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File:Neptune clouds.jpg

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Neptune_clouds.jpg (682 × 596 pixels, file size: 256 KB, MIME type: image/jpeg)

Summary

Description
English: This Voyager 2 high resolution color image, taken 2 hours before closest approach, provides obvious evidence of vertical relief in Neptune's bright cloud streaks.

These clouds were observed at a latitude of 29 degrees north near Neptune's east terminator. The linear cloud forms are stretched approximately along lines of constant latitude and the Sun is toward the lower left. The bright sides of the clouds which face the Sun are brighter than the surrounding cloud deck because they are more directly exposed to the sun. Shadows can be seen on the side opposite the sun. These shadows are less distinct at short wavelengths (violet filter) and more distinct at long wavelengths (orange filter). This can be understood if the underlying cloud deck on which the shadow is cast is at a relatively great depth, in which case scattering by molecules in the overlying atmosphere will diffuse light into the shadow.

Because molecules scatter blue light much more efficiently than red light, the shadows will be darkest at the longest (reddest) wavelengths, and will appear blue under white light illumination.

The resolution of this image is 11 kilometers (6.8 miles per pixel) and the range is only 157,000 kilometers (98,000 miles). The width of the cloud streaks range from 50 to 200 kilometers (31 to 124 miles), and their shadow widths range from 30 to 50 kilometers (18 to 31 miles). Cloud heights appear to be of the order of 50 kilometers (31 miles).
Deutsch: Dieses hochauflösende Farbbild von Voyager 2, das 2 Stunden vor der größten Annäherung an den Planeten aufgenommen wurde, zeigt auffällige Hinweise für das vertikal Relief in Neptuns hellen Wolkenstreifen.

Diese Wolken wurden auf einer Breite von 29° nordöstlich von Neptuns östlicher Begrenzung beobachtet. Die linearen Wolkenformen sind ungfähr entlang der Linien der nordsüdlichen Breite gestreckt und die Sonne befindet sich auf der unteren linken Seite. Die hellen Seiten der Wolken, die sich in Richtung der Sonne befinden, sind heller als die umgebende Wolkendeck, da sei von der Sonne angestrahlt werden. Schatten können an der Seite, die der Sonne abgewandt sind, gesehen werden. Diese Schatten sind bei kurzen Wellenlängen (violettes Filter) weniger deutlich und auffälliger bei längeren Wellenlängen (oranges Filter). Dies kann verstanden werden, wenn die darunterliegende Wolkendecke, auf denen die Wolken ihre Schatten werfen, sich relativ tief aufhalten. In diesem Fall zerstreuen Moleküle in der überlagernden Atmosphäre das Licht und die Schatten werden unschärfer.

Da Moleküle das blaue Licht effizienter als rotes Licht streuen, sind die Schatten bei den längeren (roten) Wellenlängen am dunkelsten und erscheinen bei heller Beleuchtung blau.

Die Auflösung diese Bildes beträgt 11 Kilometers pro Pixel und der Bereich ist nur 157.000 Kilometer. Die Breite der Wolkenstreifen umfasst 50 bis 200 Kilometer und die Breiten ihrer Schatten reichen von 30 bis 50 Kilometer. Die Höhe der Wolken erscheinen in der Größenordnung von 50 Kilometer zu liegen.
Date
Source http://photojournal.jpl.nasa.gov/catalog/PIA00058
Author NASA / Jet Propulsion Lab
Permission
(Reusing this file)
Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
Warnings:
This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA00058.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
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Captions

Cirrus clouds imaged above the gaseous atmosphere of Neptune
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Items portrayed in this file

depicts

Neptune

cirrus

File history

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Date/TimeThumbnailDimensionsUserComment
current13:33, 18 March 2006Thumbnail for version as of 13:33, 18 March 2006682 × 596 (256 KB)Fabio BettaniDate: 08.25.1989. This Voyager 2 high resolution color image, taken 2 hours before closest approach, provides obvious evidence of vertical relief in Neptune's bright cloud streaks. These clouds were observed at a latitude of 29 degrees north near Neptun

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