American Institute of Mathematical Sciences

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May  2012, 6(2): 147-162. doi: 10.3934/ipi.2012.6.147

An interpolation/extrapolation approach to X-ray imaging of solar flares

Silvia Allavena 1, , Michele Piana 1, , Federico Benvenuto 1, and  Anna Maria Massone 2,

1. 

Dipartimento di Matematica, Università di Genova, via Dodecaneso 35 16146 Genova, Italy, Italy, Italy
2. 

CNR - Consiglio Nazionale delle Ricerche, SPIN, Genova, via Dodecaneso 33 16146 Genova, Italy

Received  December 2010 Revised  October 2011 Published  May 2012

We describe an interpolation/extrapolation procedure that reconstructs X-ray maps of solar flares using as input data sparse samples of the Fourier transform of the radiation flux, named visibilities. The algorithm is based on two steps: in the first step the performance of an interpolation routine is optimized by representing the visibilities according to favorable coordinates in the frequency plane. In the second step two extrapolation schemes are introduced, respectively based on the projection and the thresholding of the Landweber iterative method. The procedure is validated against realistic synthetic visibilities and applied to experimental measurements provided by the NASA satellite Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI).
Keywords: iterative regularization methods, soft thresholding., visibilities, Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), X-ray solar imaging.
Mathematics Subject Classification: Primary: 65J22, 68U10; Secondary: 65Z0.
Citation: Silvia Allavena, Michele Piana, Federico Benvenuto, Anna Maria Massone. An interpolation/extrapolation approach to X-ray imaging of solar flares. Inverse Problems & Imaging, 2012, 6 (2) : 147-162. doi: 10.3934/ipi.2012.6.147
References:
[1]

M. J. Aschwanden, E. Schmal and the RHESSI Team, Reconstruction of RHESSI solar flare images with a forward-fitting method,, Solar Phys., 210 (2002), 193. doi: 10.1023/A:1022469811115. Google Scholar

[2]

H. Bialy, Iterative behandlung linearer funktionalgleichungen,, Arch. Rat. Mech. Anal., 4 (1959), 166. doi: 10.1007/BF00281385. Google Scholar

[3]

F. L. Bookstein, Principal warps: Thin-plate splines and the decomposition of deformations,, IEEE Trans. Pattern Anal. Mach. Int., 11 (1989), 567. doi: 10.1109/34.24792. Google Scholar

[4]

S. C. Bong, L. Jeongwoo, D. E. Gary and H. S. Yun, Spatio-spectral maximum entropy method. I. Formulation and test,, Astrophys. J., 636 (2006), 1159. doi: 10.1086/498225. Google Scholar

[5]

T. F. Chan and L. A. Vese, Active contours without edges,, IEEE Trans. Im. Proc., 10 (1997), 266. doi: 10.1109/83.902291. Google Scholar

[6]

D. L. Donoho, Superresolution via sparsity constraints,, SIAM J. Math. Anal., 23 (1992), 1309. doi: 10.1137/0523074. Google Scholar

[7]

I. Daubechies, M. Defrise and C. De Mol, An iterative thresholding algorithm for linear inverse problems with a sparsity constraint,, Comm. Pure Appl. Math., 57 (2004), 1413. doi: 10.1002/cpa.20042. Google Scholar

[8]

R. W. Gerchberg, Super-resolution through error energy reduction,, Optical Acta, 21 (1974), 709. doi: 10.1080/713818946. Google Scholar

[9]

G. J. Hurford, et al., The RHESSI imaging concept,, Solar Phys., 210 (2002), 61. doi: 10.1023/A:1022436213688. Google Scholar

[10]

E. P. Kontar, I. G. Hannah, N. L. S. Jeffrey and M. Battaglia, The sub-arcsecond hard X-ray structure of loop footpoints in a solar flare,, Astrophys. J., 717 (2010). doi: 10.1088/0004-637X/717/1/250. Google Scholar

[11]

R. Lagendijk, J. Biemond and D. Boekee, Regularized iterative image restoration with ringing reduction,, IEEE Trans. Acoust. Speech Signal Process., 36 (1988). doi: 10.1109/29.9032. Google Scholar

[12]

R. P. Lin, et al., The Reuven Ramaty high-energy solar spectroscopic imager,, Solar Phys., 210 (2002), 3. Google Scholar

[13]

A. M. Massone, A. G. Emslie, G. J. Hurford, M. Prato, E. P. Kontar and M. Piana, Hard X-ray imaging of solar flares using interpolated visibilities,, Astrophys. J., 703 (2009), 2004. doi: 10.1088/0004-637X/703/2/2004. Google Scholar

[14]

M. Piana and M. Bertero, Projected Landweber method and preconditioning,, Inverse Problems, 13 (1997), 441. doi: 10.1088/0266-5611/13/2/016. Google Scholar

[15]

Marco Prato, A. Gordon Emslie, Eduard P. Kontar, Anna Maria Massone and Michele Piana, The location of centroids in photon and electron maps of solar flares,, Astrophys. J., 706 (). Google Scholar

