Portal:Atmospheric Sciences:Portal Atmospheric Sciences 09/2006
From Wikipedia, the free encyclopedia
|
The Atmospheric Sciences Portal
|
|
September 2006
|
|
|
 Selected article
 A Brocken spectre, also called Brocken bow or mountain spectre, observed and described by Johann Esaias Silberschlag in 1780, is the apparently enormously magnified shadow of an observer cast, when the Sun is low, upon the upper surfaces of clouds that are below the mountain upon which he stands. The apparent magnification of size of the shadow is an optical illusion that occurs when the observer judges his shadow on relatively nearby clouds to be at the same distance as faraway land objects seen through gaps in the clouds. The phenomenon is often observed on mountain peaks but is recorded in literature with special reference to The Brocken, a peak in the Harz Mountains in Germany where the Brocken spectre sometimes produces spectacular effects. |
 Did you know ...
A stratocumulus cloud belongs to a class characterized by large dark, rounded masses, usually in groups, lines, or waves, the individual elements being larger than those in altocumuli, and the whole being at a lower altitude, usually below 2,400 m (8,000 ft). Weak convective currents create shallow cloud layers because of drier, stable air above preventing continued vertical development. |
 Meteorology and history
The Tower of the Winds, also called horologion (timepiece), is an octagonal Pentelic marble tower on the Roman agora in Athens. It was supposedly built by Andronicus of Cyrrhus around 50 BC, but according to other sources might have been constructed in the 2nd century BC before the rest of the forum. |
 Categories
Atmosphere - Atmospheric sciences - Climate - Climate change - Climate forcing - Climatologists - Climatology - Clouds - Earth sciences - Environmental science - Greenhouses gases - Hydrology - Lightnings - Meteorological instrumentation and equipment - Meteorologists - Meteorology - Noise pollution - Oceanography - Paleoclimatology - Precipitation - Space science - Storms - Tornadoes - Tropical cyclones - Weather - Weather events - Weather hazards - Weather satellites - Winds |
 Related Portals
|
 Picture of the month
|
|
Help to develop this portal. The major updates should appear every month. We develop this portal slightly differently from majority of portals by grouping all text in one page. |
|
