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Solar Physics

, Volume 281, Issue 1, pp 237–262 | Cite as

Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind

  • L. van Driel-GesztelyiEmail author
  • J. L. Culhane
  • D. Baker
  • P. Démoulin
  • C. H. Mandrini
  • M. L. DeRosa
  • A. P. Rouillard
  • A. Opitz
  • G. Stenborg
  • A. Vourlidas
  • D. H. Brooks
THE SUN 360

Abstract

During 2 – 18 January 2008 a pair of low-latitude opposite-polarity coronal holes (CHs) were observed on the Sun with two active regions (ARs) and the heliospheric plasma sheet located between them. We use the Hinode/EUV Imaging Spectrometer (EIS) to locate AR-related outflows and measure their velocities. Solar-Terrestrial Relations Observatory (STEREO) imaging is also employed, as are the Advanced Composition Explorer (ACE) in-situ observations, to assess the resulting impacts on the solar wind (SW) properties. Magnetic-field extrapolations of the two ARs confirm that AR plasma outflows observed with EIS are co-spatial with quasi-separatrix layer locations, including the separatrix of a null point. Global potential-field source-surface modeling indicates that field lines in the vicinity of the null point extend up to the source surface, enabling a part of the EIS plasma upflows access to the SW. We find that similar upflow properties are also observed within closed-field regions that do not reach the source surface. We conclude that some of plasma upflows observed with EIS remain confined along closed coronal loops, but that a fraction of the plasma may be released into the slow SW. This suggests that ARs bordering coronal holes can contribute to the slow SW. Analyzing the in-situ data, we propose that the type of slow SW present depends on whether the AR is fully or partially enclosed by an overlying streamer.

Keywords

Active regions Magnetic field Magnetic extrapolations Solar wind 

List of Acronyms

ACE

Advanced Composition Explorer

AR

active region

CH

coronal hole

EIS

EUV Imaging Spectrometer

FIP

first ionization potential

FoV

field of view

HCS

Heliospheric Current Sheet

HPS

Heliospheric Plasma Sheet

LFFF

linear force-free field

PFSS

potential-field source-surface

QSL

quasi-separatrix layer

RF

rarefaction region

SIR

Stream Interaction Region

STEREO

Solar-Terrestrial Relations Observatory

SW

solar wind

XRT

X-ray Telescope

Notes

Acknowledgements

We thank the anonymous referee for constructive comments, which helped us in improving and clarifying the article. The research leading to these results has received funding from the European Commission’s Seventh Framework Programme under the grant agreement No. 284461 (eHEROES project). LvDG’s work was supported by the Hungarian Research grant OTKA K-081421. CHM acknowledges financial support from the Argentinean grants PICT 2007-1790, UBACyT 20020100100733 and PIP 2009-100766 (CONICET). CHM is a member of the Carrera del Investigador Científico (CONICET). PD and CHM thank ECOS-MINCyT for their cooperative science program A08U01. The work of DHB was performed under contract with the Naval Research Laboratory and was funded by the NASA Hinode program.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • L. van Driel-Gesztelyi
    • 1
    • 2
    • 3
    Email author
  • J. L. Culhane
    • 1
    • 4
  • D. Baker
    • 1
  • P. Démoulin
    • 2
  • C. H. Mandrini
    • 5
    • 6
  • M. L. DeRosa
    • 7
  • A. P. Rouillard
    • 8
    • 9
  • A. Opitz
    • 8
    • 9
  • G. Stenborg
    • 10
  • A. Vourlidas
    • 11
  • D. H. Brooks
    • 10
  1. 1.Mullard Space Science LaboratoryUniversity College LondonDorkingUK
  2. 2.Observatoire de Paris, LESIA, CNRS, UPMC Univ. Paris 06Univ. Paris-DiderotMeudonFrance
  3. 3.Konkoly ObservatoryHungarian Academy of SciencesBudapestHungary
  4. 4.International Space Science InstituteBernSwitzerland
  5. 5.Instituto de Astronomía y Física del EspacioCONICET-UBABuenos AiresArgentina
  6. 6.Facultad de Ciencias Exactas y NaturalesFCEN-UBABuenos AiresArgentina
  7. 7.Lockheed Martin Solar and Astrophysics LaboratoryPalo AltoUSA
  8. 8.Institut de Recherche en Astrophysique et PlanétologieUniversité de Toulouse (UPS)ToulouseFrance
  9. 9.Centre National de la Recherche ScientifiqueUMR 5277ToulouseFrance
  10. 10.College of ScienceGeorge Mason UniversityFairfaxUSA
  11. 11.Space Science DivisionNaval Research LaboratoryWashingtonUSA

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