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Hard X‐ray polarimetry of solar flares with BATSE

 

作者: M. McConnell,   D. Forrest,   W. T. Vestrand,   M. Finger,  

 

期刊: AIP Conference Proceedings  (AIP Available online 1996)
卷期: Volume 374, issue 1  

页码: 368-376

 

ISSN:0094-243X

 

年代: 1996

 

DOI:10.1063/1.50972

 

出版商: AIP

 

数据来源: AIP

 

摘要:

We describe a technique for measuring the polarization of hard X‐rays from solar flares based on the angular distribution of that portion of the flux which is scattered off the top of the Earth’s atmosphere. The scattering cross section depends not only on the scatter angle itself, but on the orientation of the scatter angle with respect to the incident polarization vector. Consequently, the distribution of the observed albedo flux will depend on the direction and the polarization properties (i.e., the level of polarization and polarization angle) of the source. Since the albedo component can represent a relatively large fraction (up to 40%) of the direct source flux, there will generally be sufficient signal for making such a measurement. The sensitivity of this approach is therefore dictated by the effective area and the ability of a detector system to ‘image’ the albedo flux. The 4&pgr; coverage of the BATSE detectors on theComptonGamma‐RayObservatoryprovides an opportunity to measure both the direct and the albedo flux from a given solar flare event. Although the BATSE design (with its large field‐of‐view for each detector) is not optimized for albedo polarimetry, we have nonetheless investigated the feasibility of this technique using BATSE data. ©1996 American Institute of Physics.

 

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