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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/j.aforl.2013.06.084

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ISSN

1573-093X

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Reduced Coronal Emission Above Large Isolated Suns

Authors: B I Ryabov D E Gary N G Peterova K Shibasaki N A Topchilo
Publish Date: 2014/12/02
Volume: 290, Issue: 1, Pages: 21-35
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Abstract

We analysed specific regions of reduced soft Xray and microwave emission in five large isolated sunspots The Nobeyama Radioheliograph 17 GHz observations reveal a local depression of microwave brightness in the peripheral area of the sunspots The depression regions appear light weak absorption in the He 10830 Å line in areas with extended open field lines as indicated by potential field source surface model PFSS extrapolations up to 15 R⊙ The observed depressions of 3 – 8  in ordinary mode at 17 GHz are interpreted as resulting from free–free emission when the plasma density is lower by 5 – 10  Our model estimates show that the decrease in density in both the coronal and the lower layers above the depression region accounts for the depression These depression regions lend themselves well to marking the location of outward plasma motionsThis work was supported by the Latvian Council of sciences in the frame of the project Nr 111856 DG is supported by NSF grants AGS09059761 AST1312802 AGS1250374 and NASA grant NNX11AB49G to NJIT NT is supported by SPbSU grant 60262010 BR appreciates the hospitality and help of the Nobeyama Solar group during his stay at the Nobeyama Radio Observatory We are grateful to the National Solar Observatory Kitt Peak the Mauna Loa Solar Observatory the Debrecen Heliophysical Observatory and the Nobeyama Radio Observatory teams for making their data available This work was partly carried out on the Solar Data Analysis System operated by the Astronomy Data Center in cooperation with the Hinode Science Center of the National Astronomical Observatory of Japan We thank the anonymous referee for the useful comments that helped improve the manuscript We are grateful to Kazumasa Iwai and Dmitry Bezrukov for the assistance in preparing the data and model estimates


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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. Observational Signatures of Impulsively Heated Coronal Loops: Power-Law Distribution of Energies
  9. Transition of the Sunspot Number from Zurich to Brussels in 1980: A Personal Perspective
  10. Very High-Resolution Solar X-Ray Imaging Using Diffractive Optics
  11. Tracking of Coronal White-Light Events by Texture
  12. An Interpretation of a Possible Mechanism for the First Ground-Level Enhancement of Solar Cycle 24
  13. Velocities and Temperatures of an Ellerman Bomb and Its Associated Features
  14. Kink Wave Propagation in Thin Isothermal Magnetic Flux Tubes
  15. Ensemble Modeling of CMEs Using the WSA–ENLIL+Cone Model
  16. A Simple Way to Estimate the Soft X-ray Class of Far-Side Solar Flares Observed with STEREO/EUVI
  17. Multi-spacecraft Observations of CIR-Associated Ion Increases During the Ulysses 2007 Ecliptic Crossing
  18. Numerical Simulation of a Solar Active Region. I: Bastille Day Flare
  19. Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
  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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