|[Note Guidelines] Photographer's Note|
|This is my first landscape-sunset-cloud-shot here on|
treknature - normally i prefer to see animals, but this
is nature too of course and i do not have many animals
to show at the moment.
As found this cloud formation very interesting looking
- unfortunately i do not know it´s name,
as every formation is somehow classified and named,
as i read in my "book about clouds" - i thought i will
share this with you for the weekend.
This was taken on an evening walk around the town
of Burtonport in County Donegal.
A cloud is a visible mass of condensed droplets, frozen
crystals suspended in the atmosphere above the surface
of the Earth or another planetary body, such as a
moon. (Clouds can also occur as masses of material in
interstellar space, where they are called interstellar
clouds and nebulae.) The branch of meteorology in which
clouds are studied is nephology.
On Earth the condensing substance is typically water
vapor, which forms small droplets or ice crystals,
typically 0.01 mm in diameter. When surrounded by
billions of other droplets or crystals they become
visible as clouds. Dense deep clouds exhibit a high
reflectance (70% to 95%) throughout the visible range
of wavelengths: they thus appear white, at least from
the top. Cloud droplets tend to scatter light
efficiently, so that the intensity of the solar
radiation decreases with depth into the cloud, hence
the gray or even sometimes dark appearance of the
clouds at their base. Thin clouds may appear to have
acquired the color of their environment or background,
and clouds illuminated by non-white light, such as
during sunrise or sunset, may be colored accordingly.
In the near-infrared range, clouds would appear darker
because the water that constitutes the cloud droplets
strongly absorbs solar radiation at those wavelengths.
Clouds are divided into two general categories: layered
and convective. These are named stratus clouds (or
stratiform, the Latin stratus means "layer") and
cumulus clouds (or cumuliform; cumulus means "piled
up"). These two cloud types are divided into four more
groups that distinguish the cloud's altitude. Clouds
are classified by the cloud base height, not the cloud
top. This system was proposed by Luke Howard in 1802 in
a presentation to the Askesian Society.
Examples: Cirrus (CI), Cirrostratus (Cs), Cirrocumulus
(Cc), Altostratus (As),Altocumulus (Ac), Stratus (St),
Nimbostratus (Ns), Cumulonimbus.
Kameramodell Canon EOS 400D DIGITAL
Aufnahmedatum/-zeit 14.08.2007 20:06:11
Aufnahmemodus P (Programmautomatik)
Tv (Verschlusszeit) 1/125
Av (Blendenzahl) 6.3
Filmempfindlichkeit (ISO) 400
Objektiv 18.0 - 250.0 mm
Brennweite 23.0 mm
AF-Betriebsart One-Shot AF
Dateigröße 2897 KB
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