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Magnetography of Solar Flaring Loops with Microwave Imaging Spectropolarimetry

  • Coronal Magnetometry
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Abstract

We have developed a general framework for modeling gyrosynchrotron and free–free emission from solar flaring loops and used it to test the premise that 2D maps of source parameters, particularly the magnetic field, can be deduced from spatially resolved microwave spectropolarimetry data. We show quantitative results for a flaring loop with a realistic magnetic geometry, derived from a magnetic-field extrapolation, and containing an electron distribution with typical thermal and nonthermal parameters, after folding through the instrumental profile of a realistic interferometric array. We compare the parameters generated from forward-fitting a homogeneous source model to each line of sight through the folded image data cube both with the original parameters used in the model and with parameters generated from forward-fitting a homogeneous source model to the original (unfolded) image data cube. We find excellent agreement in general, but with systematic effects that can be understood as due to the finite resolution in the folded images and the variation of parameters along the line of sight, which are ignored in the homogeneous source model. We discuss the use of such 2D parameter maps within a larger framework of 3D modeling, and the prospects for applying these methods to data from a new generation of multifrequency radio arrays now or soon to be available.

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References

  • Altyntsev, A.T., Fleishman, G.D., Huang, G.-L., Melnikov, V.F.: 2008, A broadband microwave burst produced by electron beams. Astrophys. J. 677, 1367 – 1377. doi: 10.1086/528841 .

    Article  ADS  Google Scholar 

  • Aschwanden, M.J.: 2008, Keynote address: outstanding problems in solar physics. J. Astrophys. Astron. 29, 3 – 16. doi: 10.1007/s12036-008-0002-5 .

    Article  ADS  Google Scholar 

  • Bastian, T.S.: 1995, Angular scattering of radio waves: implications for mode coupling in the solar corona. Astrophys. J. 439, 494 – 498. doi: 10.1086/175190 .

    Article  ADS  Google Scholar 

  • Bastian, T.S.: 2006, Magnetic field measurements in flare loops and CMEs. In: Casini, R., Lites, B.W. (eds.) Solar Polarization 4 CS-358, Astron. Soc. Pac., San Francisco, 173.

    Google Scholar 

  • Bastian, T.S., Benz, A.O., Gary, D.E.: 1998, Radio emission from solar flares. Annu. Rev. Astron. Astrophys. 36, 131 – 188. doi: 10.1146/annurev.astro.36.1.131 .

    Article  ADS  Google Scholar 

  • Bastian, T.S., Fleishman, G.D., Gary, D.E.: 2007, Radio spectral evolution of an X-ray-poor impulsive solar flare: implications for plasma heating and electron acceleration. Astrophys. J. 666, 1256 – 1267. doi: 10.1086/520106 .

    Article  ADS  Google Scholar 

  • Conway, J.E., Cornwell, T.J., Wilkinson, P.N.: 1990, Multi-frequency synthesis – a new technique in radio interferometric imaging. Mon. Not. Roy. Astron. Soc. 246, 490.

    ADS  Google Scholar 

  • De Rosa, M.L., Schrijver, C.J., Barnes, G., Leka, K.D., Lites, B.W., Aschwanden, M.J., Amari, T., Canou, A., McTiernan, J.M., Régnier, S., Thalmann, J.K., Valori, G., Wheatland, M.S., Wiegelmann, T., Cheung, M.C.M., Conlon, P.A., Fuhrmann, M., Inhester, B., Tadesse, T.: 2009, A critical assessment of nonlinear force-free field modeling of the solar corona for active region 10953. Astrophys. J. 696, 1780 – 1791. doi: 10.1088/0004-637X/696/2/1780 .

    Article  ADS  Google Scholar 

  • Fleishman, G.D., Kuznetsov, A.A.: 2010, Fast gyrosynchrotron codes. Astrophys. J. 721, 1127 – 1141. doi: 10.1088/0004-637X/721/2/1127 .

    Article  ADS  Google Scholar 

  • Fleishman, G.D., Nita, G.M., Gary, D.E.: 2009, Dynamic magnetography of solar flaring loops. Astrophys. J. Lett. 698, L183 – L187. doi: 10.1088/0004-637X/698/2/L183 .

    Article  ADS  Google Scholar 

  • Fleishman, G., Gary, D., Nita, G., Alexander, D., Aschwanden, M., Bastian, T., Hudson, H., Hurford, G., Kontar, E., Longcope, D., Mikic, Z., DeRosa, M., Ryan, J., White, S.: 2010, Uncovering mechanisms of coronal magnetism via advanced 3D modeling of flares and active regions. arXiv:1011.2800 .

  • Fleishman, G.D., Kontar, E.P., Nita, G.M., Gary, D.E.: 2011, A cold, tenuous solar flare: acceleration without heating. Astrophys. J. Lett. 731, L19. doi: 10.1088/2041-8205/731/1/L19 .

    Article  ADS  Google Scholar 

  • Fleishman, G.D., Kontar, E.P., Nita, G.M., Gary, D.E.: 2013, Probing dynamics of electron acceleration with radio and X-ray spectroscopy, imaging, and timing in the 2002 April 11 solar flare. Astrophys. J. 768, 1. doi: 10.1088/0004-637X/768/1/1 . arXiv:1303.4098 .

    Article  Google Scholar 

  • Gary, D.E., Keller, C.U. (eds.): 2004, Solar and Space Weather Radiophysics – Current Status and Future Developments, Astrophys. Space Science Lib. 314, Kluwer Academic. Dordrecht.

    Google Scholar 

  • Gary, D.E., Hurford, G.J., Nita, G.M., White, S.M., Tun, S.D., Fleishman, G.D., McTiernan, J.M.: 2011, The expanded Owens Valley solar array. Bull. Am. Astron. Soc. 42, 102.

