Friday, September 24, 2010

APOD 1.4

September 23, 2010. Equinox and The Iron Sun.


This is a picture of the sun during the equinox, or the time as the sun crosses over the celestial equator.  Twice a year, the sun crosses the celestial equator causing equinoxes and changing the seasons to fall and spring.  Another two times throughout the year, this will occur causing solstices which bring the seasons into summer and winter. The literal meaning of the word equinox is actual equal night, because during the days that this phenomenon occurs, both day and night last for nearly 12 hours.  However, this lasts only for one day as days begin to grow shorter while the sun rises lower and lower in the sky as winter approaches. This picture is taken using ultraviolet light and is characterized by a false yellowish color due to ionized iron atoms. The swivels in the sun are fields of plasma suspended in magnetic fields above solar active regions.

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