An explanation for strongly underwound magnetic field in co-rotating rarefaction regions and its relationship to footpoint motion on the the sun

Details An explanation for strongly underwound magnetic field in co-rotating rarefaction regions and its relationship to footpoint motion on the the sun An explanation for strongly underwound magnetic field in co-rotating rarefaction regions and its relationship to footpoint motion on the the sun

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n...8s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 14, pp. 8-1, CiteID 1663, DOI 10.1029/2002GL015028

Astronomy and Astrophysics

Astrophysics

10

Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Corotating Streams, Interplanetary Physics: Sources Of The Solar Wind, Solar Physics, Astrophysics, And Astronomy: Coronal Holes, And Astronomy: Magnetic Fields

Scientific paper

Strongly underwound magnetic field is observed to be correlated with the occurrence of co-rotating rarefaction regions (CRRs). We demonstrate that the phenomenon is likely caused by the combined action of (1) the motion of footpoints of open magnetic field lines on the Sun from within to outside coronal hole boundaries; and (2) the effect of solar wind shearing in rarefaction regions. We provide formulas that may be used to relate the observed underwinding of magnetic field lines in CRRs to infer the velocities of footpoints through coronal hole boundaries. The observations of strong field underwinding in CRRs generally confirms the hypothesis that the footpoints of open magnetic field lines move on the Sun through coronal holes, the sources of fast solar wind.

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