    Google Scholar 

  • Lin, H., Kuhn, J.R., Coulter, R.: 2004, Coronal magnetic field measurements. Astrophys. J. Lett. 613, L177 – L180. doi: 10.1086/425217 .

    Article  ADS  Google Scholar 

  • Lin, H., Penn, M.J., Tomczyk, S.: 2000, A new precise measurement of the coronal magnetic field strength. Astrophys. J. Lett. 541, L83 – L86. doi: 10.1086/312900 .

    Article  ADS  Google Scholar 

  • Liu, Y., Lin, H.: 2008, Observational test of coronal magnetic field models. I. Comparison with potential field model. Astrophys. J. 680, 1496 – 1507. doi: 10.1086/588645 .

    Article  ADS  Google Scholar 

  • Metcalf, T.R., Leka, K.D., Barnes, G., Lites, B.W., Georgoulis, M.K., Pevtsov, A.A., Balasubramaniam, K.S., Gary, G.A., Jing, J., Li, J., Liu, Y., Wang, H.N., Abramenko, V., Yurchyshyn, V., Moon, Y.-J.: 2006, An overview of existing algorithms for resolving the 180∘ ambiguity in vector magnetic fields: quantitative tests with synthetic data. Solar Phys. 237, 267 – 296. doi: 10.1007/s11207-006-0170-x .

    Article  ADS  Google Scholar 

  • Mok, Y., Mikić, Z., Lionello, R., Linker, J.A.: 2008, The formation of coronal loops by thermal instability in three dimensions. Astrophys. J. Lett. 679, L161 – L165. doi: 10.1086/589440 .

    Article  ADS  Google Scholar 

  • Nita, G.M., Fleishman, G.D., Gary, D.E., Kuznetsov, A., Kontar, E.P.: 2011, GX_Simulator: an interactive IDL widget tool for visualization and simulation of imaging spectroscopy. Bull. Am. Astron. Soc. 42, 1811.

    Google Scholar 

  • Nita, G.M., Fleishman, G.D., Gary, D.E., Kuznetsov, A., Kontar, E.P.: 2012, Integrated IDL tool for 3D modeling and imaging data analysis. Bull. Am. Astron. Soc. 220, 51.

    Google Scholar 

  • Press, W.H., Flannery, B.P., Teukolsky, S.A.: 1986, Numerical Recipes. The Art of Scientific Computing, Cambridge University Press, Cambridge.

    MATH  Google Scholar 

  • Rau, U., Cornwell, T.J.: 2011, A multi-scale multi-frequency deconvolution algorithm for synthesis imaging in radio interferometry. Astron. Astrophys. 532, A71. doi: 10.1051/0004-6361/201117104 .

    Article  ADS  Google Scholar 

  • Sault, R.J., Wieringa, M.H.: 1994, Multi-frequency synthesis techniques in radio interferometric imaging. Astron. Astrophys. Suppl. Ser. 108, 585 – 594.

    ADS  Google Scholar 

  • Sault, R.J., Teuben, P.J., Wright, M.C.H.: 2011, MIRIAD: multi-channel image reconstruction, image analysis, and display. In: Astrophysics Source Code Library, 6007, ascl.net/1106.007 .

    Google Scholar 

  • Socas-Navarro, H., Elmore, D., Pietarila, A., Darnell, A., Lites, B.W., Tomczyk, S., Hegwer, S.: 2006, Spinor: visible and infrared spectro-polarimetry at the National Solar Observatory. Solar Phys. 235, 55 – 73. doi: 10.1007/s11207-006-0020-x .

    Article  ADS  Google Scholar 

  • Tomczyk, S.: 2012, The Coronal Solar Magnetism Observatory (COSMO). Am. Astron. Soc. Meet. 220, #202.11. ADS: 2012AAS...22020211T .

    ADS  Google Scholar 

  • White, S.M., Thejappa, G., Kundu, M.R.: 1992, Observations of mode coupling in the solar corona and bipolar noise storms. Solar Phys. 138, 163 – 187. doi: 10.1007/BF00146202 .

    Article  ADS  Google Scholar 

  • Wiegelmann, T., Inhester, B., Sakurai, T.: 2006, Preprocessing of Vector Magnetograph data for a nonlinear force-free magnetic field reconstruction. Solar Phys. 233, 215 – 232. doi: 10.1007/s11207-006-2092-z .

    Article  ADS  Google Scholar 

  • Wiegelmann, T., Thalmann, J.K., Schrijver, C.J., De Rosa, M.L., Metcalf, T.R.: 2008, Can we improve the preprocessing of photospheric vector magnetograms by the inclusion of chromospheric observations? Solar Phys. 247, 249 – 267. doi: 10.1007/s11207-008-9130-y .

    Article  ADS  Google Scholar 

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Acknowledgements

This work was supported in part by NSF grants AGS-0961867, AST-0908344, AGS-1250374 and NASA grants NNX10AF27G and NNX11AB49G to the New Jersey Institute of Technology. This work also benefited from workshop support from the International Space Science Institute (ISSI).

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  1. Physics Dept., New Jersey Institute of Technology, Newark, NJ, USA

    D. E. Gary, G. D. Fleishman & G. M. Nita

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  1. D. E. Gary
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  2. G. D. Fleishman
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  3. G. M. Nita
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Correspondence to D. E. Gary.

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Coronal Magnetometry

Guest Editors: S. Tomczyk, J. Zhang, and T.S. Bastian

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Gary, D.E., Fleishman, G.D. & Nita, G.M. Magnetography of Solar Flaring Loops with Microwave Imaging Spectropolarimetry. Sol Phys 288, 549–565 (2013). https://doi.org/10.1007/s11207-013-0299-3

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