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Backward Sunspots

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17 years 8 months ago #32300 by albertw
Backward Sunspots was created by albertw
From todays APOD

Why is sunspot 905 backwards? Perhaps it is a key marker for the beginning of a new magnetic cycle on our Sun. Every 11 years, our Sun goes through a magnetic cycle, at the end of which its overall magnetic orientation is reversed. An 11-year solar cycle has been observed for hundreds of years by noting peaks and valleys in the average number of sunspots. Just now, the Sun is near Solar Minimum, and likely to start a long progression toward the most active time, called Solar Maximum, in about 5.5 years. An indicator that the sun's magnetic field is reversing is the appearance of sunspots with the reverse magnetic polarity than normal. A few weeks ago, one small candidate reverse sunspot was sited but faded quickly. Now, however, a larger sunspot with negative polarity is being tracked. This sunspot, numbered 905, appears as the unusual white spot in the above magnetic image of the Sun taken with the SOHO spacecraft a few days ago. In the past few days, Sunspot 905 has actually begun to break apart and might also become the source of coronal mass ejections and explosive solar flares. Solar astronomers predict that the coming Solar Maximum will be unusually active.

Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/

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17 years 8 months ago #32361 by SunCrazy
Replied by SunCrazy on topic Re: Backward Sunspots
There is a very good NASA link that explains a lot about the solar cycle:

solarscience.msfc.nasa.gov/SunspotCycle.shtml

Here it also shows a Butterfly Diagram that shows how the spots move during the cycle.

Good to hear that the next maximum is gonna be an active one. Better start cooling down the CCD chip :D

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