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Scientific objectives of MWRH
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1. Magnetography of the corona -
determination of the structure and strength of
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magnetic
fields. The effectiveness of magnetic field measurements in the active
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region
corona was demonstrated by RATAN and VLA observations, with
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limitations
in spatial resolutions and the field of view, respectively. MWRH would
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provide
measurements of the field at a number of levels in the chromosphere and
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corona
(estimations of the magnetic field in the chromosphere from the Zeeman
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effect
are made difficult by the structure of spectral lines). Angular resolution
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varies
linearly with frequency. Therefore, even in the case of a discrete set of
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frequencies,
MWRH can provide contours of field levels at the base of the corona
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by
assuming the emission from the 3rd gyrolevel B = 120 f (GHz). The
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coincidence
of the SSRT and NRH observing intervals brings the number of
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frequencies
to eight. In relatively weak fields, information about the magnitude of
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the
magnetic field along the line of sight is furnished by the degree of
polarization.
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Investigation
of oscillatory processes at different frequencies (levels in the solar
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atmosphere) is
also associated with this problem.
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