National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Solar wind origin and acceleration over the solar cycle

ROSES ID: NNH05ZDA001N      Selection Year: 2006      

Program Element: Focused Science Topic

Principal Investigator: Enrico Landi

Affiliation(s): Artep, Inc.

Project Member(s):
Doschek, George A Co-I Code 7670, Naval Research Laboratory
Raymond, John C Co-I Smithsonian Institution Astrophysical Observatory (SAO)


The knowledge of the source region, acceleration mechanism(s) and evolution over the solar cycle are of fundamental importance to NASA's efforts to understand the Sun and its effects on Earth and on human exploration. Here we propose a three-year investigation on the origin and acceleration of the solar wind, and of their evolution over the solar cycle. We will study the physical properties of the solar coronal plasma from the limb out to 4 solar radii making use of spectra from UVCS and SUMER, and images from EIT, Yohkoh and LASCO C1. The observations were taken from 1996 to 2005 and cover nearly an entire solar cycle. The data allow a comprehensive physical description of streamers and coronal holes, where the solar wind originates, and tests of ion-cyclotron wave damping as a mechanism for solar wind heating and acceleration.


Performance YearReferenceInvestigation TypeActions
1Spadaro, D.; Susino, R.; Ventura, R.; Vourlidas, A.;...
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