 19:55-20:30 UT & 23:30-01:00 UT Lerwick Magnetometer shows activity up to K3.     - Telescope Images from 2025-04-02 >> -

Night Summary (Keogram) Plot

Night Summary Plot - North Sky (2025-04-02 / 2025-04-03) Times on plot are local times (GMT  = UTC +00h ) Aurora Activity visible on colour keogram at 21:30- 00:00 BST (20:30-23:00 UT, v.weak), 00:45 - 01:05 BST (23:45-00:05 UT), 01:30 - 05:00 BST (00:30-04:00 UT) with peak at 01:30 - 02:20 BST (00:30-01:20 UT)

Night Summary Plot - North Sky (2025-04-02 / 2025-04-03) Times on plot are local times (GMT  = UTC +00h ) Aurora visible on b/w keogram at  01:30 - 05:00 BST (00:30-04:00 UT) with peak at 02:05 - 02:15 BST (01:05-02:15 UT)

Scandinavia Magnetometers vs NorthCam Keogram - 2025-04-02 / 2025-04-03

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Pictures (AllSky Camera)

Panoramic View - Northern Sky

2025-04-02 20:26 UT (21:26 LT) Faint green aurora arc emerging from twilight sky, red sunset coolour in N-NNW direction

2025-04-02 20:29 UT (21:29 LT) Auroral Curtains and rays in N, NNE,NE direction

2025-04-02 20:42 UT (21:42 LT) Aurora arc climbing to 6-7°altitude. overlain by violet auroral glow, crimson rays in NNE direction.

2025-04-02 20:56 UT (21:56 LT) Auroral arc dimming, but curtain developing, with violet coloured rays to 20-25°altitude, most prominant in N-NNE directions. Moon appearing into view (26% phase, 32°altitude)

2025-04-02 20:59 UT (21:59 LT) Lovely violot & crimson rays in northern sky in NNW to NNE direction

2025-04-02 21:00 UT (22:00 LT) Continuing auroral activity, bright pink violet & crimson rays to 25°altitude

2025-04-02 21:02 UT (22:02 LT)  Auroral rays fading slightly and becoming more diffuse.

2025-04-02 21:10 UT (22:10 LT)  Aurora fading

2025-04-02 22:02 UT (23:02 LT) Slight brightening in auroral arc..

2025-04-02 22:41 UT (23:41 LT) Continued brightening in auroral arc. Arc now cimbed to 7° altitude. Moon in WNW sky (27% phase, 19° altitude)

2025-04-03 00:10 UT (01:10 LT) Increased aurora activity, bright green aurora along northern horizon, beginning to move in waves . Moon in NW Sky (28% phase, 8° altitude)

2025-04-03 00:24 UT (01:24 LT) Increased aurora activity, bright green aurora along northern horizon, beginning to move in waves . Moon in NW Sky (28% phase, 8° altitude)

2025-04-03 00:42 UT (01:42 LT) Aurora waves moving eastwards. Distinct ray in NNW direction

2025-04-03 01:24 UT (02:24 LT)  Auroral arc.  Moon beginning to set (28% phase, 2.4° altitude)

2025-04-03 01:38 UT (02:38 LT)  Continuing activity, with further wave of aurora moving eastwards. Rays to 15° altitude. Moon setting (28% phase, 1° altitude)

2025-04-03 02:08 UT (03:08 LT)  Green aurora wave, violet coloured ray in NNE sky to 15-18° altitude.

2025-04-03 02:47 UT (03:47 LT)  Slight banding in aurora, crismon-violet rays in NNE direction

2025-04-03 03:18 UT (04:18 LT)  Aurora activity fading, but continues on until wlight sky brightens

2025-04-03 03:51 UT (04:51 LT)  Twiglight sky developing. Aurora display lost in the twilight sky.

15s frames taken with Tapo C325WB Colour Camera vs 30s wider-field 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 - 2025-04-02 / 2025-04-03 Activity between 18:00 - 04:30 UT, with peaks in activity at 19:55-20:30 UT & 23:30-01:00 UT 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)

Graphed using 'make your own graph' facilities at  https://flux.phys.uit.no/compose/   (Tromsø Geophysical Observatory  ) Original data from Tromsø Geophysical Observatory (TGO), DTU Space (Technical University of Denmark) and Finnish Meteorological Institute (FMI) Data also displayed on SpaceWeatherLive's Europe Stackplot at  http://www.spaceweatherlive.com/en/auroral-activity/magnetometers).

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Planetary K-Index Plot (for reference)

Estimated 3 hour Planetary K-Index (NOAA)  (from http://services.swpc.noaa.gov) Planetary-k-index_2025-04-02 / 2025-04-03 Not captured

SAMNET's magnetometer at Sumburgh, Shetland  (Chart Explanation)  - Geomagnetic activity on the night 2025-04-02 / 2025-04-03 Plot shows elevated activity at 20:00 - 21:00 UT & 00:00 - 01:00 UT

8-day Lerwick Observatory K Index Showing max K3 on the night 2025-04-02 / 2025-04-03

Planetary K-Index and other information (Space Weather Prediction Centre) shows maximum Kp3.5 during the night 2025-04-02 / 2025-04-03  Note that the solar proton S1/S2 storm on 2025-04-01 has now subsided.

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Aurora Forecast, NOAA/Ovation (for reference)

Aurora Forecast for 2025-04-02 21:52 UT (GMT) (From Space Weather Prediction Centre,  http://www.swpc.noaa.gov )

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