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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

10.1016/0378-1127(91)90138-L

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1573-093X

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HighEnergy Emission from a Solar Flare in Hard X

Authors: M R Kundu V V Grechnev S M White E J Schmahl N S Meshalkina L K Kashapova
Publish Date: 2009/10/02
Volume: 260, Issue: 1, Pages: 135-156
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Abstract

We investigate accelerated electron energy spectra for different sources in a large flare using simultaneous observations obtained with two instruments the Nobeyama Radio Heliograph NoRH at 17 and 34 GHz and the Reuven Ramaty High Energy Solar Spectroscopic Imager RHESSI at hard Xrays This flare is one of the few in which emission up to energies exceeding 200 keV can be imaged in hard Xrays Furthermore we can investigate the spectra of individual sources up to this energy We discuss and compare the HXR and microwave spectra and morphology Although the event overall appears to correspond to the standard scenario with magnetic reconnection under an eruptive filament several of its features do not seem to be consistent with popular flare models In particular we find that 1 microwave emissions might be optically thick at high frequencies despite a low peak frequency in the total flux radio spectrum presumably due to the inhomogeneity of the emitting source 2 magnetic fields in highfrequency radio sources might be stronger than sometimes assumed 3 sources spread over a very large volume can show matching evolution in their hard Xray spectra that may provide a challenge to acceleration models Our results emphasize the importance of studies of sunspotassociated flares and total flux measurements of radio bursts in the millimeter range

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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. Estimating Electric Current Densities in Solar Active Regions
  6. Total Solar Irradiance Measurement and Modelling during Cycle 23
  7. Reduced Coronal Emission Above Large Isolated Sunspots
  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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