A New Instrument for Observing the Electron Corona.
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Abstract
A new insLrument for measuring and recording the brightness of the polarized component of the light scattered by the solar electron corona has been developed and is being mounted for operation on the 26-foot equatorial spar of the High Altitude Observatory at Climax, Colorado. It has three principal features of design: (a) the polarization produced internally is kept at a very low level (<10- ) by using a strictly on-axis optical system and by careful compensation for residual polarization; (b) the scattered photospheric light is minimized, as in a conventional Lyot coronagraph; and (c) the brightness of the polarized light is measured with a sensitive photoelectric polarimeter using electro-optic modulation of the light-beam. Test operation of the instrument in Boulder has resulted in the detection of the electroncoronal light from coronal regions about 0 5 solar radii from the limb and, in one case, at 0.66 solar radii from the limb.
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