The new solar cycle starts with a bang
A sunspot, discovered by SOHO, indicates the beginning of a new solar cycle.
Provided by ESA, Noordwijk, Netherlands
Published:
January 17, 2008 This image, obtained by the MDI imager on board SOHO, shows the sunspot that marked the beginning of the new solar cycle.
Photo by SOHO/MDI (ESA & NASA)
A very special solar spot on the Sun's surface appeared a few days ago. This solar spot, which produced two blasts, signaled to scientists around the world that a new solar cycle had begun.
Each solar cycle lasts an average of 11.1 years. The new solar cycle, called Cycle 24, started on January 4, when the Solar and Heliospheric Observatory (SOHO) observed an event scientists have been anticipating for about a year.
A fairly small and, at first sight, inconspicuous sunspot on the Sun's northern hemisphere showed a reversed magnetic polarity compared to sunspots of previous years. A sunspot is an area of highly organized magnetic activity on the surface of the Sun. This sunspot convinced scientists that a new solar cycle had begun. Later that day, this finding was made official when the sunspot was catalogued by the US National Oceanic and Atmospheric Administration (NOAA). |
 This image shows the area of the solar surface from which two EIT waves, a kind of solar storm that blasts out from an active region across a portion of the Sun’s surface, were originated.
Photo by SOHO/EIT (ESA & NASA) |