Page 26 - Dream June 2020

ANNULAR S LAR ECLIPSE AT THE CORE
solar eclipse, when the Moon covers the photosphere, the chromosphere can be seen as a red rim around the Sun and the corona appears as a faint halo around the blackened Sun.
The temperature in the Sun does not vary in a regular manner. As we move towards the surface of the Sun from the core, the temperature decreases from 15,000,000°C to 3,727°C in the chromosphere. Thereafter the temperature rises again and reaches up to 1,800,000°C in the corona. The region between the chromosphere and corona, where the temperature rises again, is called the transition zone. The reason for this sudden increase in temperature is still a subject of investigation. Some researchers believe that the photosphere heats the corona from the non-thermal source of energy stored in its magnetic fields. This may involve two mechanisms: one is the current generated by the changing magnetic field and the other is magnetohydrodynamic waves.
The Sun occasionally shows dark spots on its surface called sunspots. These spots are not really dark but appear dark because they are cooler than the surroundings. Regions of the Sun near high magnetic fields get cooler as compared to the other areas. Therefore, they appear dark against the bright background giving the appearance of a spot. Every eleven
years, the sunspot activity reaches the maximum, and a large number of sunspots are noticed on the Sun’s surface. The magnetic field of the Sun and the nature of sunspots are not yet fully understood.
The hydrogen present in the Sun gets consumed every moment in the formation of helium. When the store of hydrogen gets exhausted, there will be no fusion and the Sun
Courtesy: Nasa.gov
In addition to light and heat, the Sun gives out electromagnetic radiation of other wavelengths. These wavelengths include radio waves, ultraviolet rays, high energy X-rays, etc. The Sun also emits streams of charged particles commonly known as solar wind.
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