Welcome to Astronomy & Telescope Astronomy



· Home
· AvantGo
· Content
· Downloads
· Encyclopedia
· Feedback
· Forums
· Journal
· Members List
· Private Messages
· Recommend Us
· Reviews
· Search
· Statistics
· Stories Archive
· Submit News
· Surveys
· Top 10
· Topics
· Web Links
· Your Account

  Who's Online

There are currently, 7 guest(s) and 0 member(s) that are online.

You are Anonymous user. You can register for free by clicking here




Select Interface Language:


  Random Headlines

Double Star
[ Double Star ]

·Astronomy: Double Star - SPLITTING STARS
·Astronomy: Double Star - SEEING DOUBLE
·Astronomy: Double Star - POSITION ANGLE
·Astronomy: Double Star - OTHER TYPES
·Astronomy: Double Star - DOUBLE DEDICATION
·Astronomy: Double Star - OBSERVING DOUBLE STARS

  Sunlit Cloud: Astronomy: Sunlit Cloud
Posted on Friday, December 10 @ 18:55:26 CST by astronomy
  Sunlit Cloud


By day and by night, the interaction of sunlight and moisture in our atmosphere creates sights in the sky.

A sunlight passes through the ice crystals and water droplets suspended in the air above us, it creates an endless variety of arcs, rings, dapples of color, and splashes oflight that can be seen throughout the year.

Most of these phenomena occur within Earth's lower atmosphere, which means that they are actually meteorological in nature. Noctilucent clouds, however, can claim both meteorological and astronomical ties.

Noctilucent clouds appear at night—usually an hour or so after sunset, when the Sun is more than 10 degrees below the horizon. This phenomenon is known to appear around midsummer in both the Northern and Southern hemispheres, but it can only be seen between latitudes of 45 and 60 degrees, with most sightings occurring in Canada and northern Europe.

These silvery-blue clouds form at the edge of space at an altitude of 50 miles (80 km), which is almost five times higher than most of Earth's weather-making systems. At such heights, the temperature can dip to -150 degrees Fahrenheit (-100° C). The scant amount of water vapor present at this altitude condenses onto meteoric dust and charged particles in the atmosphere, forming the clouds.

Sightings of noctilucent clouds have doubled since the 1950s. A possible explanation is that industrial pollution has increased the amount of particles at high altitudes around which the clouds can form.




Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.

  Related Links

· More about Sunlit Cloud
· News by astronomy

Most read story about Sunlit Cloud:
Astronomy: Sunlit Cloud - Rainbow-OVER THE RAINBOW


  Article Rating

Average Score: 0
Votes: 0

Please take a second and vote for this article:

Very Good



 Printer Friendly Printer Friendly

 Send to a Friend Send to a Friend


Associated Topics

Sunlit Cloud

"Login" | Login/Create an Account | 0 comments
The comments are owned by the poster. We aren't responsible for their content.

No Comments Allowed for Anonymous, please register

  Astronomy & Telescope Astronomy

All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest © 2004 by Astronomy & Telescope Astronomy
You can syndicate our news using the file backend.php or ultramode.txt