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Keyword: Sun
![Праздник солнцестояния](https://images.astronet.ru/pubd/2002/12/21/0001181377/sun3col_thompsoneit.preview.jpg)
21.12.2002
Aloha and Season's greetings! On December 22nd, at 01:14 Universal Time (December 21, 3:14pm Hawaii-Aleutian Standard Time), the Sun reaches its southernmost point in planet Earth's sky marking the final season change for the year 2002. In celebration, consider this delightfully detailed, brightly colored image of the active Sun.
![Сигмоидальные кривые предвещают вспышки](https://images.astronet.ru/pubd/2005/07/22/0001207338/scme_yohkoh_big.preview.gif)
16.03.1999
On the Sun, S marks the spot. Solar explosions have been discovered to explode preferentially from regions marked with this letter. The surface of the quiet Sun is a maze of hot gas and flowing magnetic fields. When two regions of high magnetic field strength approach each other, they typically pass uneventfully.
![Спикулы: потоки на Солнце](https://images.astronet.ru/pubd/2008/11/02/0001231621/spicules_sst.preview.jpg)
2.11.2008
Imagine a pipe as wide as a state and as long as half the Earth. Now imagine that this pipe is filled with hot gas moving 50,000 kilometers per hour. Further imagine that this pipe is not made of metal but a transparent magnetic field.
![Ударные волны на Солнце](https://images.astronet.ru/pubd/2005/10/12/0001208527/moreton_halpha_eit.preview.jpg)
30.04.1999
On September 24, 1997 a shock wave blasted across the surface of the sun at speeds of 250 to 600 kilometers per second. On planet Earth, observer Barry Reynolds photographed the expanding shock front (left) in the light emitted by hydrogen atoms at the solar surface.
![Сёрфинг на Солнце](https://images.astronet.ru/pubd/2006/11/14/0001217828/eclipse91_ncar_big.preview.jpg)
16.07.1999
The sun's corona is a tenuous outer atmosphere composed of streams of energetic charged particles, but it is only easily seen from Earth during a total solar eclipse. For example, this 1991 image of totality from atop Mauna Kea, Hawaii forms a fleeting snapshot of the mysterious corona's beautiful, intricate structures and streams.
![Дыра в Солнце](https://images.astronet.ru/pubd/2007/09/27/0001223619/284hole_soho720.preview.jpg)
27.09.2007
The dark expanse below the equator of the Sun is a coronal hole -- a low density region extending above the surface where the solar magnetic field opens freely into interplanetary space. Shown in false color, the picture was recorded on September 19th in extreme ultraviolet light by the EIT instrument onboard the space-based SOHO observatory.
![Железное Солнце](https://images.astronet.ru/pubd/2004/10/09/0001199925/feii_eit010922_1812.preview.jpg)
29.09.2001
The ultraviolet light emitted by eleven times ionized iron at temperatures over 2 million degrees Farenheit was used to record the above picture of the Sun on September 22, the date of the autumnal equinox.
![Аналемма над Нью-Джерси](https://images.astronet.ru/pubd/2007/12/04/0001224931/analemma_matheson.preview.jpg)
4.12.2007
An analemma is that figure-8 curve that you get when you mark the position of the Sun at the same time each day throughout planet Earth's year. Above, 26 separate exposures were recorded to illustrate the regular solar motion -- a difficult project performed mostly during the calendar year 2006.
![В погоне за пятнами](https://images.astronet.ru/pubd/2006/11/12/0001217679/sunspots_mdi_big.preview.gif)
21.10.1999
The Sun rotates on its axis about once every 27 days. How can you tell? Just follow the sunspots. This composite picture was constructed from solar images recorded daily by the MDI instrument on board the space-based SOlar and Heliospheric Observatory (SOHO).
![Солнце в перигелие](https://images.astronet.ru/pubd/2004/08/16/0001199275/jan8_sxt_big.preview.gif)
11.01.1999
The Earth's orbit is not a perfect, sun-centered circle. At aphelion, the most distant point in Earth's orbit, the Sun is 150 million kilometers away and at perihelion, the closest point, Earth approaches the Sun to within about 147 million kilometers. While aphelion occurs in July, perihelion for planet Earth comes in January.
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