... A more detailed (but qualitative) discussion of heat flow in the atmosphere and related weather processes, including the roles of buoyancy, convection and humidity. ... Heat makes it expand, it becomes less dense than the surrounding air and buoyant, and it rises like a hot-air balloon (or like a drop of oil in a bottle of water). ... The important thing to remember when dealing with convective flows, is that the higher one is in the atmosphere, the lower are the pressure and density of the air. ...

... High-velocity clouds (HVCs) were discovered by Muller, Oort & Raimond (1963) in the 21-cm line emission of neutral, atomic hydrogen. They are gas clouds which are characterised by high radial velocities incompatible with a participation in the rotation of our Galaxy. ... This suggestion was seized by Braun & Burton (1999) who identified 66 compact high-velocity clouds (CHVCs) with positional and kinematic characteristics being compatible with a distribution across the entire Local Group. ...

... Views of Martian Clouds . ... Although not as pronounced as on Earth , clouds are common features on Mars. The Martian atmosphere has only a trace of water vapor; however, the temperature and pressure is such that the atmosphere is usually close to saturation and produces clouds. Even from Earth based telescopes, clouds have been observed by transient brightening on the surface of Mars. ... Lee waves . ... Wave clouds . ... Image Credit: Calvin J. Hamilton) . Lee Wave . ... Wave Clouds . ...

... Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Galactic 130 less than 100 GB Magnetic Fields towards High-Latitude Molecular Clouds More than 100 molecular clouds detected in CO(1­0) emission are at high Galactic latitudes. ...

Astronomy Picture of the Day . ... 11.07.2009 . ... P-M Hed n ( Clear Skies , TWAN ) Explanation: Noctilucent or night-shining clouds lie near the edge of space . ... This impressive 360 degree panorama made from 34 separate images captures an impressive display of noctilucent clouds all over the sky. ... The photographer reports that the display was like a noctilucent cloud storm, one of the best he's ever witnessed . ... Publications with keywords: clouds . Publications with words: clouds . ...

... 2009 July 11 . Noctilucent Cloud Storm Panorama . ... Explanation: Noctilucent or night-shining clouds lie near the edge of space . ... This impressive 360 degree panorama made from 34 separate images captures an impressive display of noctilucent clouds all over the sky. ... The photographer reports that the display was like a noctilucent cloud storm, one of the best he's ever witnessed . ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

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The Sun is our nearest star and the source of energy for life on Earth. ... For centuries astronomers wondered whether they were clouds floating in the Sun's atmosphere, but we now know that they really are huge regions of magnetic field, about as intense as the field at the poles of an iron magnet. ... Such abrupt events were named solar flares , and what made them especially interesting was that occasionally, after a prominent flare, a magnetic storm would erupt on Earth. ...

... Although each chapter has its own set of links, this page offers the complete collection, with additional sites for those interested in general astronomy, amateur astronomy, professional astronomical institutions, and astronomy news. General Astronomy Links . Sky Telescope 's vast collection of astronomy sites . ... Space Telescope Science Institute . ... A page dedicated to sundial links across the Web . ... A page dedicated to sundial links . ... Overview of the moon . About the moon . ...

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... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Mars . ... Spacecraft detects aurora and mysterious dust cloud around Mars . Although the source and composition of the dust are unknown, there is no hazard to MAVEN and other spacecraft orbiting Mars. ... MARS | ... NASA s Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft has observed two unexpected phenomena in the martian atmosphere: an unexplained high-altitude dust cloud and aurora that reaches deep into the martian atmosphere. ...

Various types of stars have dust around them. In the well known case of the Pleiades the dust around the stars is unrelated to the stars, and is instead dust from an interstellar cloud that the Pleiades cluster has drifted into on its way through the galactic disk. ... The dust in interstellar space is observed in a variety of ways: due to its passive absorption of starlight ("extinction"), by its production of polarization in starlight, and then at long wavelengths due to its thermal radiation. ...

This tornado formed at 4:30pm during a severe thunderstorm and ran a path of over 5km towards the SE. It crossed the Oxley Highway near the end of its path where a car and a truck were forced to stop, becoming trapped by falling trees. ... Sat Jan 29. ... The tornado was around 300m wide on crossing the Oxley Hwy and was probably on the ground for around 5 minutes after a long buildup. ... The most obvious damage is on the Oxley Highway, 21km by road out of Coonabarabran and 85km from Gunnedah. ...

OREGON COUNTRY (Jinx Davis) Fall comes to Oregon , summer is gone Up on the mountain I'm watching the dawn Sippin' hot coffee and watchin' the breeze That rolls down the canyons and brings my mind ease Well it's Oregon country , the rain's comin ' down Water is soakin' the ground all around Inside there's a fire, good friends all around Oregon country , the rain's comin ' down It's autumn in ...

... The twilight zone is not just an old television series. ... Most places on Earth pass through the twilight zone twice a day; the result is an enchanting hour at dawn and dusk of low sunlight and long shadows. ... Before assigning your students to watch a sunrise or sunset, have them try the following activities to develop their global sense. ... Armed with a global sense of our spinning planet, go out to watch the sky as your part of the Earth moves through the twilight zone. ...

... The ancient chronical said about the colour rings around the Sun and the Moon, about three suns in the sky, light columns, bright lightning, different "comets" rushing to the Earth, moving among the stars or round the Earth with the sky. All these occurrences may be divided into three categories: one that occur in the near or far space, processes going on in the Earth atmosphere under the influence of cosmic factors and at last the occurrences connected with the Earth atmosphere. ... Rainbow . ...

... Search . ... Astrophysics Group . Research . ... Research and Instrumentation . ... While this seems an extraordinary endeavour, in light of what we have learnt about Solar System planets, only a handful of key ingredients are required to start characterising an exoplanet. ... The NGTS project is a partnership between the University of Cambridge, Queen?s University Belfast, University of Warwick, University of Leicester, Observatoire de Geneve, DLR (Berlin) and Universidad Catolica de Chile. ...

Journal of Atmospheric and Solar-Terrestrial Physics Manuscript Draft Manuscript Number: ATP1021 Title: comment on the paper by Dalin , Pertsev and Romejko Significance of lunar impact on noctilucent clouds ( revised version) Article Type: Research Paper Section/Category: Keywords: Noctilucent clouds moon influence mesosphere Manuscript Region of Origin: Abstract: a critical review of the paper by Dalin , ... Reference: Dalin, P.A., N.N. Pertsev, V.A. Romejko. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... These noctilucent "night-shining" clouds (or NLCs) are believed to form by sunlight reflecting off ice crystals high in the atmosphere, and usually appear in the northwest to northeast. ... NLCs occur at very high altitudes, in excess of 50 miles high, in the region above the stratosphere known as the mesosphere and at first sight they look like cirrus clouds. ... Noctilucent Clouds, July 2006 . ... NLCs from Space . ...

The Astronomy Net . Articles | AstroGuide | ... Forums . ... The Astronomy Net has been around a long time in Internet years. ... In 1995, the domain astronomy.net was secured. Read more about the history in the 'history' section. History . Contact Information . Ways to support Astronomy Net . ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | Contact Comments | ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...