A) i and ii only
B) i and iii only
C) iii only
D) i, ii and iii
Correct Answer: B
Solution :
[b] Sun-spots: Sunspots in the photosphere (sun's surface) are areas with strong magnetic field that are cooler, and thus darker, than the surrounding region. Sun throws hot material towards photosphere and these results in sun-spots. These are transient dark marking on the visible surface of the sun caused by a relatively cooler area between \[5{}^\circ \] and \[35{}^\circ \] North or South of the equator of the Sun. Temperature of sunspots is \[20000{}^\circ \] lower than the surrounding photosphere. Sun-spots indicates volatility of sun. Sun-spots maxima and minima occur periodically. Time-interval between two successive sun-spots maxima and minimum is 1 years. Solar-Flares: Powerful eruptions or radiations around the sun or associated with the sun-spots. This occurs in the chromospheres of the sun. Solar-flares emit intense short-wave radiation. That intersects with the ionosphere of the earth. This may result in temporary period and appearance of brilliant display of Aurora, at the higher latitudes of the earth closer to Arctic Circle and Antarctic Circles. Aurora is seen in the ionosphere of the earth. Aurora is seen more frequently during sun-spots maximum period.
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