Astronomy Picture of the Day - Solar Cycle


	Astronomy Picture of the Day - Solar Cycle

tfarrow

12-3-2007 10:57 AM

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astronomy, nasa, solar system, space, ham radio

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/c8b7500d-de03-4a91-9097-bb54c3425184/BE12B68A-F0FA-426D-8D6F-6150201890CE/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://antwrp.gsfc.nasa.gov/apod/astropix.html" href="http://antwrp.gsfc.nasa.gov/apod/astropix.html" style="font-size: 11px;">antwrp.gsfc.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/antwrp.gsfc.nasa.gov/img/A505BE11-9A97-4D71-942C-9603CFA6071A" alt="See Explanation.  Clicking on the picture will download
 the highest resolution version available." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><CENTER>
<B> A Complete Solar Cycle from SOHO </B> 
<B> Credit: </B>
<A href="http://sohowww.nascom.nasa.gov/">SOHO</A> -
<A href="http://umbra.nascom.nasa.gov/eit/">EIT Consortium</A>,
<A href="http://www.esa.int/">ESA</A>,
<A href="http://www.nasa.gov/">NASA</A>
</CENTER></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><P>
<B> Explanation: </B>
Every eleven years, our Sun goes through a solar cycle.
A complete
<A href="http://en.wikipedia.org/wiki/Solar_cycle">solar cycle</A>
has now been imaged by the sun-orbiting
<A href="http://sohowww.nascom.nasa.gov/about/about.html">SOHO
spacecraft</A>,
celebrating the 12th anniversary of its launch yesterday.
A <A href="http://solarscience.msfc.nasa.gov/SunspotCycle.shtml">solar
cycle</A>
is caused by the changing
<A href="http://solar.physics.montana.edu/YPOP/Spotlight/Magnetic/what.html">magnetic field</A> of the Sun, and varies from
<A href="http://en.wikipedia.org/wiki/Solar_maximum">solar maximum</A>,
when
<A href="http://antwrp.gsfc.nasa.gov/apod/ap051106.html">sunspot</A>,
<A href="http://antwrp.gsfc.nasa.gov/apod/ap070206.html">coronal mass ejection</A>, and
<A href="http://antwrp.gsfc.nasa.gov/apod/ap071106.html">flare phenomena</A> are most frequent,
to solar minimum, when such activity is relatively infrequent.
Solar minimums occurred in 1996 and 2007, while the last solar maximum
occurred in 2001
Pictured above is a SOHO image of the
<A href="http://antwrp.gsfc.nasa.gov/apod/ap060807.html">Sun</A> in extreme
<A href="http://science.hq.nasa.gov/kids/imagers/ems/uv.html">ultraviolet light</A> for each year of the last
<A href="http://en.wikipedia.org/wiki/List_of_solar_cycles">solar
cycle</A>,
with images picked to illustrate the relative
<A href="http://antwrp.gsfc.nasa.gov/apod/ap031029.html">activity</A> of the Sun.
</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/BE12B68A-F0FA-426D-8D6F-6150201890CE/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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