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Reconnection in strong current-aligned magnetic guide fields allows for theexcitation of the electron-cyclotron-maser instability and emission ofelectromagnetic radiationfrom the electron exhaust at the {\sf X} point. Theelectrons in the guide field remain magnetized, with reconnection barelyaffected. The guide field is responsible for the asymmetric properties of the{\sf X} point and exhaust. Asymmetry in the electron population results inconditions favorable for ECMI. Fundamental mission beneath the guide fieldcyclotron is similar to electron hole emission discussed elsewhere. It can betreated in the proper exhaust frame, and maps the local magnetic field whenmoving together with the exhaust along the guide field. Many applications ofthis mechanism can be imagined. We propose an outline of the mechanism anddiscuss some of its advantages and prospects. Among potential applications areAKR in auroral physics, various types of solar radio emissions during flares,planetary emissions and several astrophysical scenarios involving the presenceof strong fields and field-aligned currents. Escape of radiation from {\sf X}is no problem. However, observation from remote requires traversing thestop-band of X modes and implies source displacements to weaker fields.

Electron cyclotron maser instability (ECMI) in strong magnetic guide field reconnection