Bright night shining clouds, Helsinki, Viikinranta

A spectacular, albeit sometimes cloudy, night cloud play.

The first observation as early as 23.38, when the Sun is already at -7 degrees. The long sharp belts were already clearly visible from the northeast to the north. Snapshot on cell phone.

By midnight, the play was already clearly distinguished. The play was at its widest. Night clouds extended quite sharply from the northeast over the zenith (110 °) to the southwest. Around the zenith, of course, the night clouds were dim.

Until about 1 o'clock, the play was dominated by fairly bright sharp IIb belts, as well as a few vortex shapes in the low northeast.

At about 1 in the night cloud area pushed clouds that were ruining the play for follow-up. Namely, waves were also revealed between the clouds. At this point, the upper limit of the night clouds was only 40 degrees, the focus had shifted from the eastern early night.

Fortunately, by 2 o'clock the sky had clarified again. The play had changed from a belt-vortex type to a more complex one, where, in addition to belts and vortices, there were many cross-stripe-type wave groupings. The brightness approached the eye-catching but remained on the bright side (k = 4). The highest night clouds remain at 40 degrees, the area from northwest to east.

The color of the night clouds was white or bluish, with a low yellowish or even orange hue. Especially at a later stage.

at 11.40 p.m.
azimuths: 320-20
height: 5-20
forms: IIab
brightness: 1
colors: Va

at 0.10
azimuths: 230-40
height: 5-110
forms: I, IIab, III ?, IVc
brightness: 1-4
colors: VaS

at 1.15 p.m.
azimuths: 300-70
height: 2-40
forms: I, IIab, IIIb, IVc
brightness: 1-3
colors: SKO

at 2 p.m.
azimuths: 300-80
height: 2-40
forms: I, IIab, IIIb, IVc, P
brightness: 1-4
colors: SVaKO

This description has been automatically translated from Finnish. Click here to see the original text.

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Bright night shining clouds - 25.7.2018 at 23.38 - 26.7.2018 at 02.05 Helsinki, Viikinranta Observation number 80138