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The analysis of the spectral characteristics of the burst radio emission onJune 21, 2011 was carried out on the basis of an improved methodology fordetermining harmonic numbers for the corresponding stripes of the zebrastructure. By using the parameters of the zebra structure in the time frequencyspectrum and basing on the double plasma resonance model, the magnetic fieldand its dynamics, electron density, and the time variation of the distancebetween the stripes with harmonics s = 55 and 56 and adjacent stripes near thefrequency 183 MHz have been determined in the burst generation region. Therelationships between the scale characteristics of the field and the densityalong and across the axis of the power tube and their dependence on time havebeen also determined. The field obtained (1.5 G for the first harmonic and 0.75G for the second harmonic of the plasma frequency) turned out to be so smallthat, firstly, it fails to explain the dynamic features of the spectrum basedon MHD waves, and secondly, it results in large values for plasma betta (>1).Other possible difficulties of the generation mechanism of bursts with zebrapattern based on the double plasma resonance are also noted. Another possiblemechanism, with whistlers explains qualitatively the main observationalcharacteristics of this zebra. The magnetic field required in this case isabout 4.5 G, and the plasma betta is 0.14, which fully corresponds to thecoronal conditions.

Alternative Models of Zebra Patterns in the Event on June 21, 2011