Explanation: As the Sun heads South, crossing the celestial equator today at 1:37 a.m. Eastern Time, Autumn begins for Earth's Northern Hemisphere. This Autumnal Equinox finds an increasingly active Sun steadily approaching a solar cycle maximum expected around the year 2003. The solar activity cycle is driven by a periodic winding up of the Sun's internal magnetic field. This colorized picture is a mosaic of recent ultraviolet images from the orbiting TRACE satellite sensitive to light emitted by highly charged iron atoms. Growing in number, the intricate structures visible are the Sun's hot active regions with temperatures over a million degrees Fahrenheit and their associated magnetic loops.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: Sun - equinox - solar cycle - Solnechnaya aktivnost' - solnechnyi cikl - Ravnodenstvie - osennee ravnodenstvie - magnitnoe pole Solnca - Ul'trafioletovoe izluchenie Publikacii so slovami: Sun - equinox - solar cycle - Solnechnaya aktivnost' - solnechnyi cikl - Ravnodenstvie - osennee ravnodenstvie - magnitnoe pole Solnca - Ul'trafioletovoe izluchenie
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