Terneuzen midsummer night with exceptional noctilucent clouds, 13 minutes earlier   8188
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1 Jupiter
2 Antares
3 Waterfront, 3 km
4 Terneuzen center, 3.2 km
5 Dow Benelux, 6-7 km
6 Breskens, 22.1 km
7 Mouth of the river Scheldt, 25 km
8 Vlissingen city, 23.7 km
9 Borssele nuclear power plant, 14.8 km
10 Telecom tower Goes, 18.4 km
11 Hansweert, 14.4 km
12 Griete, 0.7 km
13 Doel cooling towers nuclear plant, 26.9 km


Location: Terneuzen on the dike at the cannon near Griete (12 m)      by: Mentor Depret
Area: Netherlands      Date: 2019 06 21 11:43 PMst
I made several NLC's pano's that night and I would like to show this one too which was shot 13 minutes before my previous pano (25740) but with different photometric settings. If you compare with previous pano, only 13 minutes earlier result in about the same darkness but quite a lot more NLC's much higher in the sky. I measured the NLC's light to obtain the best fine detail, this at the expense of stars and less color in the Terneuzen night skyline. I would like everyone to compare with Winfried Borlinghaus NLC's (pano 25733) too, which was taken at about the same time but accoding to his data 180 km to the south. Our observations prove we saw nearly exactly the same thing although here in Terneuzen a bit higher in the sky!

Canon Eos M6 with EF-M 11-22mm, 15 P RAW, 19mm (30.4 mm KB), iso 400, f 6.3, 1.3 s, 5300°K, PTGuiPro, 28562x3514 404MB TIFF, downsized>1750>1000>500 TIFF>sharpening 4064x500 923KB JPEG


Dramatic and instructive at the same time. Cheers, Martin
2019/06/25 20:57 , Martin Kraus
An astonishing atmospheric phenomenon 
Your pano and the Winfried's one are really exciting. On june 21th noctilucent clouds were seen rather everywhere in Europe, and even in Italy (much more southernmost than you).

Ciao, Alvise
2019/06/26 10:53 , Alvise Bonaldo
Qualitativ besser als dein zuvor präsentiertes Bild.
2019/06/26 11:37 , Dieter Leimkötter
Da in diesem Panoramabild die NLC's vom 21.6.2019 besoders gut gezeigt werden und da von seinem Autor, wie man es schon früher von ihm gewohnt war, auch sehr fundierte Angaben zur Fototechnik und den Bildern gemacht werden, fand ich, daß ich hier einen weiteren Versuch wagen könnte, zu ermitteln, über welchem Gebiet sich nördlich vom Aufnahmestandpunkt die zu sehenden NLC's gebildet haben könnten.
Dabei bin ich folgendermaßen vorgegangen: Aus der KB-Brennweite ergibt sich für die Einzelbilder ein Höhenwinkel von 40° und aus der Pixelhöhe des Original-Panoramas, daß dieser dort durch Beschnitt nur noch 35° beträgt. Wenn man ins Bild die Horizontlinie in Deichhöhe einträgt, dann ergibt sich für den Abstand zum oberen Rand der NLC's ein Höhenwinkel von 17,8° und den zum unteren Rand von 1,9°. Aus diesen Höhenwinkeln läßt sich für die in 82,5 km Höhe befindlichen NLC's bei Zugrundelegung der Erdkrümmung errechnen, daß sie sich in einer Entfernung von 240 km bis 840 km befunden haben mußten. Das bedeutet für das Zentrum der NLC's mit dem Richtungswinkel von 355°, das sie sich in der Mitte der Nordsee von 53,5° nB, das ist die Breite der nordfriesischen Inseln, bis zu 58,9° nB, das ist ca. die Breite von Stavanger in Südnorwegen, erstreckt haben. Aus den Richtungswinkeln 315° = NW und 45° = NO zwischen denen die abgebildeten NLC's liegen, ergibt sich, daß sie sich bei ihrer mittleren Entfernung von O nach W über die gesamte Nordsee von der englischen Küste bei Newcastle upn Tyne bis weit über Schleswig-Holstein erstreckt haben mußten. Insgesamt kann man also sagen, das die im Panorama zu sehenden NLC's über dem gesamten Bereich der Nordsee von W nach O und fast den fesamten von S nach N erstreckt haben mußten.
2019/07/01 13:51 , Heinz Höra
thx for the comments guys and especially thx to Heinz who made a very interesting photographic analysis where these NLC's were located!
To check the area and the farthest distance of the NLC's ( these just above the horizon), I made a pano with UDeuschle in northern direction from 315° to 45° and with my camera at an elevation of 80000 m above the dike. Although the program limits the max range of sight to 750 km, it calculated the farthest point at 753 km in Norway. At left on the horizon, we have the Scotland heights and on the right Southern Norway. So yes Heinz is right, the farthest NLC's on the pano are 600-800 km away and given the orientation, they covered the whole North Sea. I will post another interesting NLC's observation soon, shot at 1:10 our time (23u10 UTC), so when the sun is near deepest behind the horizon.

UDeuschle test pano:
2019/07/01 23:38 , Mentor Depret
Thank you, mentor, for your recognition of my calculations and the constructive dialogue.
I find your proposal to use UDeuschle for a view from 80 km above sea level very interesting. But one should not do this with the coordinates of terneuzen, but from the edges of the visible NLC's over the North Sea calculated by me. The UDeuschle views determined in this way then reflect the area on earth from which one would have to be visible these edges of the NLC's.

Here are the links to the UDeuschle views determined in this way:



The fact that practically usable views can be generated with such extreme values testifies to how forward-looking Dr. Deuschle programmed his tool.
2019/07/02 19:02 , Heinz Höra
Heinz, because the UDeuschle program limits the distance to 750 km, I thought it wouldn't work but yes it does. It is an incredible strong pano simulation tool. But from the 80 km Terneuzen height and with the NLC's angle (315°-45°) seen on my pano, it shows immediately the covered area, which indeed coincides with the whole North Sea.
2019/07/02 22:20 , Mentor Depret
Mentor, the visibility at UDeuschle is not limited to 750 km. In my examples I had set 900 km and if you look at the designated points in the calculated view, they are also those with up to 900 km distance.

However, I would like to point out once again that the observation points I have selected in their examples at an altitude of 82.5 km show exactly the southward area on earth from which one should be able to see this part of the NLC. In the conjective, it should be noted, then also the angular areas and those they can be seen and under which they are made to glow by the sun, must be observed. However, UDeuschle also provides a help for this, because at the abscissa the elevation angles for the places or areas on the earth are indicated.
2019/07/03 12:43 , Heinz Höra

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