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Fig. 3

image

Radial profiles of a) electron density; b) magnetic field; c) plasma frequency; d) electron-cyclotron frequency; e) ratio of the two frequencies; and f) Alfvén speed along the dashed line in Fig. 2a passing through the active region (red solid line) and the dashed line passing through the quiet Sun in Fig. 2a (purple dashed line). In panel e), the blue dotted line indicates the ωp/ Ωe = 1 level while the blue shaded box represents the height range in the corona where ECM emission is possible.

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