Abstract
The results of a series of radar studies of the sun at 38.2 MHz are presented. The echoes imply ever-present compressional waves in the corona, and these waves are likely associated with coronal heating. Some echoes are refracted by plasma clouds high in the corona. Other echoes are reflected by dense plasma irregularities moving outward very slowly at 0 to 20 km/sec. These are sometimes found as far out as three solar radii from the sun's center. Suggestions for future solar radar experiments and the need for them are outlined.
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References
Alfvén, H.: 1947,Monthly Notices Roy. Astron. Soc. 107, 211.
Biermann, L.: 1948,Z. Astrophys,25, 161.
Billings, D. E.: 1965,Astrophys. J. 141, 325.
Billings, D. E.: 1966,A Guide to the Solar Corona, Academic Press, New York.
Brandt, J. C.: 1967,Astrophys. J. 149, 447.
Chisholm, J. H. and James, J. C.: 1964,Astrophys. J. 140, 377.
Dessler, A. J.: 1967,Rev. Geophys. 5, 1.
Eshleman, V. R., Barthle, R. C., and Gallagher, P. B.: 1960,Science 131, 329.
Gordon, I. M.: 1968,Astrophys. Letters 2, 49.
James, J. C.: 1964,IEEE Trans. Mil. Elect., MIL-8, 210.
James, J. C.: 1966,Astrophys. J. 146, 356.
James, J. C.: 1968, inRadar Astronomy (ed. by J. V. Evans and T. Hagfors), McGraw-Hill, New York, Chapter 7.
Kuiper, G. P.: 1953,The Sun, University of Chicago Press, Chicago.
Mikhailov, A. A.: 1964,Physics of the Solar System, U.S. Dept. of Commerce, Springfield, Va.
Ness, N. F.: 1968,Ann. Rev. Astron. Astrophys. 6, 79.
Newkirk, G., Jr.: 1967,Ann. Rev. Astron. Astrophys. 5.
Ohlson, J. E.: 1967,Scientific Report No. 1 and No. 21, Stanford Electronics Laboratories, Stanford University.
Olbert, S.: 1968, inPhysics of the Magnetosphere (ed. by R. L. Carovillano), Reidel, Dordrecht, Holland.
Pneuman, G. W.: 1968,Solar Phys. 3, 578–597.
Pneuman, G. W.: 1969,Solar Phys. 6, 255–275.
Pottasch, S. R.: 1960,Astrophys. J. 131, 68.
Schwarzschild, M.: 1948,Astrophys. J. 107, 1.
Shklovskii, I. S.: 1965,Physics of the Solar Corona, 2nd ed., Pergamon and Addison Wesley, London.
Smerd, S. F. and Westfold, K. C.: 1949,Phil. Mag. 40, 831.
Van de Hulst, H. C.: 1953, inThe Sun (ed. by G. P. Kuiper), University of Chicago Press, Chicago.
Waldmeier, M.: 1957,Die Sonnenkorona, Vol II, Birkhäuser, Basel.
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James, J.C. Some observed characteristics of solar radar echoes and their implications. Sol Phys 12, 143–162 (1970). https://doi.org/10.1007/BF02276574
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DOI: https://doi.org/10.1007/BF02276574