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Multiwavelength monitoring observations of Sagittarius A* exhibit variabilityon timescales of minutes to hours, indicating emission regions localized nearthe event horizon. (Sub)Millimeter-wavelength VLBI is uniquely suited to probethe environment of the assumed black hole on these scales. We consider a rangeof orbiting hot-spot and accretion-disk models and find that periodicity in SgrA* flares is detectable using closure quantities. Our methods are applicable toany model producing source structure changes near the black hole, includingjets and magnetohydrodynamic disk instabilities, and suggest that(sub)millimeter VLBI will play a prominent role in investigating Sgr A* nearthe event horizon.

Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI