Paper Search Console

Home Search Page About Contact

Journal Title

Title of Journal: Sol Phys

Search In Journal Title:

Abbravation: Solar Physics

Search In Journal Abbravation:

Publisher

Springer Netherlands

Search In Publisher:

DOI

10.1002/bmc.3378

Search In DOI:

ISSN

1573-093X

Search In ISSN:
Search In Title Of Papers:

Very HighResolution Solar XRay Imaging Using Dif

Authors: B R Dennis G K Skinner M J Li A Y Shih
Publish Date: 2012/06/12
Volume: 279, Issue: 2, Pages: 573-588
PDF Link

Abstract

This paper describes the development of Xray diffractive optics for imaging solar flares with better than 01 arcsec angular resolution Xray images with this resolution of the ≥ 10 MK plasma in solar active regions and solar flares would allow the crosssectional area of magnetic loops to be resolved and the coronal flare energy release region itself to be probed The objective of this work is to obtain Xray images in the ironline complex at 67 keV observed during solar flares with an angular resolution as fine as 01 arcsec – over an order of magnitude finer than is now possible This line emission is from highly ionized iron atoms primarily Fe xxv in the hottest flare plasma at temperatures in excess of ≈ 10 MK It provides information on the flare morphology the iron abundance and the distribution of the hot plasma Studying how this plasma is heated to such high temperatures in such short times during solar flares is of critical importance in understanding these powerful transient events one of the major objectives of solar physics We describe the design fabrication and testing of phase zone plate Xray lenses with focal lengths of ≈ 100 m at these energies that would be capable of achieving these objectives We show how such lenses could be included on a twospacecraft formationflying mission with the lenses on the spacecraft closest to the Sun and an Xray imaging array on the second spacecraft in the focal plane ≈ 100 m away Highresolution Xray images could be obtained when the two spacecraft are aligned with the region of interest on the Sun Requirements and constraints for the control of the two spacecraft are discussed together with the overall feasibility of such a formationflying missionWe thank John Krizmanic and Keith Gendreau for supporting the lens design and testing effort Kenneth Phillips for providing the spectra shown in Figure 1 and for help with the solar objectives and Amil Patel Gang Hu and Thitima Suwannasiri for their work fabricating the lenses in Goddard’s Detector Development Lab This project was supported with funding from the Goddard Internal Research and Development IRAD program CHIANTI is a collaborative project involving George Mason University the University of Michigan USA and the University of Cambridge UK


Keywords:

References


.
Search In Abstract Of Papers:
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. 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

Search Result: