Brightness distribution at lambda equals 3 and 21 CM near the solar north pole

Astronomy and Astrophysics – Astronomy

Scientific paper

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Brightness Temperature, Microwave Emission, Solar Corona, Solar Limb, Solar Radio Emission, H Alpha Line, Radio Astronomy, Solar Eclipses, Solar X-Rays

Scientific paper

The brightness distribution of the sun near the north pole at lambda equals 3 and 21 cm is obtained using the results of the partial eclipse of February 25, 1971. The solution obtained by expanding the brightness distribution in orthogonal polynomials does not show any brightening at either frequency, but a sensible darkening. If this result is explained by the presence of spicules, the coronal emission must be negligible with respect to the emission coming from the transition region. This is possible, at lambda equals 21 cm, only if we assume the presence of a coronal hole near the pole.

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