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Record Details

Record 89 of 29433
Coronal Plumes in the Fast Solar Wind
External Online Source: doi:10.1088/0004-637x/736/1/32
Author and Affiliation:
Velli, Marco(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Lionello, Roberto(Predictive Science, Inc., San Diego, CA, United States)
Linker, Jon A.(Predictive Science, Inc., San Diego, CA, United States)
Mikic, Zoran(Predictive Science, Inc., San Diego, CA, United States)
Abstract: The expansion of a coronal hole filled with a discrete number of higher density coronal plumes is simulated using a time-dependent two-dimensional code. A solar wind model including an exponential coronal heating function and a flux of Alfven waves propagating both inside and outside the structures is taken as a basic state. Different plasma plume profiles are obtained by using different scale heights for the heating rates. Remote sensing and solar wind in situ observations are used to constrain the parameter range of the study. Time dependence due to plume ignition and disappearance is also discussed. Velocity differences of the order of approximately 50 km/s, such as those found in microstreams in the high-speed solar wind, may be easily explained by slightly different heat deposition profiles in different plumes. Statistical pressure balance in the fast wind data may be masked by the large variety of body and surface waves which the higher density filaments may carry, so the absence of pressure balance in the microstreams should not rule out their interpretation as the extension of coronal plumes into interplanetary space. Mixing of plume-interplume material via the Kelvin-Helmholtz instability seems to be possible within the parameter ranges of the models defined here, only at large di stances from the Sun, beyond 0.2-0.3 AU. Plasma and composition measurements in the inner heliosphere, such as those which will become available with Solar Orbiter and Solar Probe Plus, should therefore definitely be able to identify plume remnants in the solar wind.
Publication Date: Jul 01, 2011
Document ID:
20110016220
(Acquired Oct 17, 2011)
Subject Category: SOLAR PHYSICS
Document Type: Journal Article
Publication Information: The Astrophysical Journal; Volume 736; No. 1
Publisher Information: IOP Publishing
Contract/Grant/Task Num: NNG09EJ95C
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Air Force Office of Scientific Research, Bolling AFB; Washington, DC, United States
National Science Foundation; Arlington, VA, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 7p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: PLUMES; SOLAR WIND; SUN; SOLAR RADIATION; MAGNETOHYDRODYNAMICS; MAGNETOHYDRODYNAMIC SIMULATION; HELIOSPHERE; CORONAL HOLES; REMOTE SENSING; SOLAR PROBES; COSMIC PLASMA; KELVIN-HELMHOLTZ INSTABILITY; MAGNETOHYDRODYNAMIC WAVES
Availability Source: Other Sources
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Last Modified: October 17, 2011
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