![]() ![]() Coronas usually occur in the presence of thin clouds, but a particular type, known as the Bishop's ring corona, occurs in the absence of clouds. In a corona the reddish tones are at the outer part of the rings. ![]() One or more diffuse concentric rings of light around the Sun or Moon, formed by diffraction of light as it moves through water droplets in the atmosphere the rings may have more color than halos. Halos are large - in the most common halo, the angle between the centre and the ring is 22 degrees (approximately the angle defined by the span of a hand at arm's length, as in this example), but other even larger halos are also possible.Ĭorona (diffraction ring around the Sun or Moon, not the corona composed of plasma surrounding the Sun) If colors are present the reddish tones are at the inner part of the rings. The term for various circles or arcs of light around the sun or Moon, caused by reflection and refraction of light as it moves through ice crystals in the atmosphere. The following phenomena fall under part 1 of the above definition, and philatelic items referring to them are included in this page. The interaction of charged particles from the sun (the solar wind) with certain atmospheric gases.Ītmospheric Optical Phenomena included in this page:.The interaction of light from the Sun or the Moon with certain components of the atmosphere (cloud water droplets or ice crystals, liquid or solid precipitation, dust, water vapour and the gases of the atmosphere itself) or with certain atmospheric structures (such as the vertical distribution of temperature and/or humidity) or.We define atmospheric optical phenomena to be the visual results of: If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.Ītmospheric Optical Phenomena: Definition Catalog numbers, years of issue, and notes on the items featured are given when available. ![]() (except Rainbows and Auroras) halo Sun pillarīelow is a checklist of Atmospheric optical phenomena (except Rainbows and Auroras) on postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.). Atmospheric Optical Phenomena (except Rainbows and Auroras) Atmospheric Optical Phenomena ![]()
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