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A new mechanism for electromagnetic emission in the terahertz (THz) frequency regime from laserplasma interactions is described. A localized and long-lasting transverse current is produced by two counter-propagating short laser pulses in weakly magnetized plasma. We show that the electromagnetic wave radiating from this current source, even though its frequency is close to cut-off of the ambient plasma, grows and diffuses towards the plasma-vacuum boundary, emitting a strong monochromatic THzdoi:10.1088/1367-2630/17/4/043045 fatcat:3tasztahcjfihahs5zr2gixgnm