  We examine some implications of inertial range and dissipation range
correlation and spectral analyses extracted from 33 intervals of Wind magnetic
field data. When field polarity and signatures of cross helicity and magnetic
helicity are examined, most of the datasets suggest some role of cyclotron
resonant dissipative processes involving thermal protons. We postulate that an
active spectral cascade into the dissipation range is balanced by a combination
of cyclotron-resonant and non-cyclotron-resonant kinetic dissipation
mechanisms, of which only the former induces a magnetic helicity signature. A
rate balance theory, constrained by the data, suggests that the ratio of the
two mechanisms is of order unity. While highly simplified, this approach
appears to account for several observed features, and explains why complete
cyclotron absorption, and the corresponding pure magnetic helicity signature,
is usually not observed.