[16]

E. J. Schmahl, R. L. Pernak, G. J. Hurford, J. Lee and S. Bong, Analysis of RHESSI flares using a radio astronomical technique,, Solar Phys., 240 (2007), 242. doi: 10.1007/s11207-007-0263-1. Google Scholar

[17]

A. R. Thompson, J. M. Moran and G. W. Swenson, "Interferometry and Synthesis in Radioastronomy,", Wiley, (2004). Google Scholar

[18]

A. N. Tikhonov, A. V. Goncharsky, V. V. Stepanov and A. Yagola, "Numerical Methods for the Solution of Ill-posed Problems,", Translated from the 1990 Russian original by R. A. M. Hoksbergen and revised by the authors, 328 (1990). Google Scholar

show all references

References:
[1]

M. J. Aschwanden, E. Schmal and the RHESSI Team, Reconstruction of RHESSI solar flare images with a forward-fitting method,, Solar Phys., 210 (2002), 193. doi: 10.1023/A:1022469811115. Google Scholar

[2]

H. Bialy, Iterative behandlung linearer funktionalgleichungen,, Arch. Rat. Mech. Anal., 4 (1959), 166. doi: 10.1007/BF00281385. Google Scholar

[3]

F. L. Bookstein, Principal warps: Thin-plate splines and the decomposition of deformations,, IEEE Trans. Pattern Anal. Mach. Int., 11 (1989), 567. doi: 10.1109/34.24792. Google Scholar

[4]

S. C. Bong, L. Jeongwoo, D. E. Gary and H. S. Yun, Spatio-spectral maximum entropy method. I. Formulation and test,, Astrophys. J., 636 (2006), 1159. doi: 10.1086/498225. Google Scholar

[5]

T. F. Chan and L. A. Vese, Active contours without edges,, IEEE Trans. Im. Proc., 10 (1997), 266. doi: 10.1109/83.902291. Google Scholar

[6]

D. L. Donoho, Superresolution via sparsity constraints,, SIAM J. Math. Anal., 23 (1992), 1309. doi: 10.1137/0523074. Google Scholar

[7]

I. Daubechies, M. Defrise and C. De Mol, An iterative thresholding algorithm for linear inverse problems with a sparsity constraint,, Comm. Pure Appl. Math., 57 (2004), 1413. doi: 10.1002/cpa.20042. Google Scholar

[8]

R. W. Gerchberg, Super-resolution through error energy reduction,, Optical Acta, 21 (1974), 709. doi: 10.1080/713818946. Google Scholar

[9]

G. J. Hurford, et al., The RHESSI imaging concept,, Solar Phys., 210 (2002), 61. doi: 10.1023/A:1022436213688. Google Scholar

[10]

E. P. Kontar, I. G. Hannah, N. L. S. Jeffrey and M. Battaglia, The sub-arcsecond hard X-ray structure of loop footpoints in a solar flare,, Astrophys. J., 717 (2010). doi: 10.1088/0004-637X/717/1/250. Google Scholar

[11]

R. Lagendijk, J. Biemond and D. Boekee, Regularized iterative image restoration with ringing reduction,, IEEE Trans. Acoust. Speech Signal Process., 36 (1988). doi: 10.1109/29.9032. Google Scholar

[12]

R. P. Lin, et al., The Reuven Ramaty high-energy solar spectroscopic imager,, Solar Phys., 210 (2002), 3. Google Scholar

[13]

A. M. Massone, A. G. Emslie, G. J. Hurford, M. Prato, E. P. Kontar and M. Piana, Hard X-ray imaging of solar flares using interpolated visibilities,, Astrophys. J., 703 (2009), 2004. doi: 10.1088/0004-637X/703/2/2004. Google Scholar

[14]

M. Piana and M. Bertero, Projected Landweber method and preconditioning,, Inverse Problems, 13 (1997), 441. doi: 10.1088/0266-5611/13/2/016. Google Scholar

[15]

Marco Prato, A. Gordon Emslie, Eduard P. Kontar, Anna Maria Massone and Michele Piana, The location of centroids in photon and electron maps of solar flares,, Astrophys. J., 706 (). Google Scholar

[16]

E. J. Schmahl, R. L. Pernak, G. J. Hurford, J. Lee and S. Bong, Analysis of RHESSI flares using a radio astronomical technique,, Solar Phys., 240 (2007), 242. doi: 10.1007/s11207-007-0263-1. Google Scholar

[17]

A. R. Thompson, J. M. Moran and G. W. Swenson, "Interferometry and Synthesis in Radioastronomy,", Wiley, (2004). Google Scholar

[18]

A. N. Tikhonov, A. V. Goncharsky, V. V. Stepanov and A. Yagola, "Numerical Methods for the Solution of Ill-posed Problems,", Translated from the 1990 Russian original by R. A. M. Hoksbergen and revised by the authors, 328 (1990). Google Scholar

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