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Evidence for opposed currents in active region loops

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Abstract

EUV and X-ray images of the Sun are used as tracers of the magnetic field structure in the Solar atmosphere in order to study the existence of currents in active regions. Criteria are suggested for comparing the data with theoretical extrapolations of magnetic field lines above the level of magnetograph observations. Analysis of the data presented in conjunction with force-free field calculations suggests the existence of currents flowing in opposite directions in nearby sets of loops in the active regions shown. Some simple qualitative implications of opposed current structures are suggested.

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References

  • Altschuler, M. D. and Newkirk, G. N., Jr., 1969: Solar Phys. 9, 131

    Google Scholar 

  • Foukal, P., 1974: in Y. Nakagawa and D. M. Rust (eds.), Flare Related Magnetic Field Dynamics, proceedings of conference in Boulder, Colorado, p. 125.

  • Frazier, E. N., 1972: Solar Phys. 24, 98.

    Google Scholar 

  • Levine, R. H., 1975: Solar Phys. 44, 365.

    Google Scholar 

  • Meyer, R. X., Mayfield, E. B., Underwood, J. H., McKenzie, D. L., Milligan, J. E., deLoach, A. C., and Hoover, R. B., 1974: Proceedings of the AIAA/AGU Conference on Scientific Experiments on Skylab, Huntsville, Alabama. AIAA paper No. 74-1235.

  • Nakagawa, Y. and Raadu, M. A., 1972: Solar Phys. 25, 127.

    Google Scholar 

  • Nakagawa, Y., Raadu, M. A., and Harvey, J., 1973: Solar Phys. 30, 421.

    Google Scholar 

  • Nakagawa, Y., Raadu, M. A., Billings, D. E., and McNamara, D., 1971: Solar Phys. 14, 72.

    Google Scholar 

  • Parker, E. N., 1974: Astrophys. J. 189, 563.

    Google Scholar 

  • Poletto, G., Vaiana, G. S., Zombeck, M. V., Krieger, A. S., and Timothy, A. F., 1975: Solar Phys. 44, 83.

    Google Scholar 

  • Roy, J.-R., 1972: Solar Phys. 26, 418.

    Google Scholar 

  • Rust, D. M., and Roy, J.-R., 1971: in R. Howard (ed.), Solar Magnetic Fields, IAU Symp. 43, 569.

  • Rust, D. M., Nakagawa, Y., and Neupert, W. M., 1975: Solar Phys. 41, 397.

    Google Scholar 

  • Sheeley, N. R., Jr., Bohlin, J. D., Brueckner, G. E., Purcell, J. D., Scherer, V. E., and Tousey, R., 1975a: Solar Phys. 40, 103.

    Google Scholar 

  • Sheeley, N. R., Jr., Bohlin, J. D., Brueckner, G. E., Purcell, J. D., Scherer, V. E., and Tousey, R., 1975b: Solar Phys. 45, 377.

    Google Scholar 

  • Sheeley, N. R., Jr., and Harvey, J. W., 1975: Solar Phys. 45, 275.

    Google Scholar 

  • Stenflo, J. O., 1973: Solar Phys. 32, 41.

    Google Scholar 

  • Tanaka, K., and Nakagawa, Y., 1973: Solar Phys. 33, 187.

    Google Scholar 

  • Vaiana, G., 1975, private communication.

  • Veeder, G. J. and Zirin, H., 1970: Solar Phys. 12, 391.

    Google Scholar 

  • Wellck, R. E. and Nakagawa, Y., 1973: NCAR Technical Note TN/STR-87.

Download references

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Authors and Affiliations

  1. Center for Astrophysics, Harvard College Observatory, Smithsonian Astrophysical Observatory, 02138, Cambridge, Mass., U.S.A.

    Randolph H. Levine

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  1. Randolph H. Levine
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Levine, R.H. Evidence for opposed currents in active region loops. Sol Phys 46, 159–170 (1976). https://doi.org/10.1007/BF00157562

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  • DOI: https://doi.org/10.1007/BF00157562

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