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Solar phenomena are natural phenomena which occur within the atmosphere of the Sun. They take many forms, including solar wind , radio wave flux , solar flares , coronal mass ejections , [ 1 ] coronal heating and sunspots .
S. Solar energetic particles; Solar facula; Solar flare; Solar granule; Solar irradiance; Solar jet; Solar maximum; Solar minimum; Solar observation; Solar particle event
Post-eruptive loops in the wake of a solar flare, image taken by the TRACE satellite (photo by NASA). In solar physics, a solar particle event (SPE), also known as a solar energetic particle event or solar radiation storm, [a] [1] is a solar phenomenon which occurs when particles emitted by the Sun, mostly protons, become accelerated either in the Sun's atmosphere during a solar flare or in ...
The phenomena [sic] of false suns which sometimes attend or dog the true when seen through the mist (parhelions). In Norfolk a sun-dog is a light spot near the sun, and water-dogs are the light watery clouds; dog here is no doubt the same word as dag, dew or mist as "a little dag of rain" (Philolog. Soc. Trans. 1855, p. 80). Cf. Icel.
A solar flare is a relatively intense, localized emission of electromagnetic radiation in the Sun's atmosphere. Flares occur in active regions and are often, but not always, accompanied by coronal mass ejections, solar particle events, and other eruptive solar phenomena. The occurrence of solar flares varies with the 11-year solar cycle.
The finding that solar activity was approximately the same in cycles 14 and 24 applies to all solar outputs that have, in the past, been proposed as a potential cause of terrestrial climate change and includes total solar irradiance, cosmic ray fluxes, spectral UV irradiance, solar wind speed and/or density, heliospheric magnetic field and its ...
Systematically observing the sunrise, people discovered that it occurs between two extreme locations at the horizon and eventually noted the midpoint between the two. Later it was realized that this happens on a day when the duration of the day and the night are practically equal and the word "equinox" comes from Latin aequus, meaning "equal", and nox, meaning "night".
List of solar storms; Aurora, a luminous phenomenon induced by ionization and excitation of constituents of a planet's upper atmosphere; Heliophysics, the scientific study of the Sun and region of space affected by the Sun; Magnetic cloud, a transient disturbance in the solar wind; Solar cycle, an 11-year cycle of sunspot activity