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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

10.1002/chin.199846010

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1573-093X

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The SelfInversion of the Sign of Circular Polariz

Authors: T I Kaltman A N Korzhavin N G Peterova
Publish Date: 2007/06/02
Volume: 242, Issue: 1-2, Pages: 125-142
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Abstract

The large active region AR NOAA 5200 from October 1988 is used to investigate the concept of the “halo” a magnetospherelike structure above the active region This structure is studied by using radio spectral polarization observations with high spatial resolution obtained mainly with the radio telescope RATAN600 In the case of AR 5200 the halo emission accounted for 50 of the total AR emission The results of the analysis of the observational data and of the model calculations allow us to reach the following conclusions 1 The halo is a large nonstructured source of emission with a size of the total AR with the emission centered at the dividing neutral line of polarities of the bipolar sunspot group 2 The emission spectrum allows us to distinguish two components a thermal part and a nonthermal part The presence of two components implies that there are two populations of particles with different energy levels in the emission region The phenomenon of inversion of the polarized halo radio emission could be explained by the influence of propagation conditions inside the source The term “selfinversion” is introduced The maximum in the halo density flux spectrum at wavelengths of 5 –10 cm may be explained by scattering resulting from the strong suppression of the emissivity of nonthermal electrons at these and longer wavelengths

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  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. Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
  21. 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
  22. Oscillations in Solar Faculae. III. The Phase Relations Between Chromospheric and Photospheric Line-of-Sight Velocities
  23. A Search for Helioseismic Signature of Emerging Active Regions
  24. Subsecond (0.1 s) Pulsations in the 11 April 2001 Radio Event
  25. Global Heliospheric Parameters and Cosmic-Ray Modulation: An Empirical Relation for the Last Decades
  26. Modeling of EIS Spectrum Drift from Instrumental Temperatures
  27. Preface
  28. Emission of Type II Radio Bursts – Single-Beam Versus Two-Beam Scenario
  29. Historical Heliophysical Series of the Ebro Observatory
  30. Dynamics of an Erupting Arched Magnetic Flux Rope in a Laboratory Plasma Experiment
  31. Eclipses Observed by Large Yield RAdiometer (LYRA) – A Sensitive Tool to Test Models for the Solar Irradiance
  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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