THE TURBULENT CASCADE AND PROTON HEATING IN THE SOLAR WIND DURING SOLAR MINIMUM

The recently protracted solar minimum provided years of interplanetary data that were largely absent in any association with observed large-scale transient behavior on the Sun. With large-scale shear at 1 AU generally isolated to corotating interaction regions, it is reasonable to ask whether the so...

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Bibliographic Details
Published in:The Astrophysical journal 2012-08, Vol.754 (2), p.1-7
Main Authors: COBURN, Jesse T, SMITH, Charles W, VASQUEZ, Bernard J, STAWARZ, Joshua E, FORMAN, Miriam A
Format: Article
Language:English
Subjects:
Admixtures
Advanced Composition Explorer
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Cascades
Earth, ocean, space
Exact sciences and technology
Fluid dynamics
HEATING
INTERPLANETARY SPACE
MAGNETOHYDRODYNAMICS
SHEAR
SOLAR CYCLE
Solar maximum
SOLAR PROTONS
SOLAR WIND
SUN
TRANSIENTS
TURBULENCE
VELOCITY
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Summary:The recently protracted solar minimum provided years of interplanetary data that were largely absent in any association with observed large-scale transient behavior on the Sun. With large-scale shear at 1 AU generally isolated to corotating interaction regions, it is reasonable to ask whether the solar wind is significantly turbulent at this time. We perform a series of third-moment analyses using data from the Advanced Composition Explorer. We show that the solar wind at 1 AU is just as turbulent as at any other time in the solar cycle. Specifically, the turbulent cascade of energy scales in the same manner proportional to the product of wind speed and temperature. Energy cascade rates during solar minimum average a factor of 2-4 higher than during solar maximum, but we contend that this is likely the result of having a different admixture of high-latitude sources.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/754/2/93