Solstice June 2018

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The June solstice is the Summer Solstice in the Northern Hemisphere and the Winter Solstice in the Southern Hemisphere. It took place at 10:07 UTC on 21 June.

Solstice June 2018
suDate & Time
19 June 2018 02:00–08:00 UTC and 21 June 10:00 UTC
Meteosat-11, GOES-16
Natural Colour, Cloud Type

By Jose Prieto and Vesa Nietosvaara (EUMETSAT)

Solstice means the shortest night of the year in the northern hemisphere. In fact, above 66.6° latitude, there is no night at all. On 21 June 2018 the solstice took place at 10.07 UTC (Figure 1, top right, click to expand)

In the ABI Cloud Type animation for 19 June from 02:00 to 08:00 UTC (Figure 2), corresponding to midnight in North America, the Sun obliquely shines from the other side of the Earth and reflects almost flat into the GOES-16 solar sensors.

Figure 2: GOES-16 Cloud Type RGB, 19 June 02:00–08:00 UTC

Usually, the most reflecting parts are non-frozen portions of the ocean, but there seems to be little chance for that after the cold winter. The strongest reflection is circled in black and corresponds to cloud covered pixels, usually stratus made of reflective water droplets. The sunglint area moves from west to east, corresponding to the Sun moving east to west on the other side.

Figure 3
Figure 3: Canadian sea ice concentration map, 20 June. Credit: CIS.

The chart on ice extent from the government of Canada (Figure 3) gives a view for 20 June of the few ice-free areas inside the image, not affected by sunglint in this example.

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