2019-06-12
Solar Measurements for 21 cm Wavelength Using 3 m Radio Telescope
By
Progress In Electromagnetics Research Letters, Vol. 85, 17-24, 2019
Abstract
Solar hydrogen line emission has been observed at the frequency of 1.42 GHz (21 cm wavelength) with 3 m radio telescope installed inside the University of Baghdad campus. Several measurements related to the sun have been conducted and computed from the radio telescope spectrometer. These measurements cover the solar brightness temperature, antenna temperature, solar radio flux, and the antenna gain of the radio telescope. The results demonstrate that the maximum antenna temperature, solar brightness temperature, and solar flux density are found to be 970 K, 49600 K, and 70 SFU respectively. These results show perfect correlation with recent published studies.
Citation
Uday E. Jallod, and Kamal M. Abood, "Solar Measurements for 21 cm Wavelength Using 3 m Radio Telescope," Progress In Electromagnetics Research Letters, Vol. 85, 17-24, 2019.
doi:10.2528/PIERL19041009
References

1. Joardar, S., S. Bhattacharyya, A. B. Bhattacharyya, and C. R. Datta, "Radio astronomy and super synthesis a survey," Progress In Electromagnetic Research B, Vol. 22, 73-102, 2010.
doi:10.2528/PIERB10032105        Google Scholar

2. Usoslin, I. G., "A history of solar activity over millennia. Living rev.," Solar Physics, Vol. 5, No. 3, 6-19, 2008.        Google Scholar

3. Sehorst, C. L., A. V. Silva, and J. E. Costa, "Solar atmospheric model with spicules applied to radio emission," Astronomy and Astrophysics, Vol. 433, 365-374, 2005.
doi:10.1051/0004-6361:20042043        Google Scholar

4. Shibasaki, K., C. E. Alissandrakis, and S. Pojolainen, "Radio emission of the quiet sun and active regions," Solar Physics, Vol. 273, 309-337, 2011.
doi:10.1007/s11207-011-9788-4        Google Scholar

5. Labrum, N. R., "The radio brightness of quiet sun at 21 cm wavelength near sunspot maximum," Australia Journal Physics, Vol. 13, 700-711, 1960.
doi:10.1071/PH600700        Google Scholar

6. Krishnan, T. and N. R. Labrum, "The radio brightness distribution on the sun at 21 cm from combined eclipse and pencil-beam observation," Australia Journal Physics, Vol. 14, 403-419, 1961.
doi:10.1071/PH610403        Google Scholar

7. Shimabukuro, F. I. and J. M. Stacey, "Brightness temperature of the quiet sun at centimeter and millimeter wavelengths," The Astrophysical Journal, Vol. 152, 777-782, 1968.
doi:10.1086/149594        Google Scholar

8. Zirin, H., B. M. Baumert, and G. J. Hurforf, "The microwave brightness temperature spectrum of the quiet sun," The Astrophysical Journal, Vol. 370, 779-783, 1991.
doi:10.1086/169861        Google Scholar

9. Kuseki, R. A., "The solar brightness temperature at millimeter wavelength," Solar Physics, Vol. 48, 41-48, 1976.
doi:10.1007/BF00153329        Google Scholar

10. Dulk, G. A. and D. E Gary, "The sun at 1.4 GHz: Intensity and polarization," Astronomy and Astrophysics, Vol. 124, 103-107, 1983.        Google Scholar

11. Nakariakov, V. M., L. K. Kashapova, and Y. H. Yan, "Editorial: Solar radiophysics-recent results on observations and theories," Research in Astronomy and Astrophysics RAA, Vol. 14, No. 7, 1-6, 2014.
doi:10.1088/1674-4527/14/7/001        Google Scholar

12. Tan, C., Y. Yan, B. Tan, Q. Fu, Y. Lin, and G. Xu, "Study of calibration of solar spectrometer and the quiet sun radio emission," The Astrophysical Journal, Vol. 808, No. 61, 21-41, 2015.        Google Scholar

13. Wilson, T. L., K. Rohlfs, and S. Huttemeister, Tools of Radio Astronomy, 6th Ed., Springer-Verlag Berlin Heideelberg, 2013.
doi:10.1007/978-3-642-39950-3

14. Ptatap, P. and G. Mclntosh, "Measurements of the radiation from thermal and non thermal radio sources," American Association of Physics Teachers, Vol. 73, No. 5, 399-404, 2004.        Google Scholar

15. Neil, K. O., "Single dish calibration techniques at radio wavelength," Astronomical society of the Pacific ASP Conference Series, Vol. 278, San Francisco, CA, 2001.        Google Scholar

16. Saha, S. K., Diffraction-limited Imaging with Large and Moderate Telescopes, World Scientific Publishing Co. Pte. Ltd, 2007.
doi:10.1142/6492

17. Pacini, A. A. and J. P. Raulin, "Solar radio emission," Advances in Space Research, Vol. 35, 793-754, 2005.        Google Scholar

18. Gary, D. and C. Keller, Solar and Space Weather Radio Physics Current Status and Future Developments , Springer Science + Business Media, INC, 2005.
doi:10.1007/1-4020-2814-8

19. Kalinov, V., "Solar observations with the small radio telescope," Bulgarian Astronomical Journal, Vol. 15, 107-112, 2011.        Google Scholar

20. Zaineb, A. J. and K. M. Abood, "Study of some parabolic radio telescope antenna parameter," Iraqi Journal of Science, Special issue, Part B, 453-461, 2016.        Google Scholar

21. Hoobi, M. R. and K. M. Abood, "Calibration of a three meter small radio telescope in baghdad university using the sun as a reference source," Iraqi Journal of Science, Vol. 60, No. 1, 171-177, 2019.        Google Scholar

22. Abood, K. M. and A. M. Kitas, "Background radio emissions at 1.42 GHz," Iraqi Journal of Science, Vol. 59, No. 2A, 786-791, 2018.        Google Scholar

23. Goodman, J. W., Statistical Optics, John Willy & Sons, Inc., New York, 2000.

24., http://www.spaceweather.gc.ca/sx-11-eng.php.        Google Scholar

25., Massachusetts Institute of Technology Haystack Observatory.        Google Scholar

26. Milligan, T. A., Modern Antenna Design, 2nd Ed., A John Wiley & Sons, Inc., 2005.
doi:10.1002/0471720615

27. Balanis, C. A., Antenna Theory Analysis and Design, 3rd Ed., JohnWiley & Sons, Inc., 2005.