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3 minute oscillations are a chromospheric phenomenon:
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should not occur in the corona
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At high frequencies (> 15 GHz),
surfaces never get very
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high,
so not unexpected
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At
lower frequencies where gyroresonance surfaces are
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higher
in the corona, expect
to see effects at edges where
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surfaces
drop into chromosphere, or in o mode
which is 2nd
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harmonic,
hence lower
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Observations at 5 GHz show oscillations at edges (Nindos et
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al.
2002)
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Observations that 8 GHz V oscillations are
anticorrelated
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with I oscillations consistent: 2nd harmonic o mode TB varies,
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3rd
harmonic x mode does not, so V decreases as o mode TB
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and
hence I increases
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