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Title of Journal: Sol Phys

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Abbravation: Solar Physics

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Springer Netherlands

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DOI

10.1016/0022-3093(94)90691-2

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ISSN

1573-093X

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Magnetic Topology of Active Regions and Coronal Ho

Authors: L van DrielGesztelyi 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
Publish Date: 2012/09/07
Volume: 281, Issue: 1, Pages: 237-262
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Abstract

During 2 – 18 January 2008 a pair of lowlatitude oppositepolarity 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 ARrelated outflows and measure their velocities SolarTerrestrial Relations Observatory STEREO imaging is also employed as are the Advanced Composition Explorer ACE insitu observations to assess the resulting impacts on the solar wind SW properties Magneticfield extrapolations of the two ARs confirm that AR plasma outflows observed with EIS are cospatial with quasiseparatrix layer locations including the separatrix of a null point Global potentialfield sourcesurface 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 closedfield 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 insitu data we propose that the type of slow SW present depends on whether the AR is fully or partially enclosed by an overlying streamer


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Other Papers In This Journal:

  1. Coronal Mass Ejections from the Same Active Region Cluster: Two Different Perspectives
  2. Gnevyshev Peaks in the CME Average Speeds in Cycle 23
  3. Mapping Solar Wind Streams from the Sun to 1 AU: A Comparison of Techniques
  4. Non-reflective Propagation of Kink Waves in Coronal Magnetic Loops
  5. High-Energy Emission from a Solar Flare in Hard X-rays and Microwaves
  6. Estimating Electric Current Densities in Solar Active Regions
  7. Total Solar Irradiance Measurement and Modelling during Cycle 23
  8. Reduced Coronal Emission Above Large Isolated Sunspots
  9. Observational Signatures of Impulsively Heated Coronal Loops: Power-Law Distribution of Energies
  10. Transition of the Sunspot Number from Zurich to Brussels in 1980: A Personal Perspective
  11. Very High-Resolution Solar X-Ray Imaging Using Diffractive Optics
  12. Tracking of Coronal White-Light Events by Texture
  13. An Interpretation of a Possible Mechanism for the First Ground-Level Enhancement of Solar Cycle 24
  14. Velocities and Temperatures of an Ellerman Bomb and Its Associated Features
  15. Kink Wave Propagation in Thin Isothermal Magnetic Flux Tubes
  16. Ensemble Modeling of CMEs Using the WSA–ENLIL+Cone Model
  17. A Simple Way to Estimate the Soft X-ray Class of Far-Side Solar Flares Observed with STEREO/EUVI
  18. Multi-spacecraft Observations of CIR-Associated Ion Increases During the Ulysses 2007 Ecliptic Crossing
  19. Numerical Simulation of a Solar Active Region. I: Bastille Day Flare
  20. Variations in Ratio and Correlation of Solar Magnetic Fields in the Fe i 525.02 nm and Na i 589.59 nm Lines According to Mount Wilson Measurements During 2000 – 2012
  21. Oscillations in Solar Faculae. III. The Phase Relations Between Chromospheric and Photospheric Line-of-Sight Velocities
  22. A Search for Helioseismic Signature of Emerging Active Regions
  23. Subsecond (0.1 s) Pulsations in the 11 April 2001 Radio Event
  24. Global Heliospheric Parameters and Cosmic-Ray Modulation: An Empirical Relation for the Last Decades
  25. Modeling of EIS Spectrum Drift from Instrumental Temperatures
  26. Preface
  27. Emission of Type II Radio Bursts – Single-Beam Versus Two-Beam Scenario
  28. Historical Heliophysical Series of the Ebro Observatory
  29. Dynamics of an Erupting Arched Magnetic Flux Rope in a Laboratory Plasma Experiment
  30. Eclipses Observed by Large Yield RAdiometer (LYRA) – A Sensitive Tool to Test Models for the Solar Irradiance
  31. The Self-Inversion of the Sign of Circular Polarization in “Halo” Microwave Sources
  32. Recent Developments of NEMO: Detection of EUV Wave Characteristics
  33. Design and Ground Calibration of the Helioseismic and Magnetic Imager (HMI) Instrument on the Solar Dynamics Observatory (SDO)
  34. Preface
  35. Evidence that Synchrotron Emission from Nonthermal Electrons Produces the Increasing Submillimeter Spectral Component in Solar Flares

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