Noctilucent clouds

(Russian version)

Noctilucent clouds are clouds at extreme high altitude, 80-85 km. This part of atmosphere is called mesosphere. Unlike usual clouds they shine at night. It is a rare phenomenon and can be observed at latitudes 50^o-65^o during clear summer nights.

I saw this phenomenon only once, at night 07/08-AUG-1986 near abandoned village Shigola in Leningrad region of Soviet Union. Latitude 60^o29'42" +- 1", longitude 2^h21^m +- 1^m. I made three pictures using a photo camera FED-5, F/D=2.8, Orwochrom film with speed 45 GOST units. The camera was mounted on a tripod.

Exposition began at 1986.08.08_02:10 (GMT+04:00).
Exposition length: 3^m

Exposition began at 1986.08.08_02:14 (GMT+04:00).
Exposition length: 2^m

Exposition began at 1986.08.08_03:57 (GMT+04:00).
Exposition length: 1^{m
A spot at the top of the picture
is star alpha Aurigae (Capella). We can see beta Aurigae left and
below of alpha Aurigae. At the right low corner we see beta Taurus.}

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Last update: 06-SEP-2003 12:54:14

	Exposition began at 1986.08.08_02:10 (GMT+04:00). Exposition length: 3^m
	Exposition began at 1986.08.08_02:14 (GMT+04:00). Exposition length: 2^m
	Exposition began at 1986.08.08_03:57 (GMT+04:00). Exposition length: 1^{m A spot at the top of the picture is star alpha Aurigae (Capella). We can see beta Aurigae left and below of alpha Aurigae. At the right low corner we see beta Taurus.}