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The Antarctic Impulsive Transient Antenna (ANITA) completed its secondlong-duration balloon flight in January 2009, with 31 days aloft (28.5 livedays) over Antarctica. ANITA searches for impulsive coherent radio Cherenkovemission from 200 to 1200 MHz, arising from the Askaryan charge excess inultra-high energy neutrino-induced cascades within Antarctic ice. This flightincluded significant improvements over the first flight in the payloadsensitivity, efficiency, and a flight trajectory over deeper ice. Analysis ofin-flight calibration pulses from surface and sub-surface locations verifiesthe expected sensitivity. In a blind analysis, we find 2 surviving events on abackground, mostly anthropogenic, of 0.97+-0.42 events. We set the strongestlimit to date for 1-1000 EeV cosmic neutrinos, excluding several currentcosmogenic neutrino models.

Observational Constraints on the Ultra-high Energy Cosmic Neutrino Flux from the Second Flight of the ANITA Experiment