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Zebra pattern structure (ZP) is the most intriguing fine structure on thedynamic spectrograph of solar microwave burst. On 15 February 2011, thereerupts an X2.2 flare event on the solar disk, it is the first X-class flaresince the solar Schwabe cycle 24. It is interesting that there are severalmicrowave ZPs observed by the Chinese Solar Broadband Radiospectrometer(SBRS/Huairou) at frequency of 6.40 ~ 7.00 GHz (ZP1), 2.60 ~ 2.75 GHz (ZP2),and the Yunnan Solar Broadband Radio Spectrometer (SBRS/Yunnan) at frequency of1.04 ~ 1.13 GHz (ZP3). The most important phenomena is the unusualhigh-frequency ZP structure (ZP1, up to 7.00 GHz) occurred in the early risingphase of the flare, and there are two ZP structure (ZP2, ZP3) with relative lowfrequencies occurred in the decay phase of the flare. By scrutinizing thecurrent prevalent theoretical models of ZP structure generations, and comparingtheir estimated magnetic field strengths in the corresponding source regions,we suggest that the double plasma resonance model should be the most possibleone for explaining the formation of microwave ZPs, which may derive themagnetic field strengths as about 230 - 345 G, 126 - 147 G, and 23 - 26 G inthe source regions of ZP1, ZP2, and ZP3, respectively.

Microwave Zebra Pattern Structures in the X2.2 Solar Flare on Feb 15, 2011