Presentation on theme: "The Sun’s Magnetic Personality Assembled by Ken Mitchell Livermore TOPScience."— Presentation transcript:
The Sun’s Magnetic Personality Assembled by Ken Mitchell Livermore TOPScience
At the beginning of the cycle, the lines of magnetic force run north and south between the Sun's magnetic poles. This is the period of minimum magnetic activity called the "Solar Minimum.“ However, this condition does not last. The Sun's magnetic field changes all the time. In fact, the Sun has a cycle that repeats itself every 11 years. During that time the structure of the magnetic field changes dramatically.
Beneath the Convection Zone, the Radiation Zone spins as a sold mass. The different ways that these two zones move causes the Sun's magnetic field to stretch at the equator. As the Sun rotates, the Convection Zone spins faster at the equator than it does at the poles.
As the solar cycle continues, these lines of magnetic force continue to stretch. Like a rubber-band that's twisted too much, the magnetic field begin to buckle. Eventually, the magnetic force, which is generated beneath the Convection Zone, breaks the surface of the Sun.
When this happens, all sorts of strange activity occurs: 1. Sun spots form, 2. the Corona heats up, and 3. solar flares and loops erupt from the Sun's surface. These phenomena are like giant magnetic storms that not only alter the Sun's surface, but also eject powerful bursts of energy out into the Solar System. The peak of all this activity is called the "Solar Maximum." At these times, we on Earth can experience magnetic disturbances like disruptions in satellite communications and atmospheric events like the Aurora Borealis. Following the Solar Maximum, the magnetic field begins to unwind and activity on the Sun subsides. Gradually, the Sun returns to the Solar Minimum and the cycle begins again. The Sun reached a Solar Minimum around The next Solar Maximum should occur around 2012 to 2015.
Magnetic fields on the Sun
Yellow regions are occupied by south-pointing magnetic fields; blue denotes north. At mid-latitudes the diagram is dominated by intense magnetic fields above sunspots. The uniform blue and yellow regions near the poles reveal the orientation of the Sun's underlying dipole magnetic field.