Abstract
Analysis of the photospheric and chromospheric activity at the sites of enhanced 5303 Å coronal intensity revealed some important aspects of their association. We have examined the daily maps of 5303 Å coronal line intensity of Lomnický Štít for the low sunspot activity years 1985 and 1986 in association with the cotemporal daily maps of sunspots, plages and Stanford magnetograms and identified strong field gradients at the sites of enhanced intensity regions. We found that the peak intensity does not depend on the strength of the underlying magnetic field though the coronal intensity-enhanced feature is almost sure to occur at the locations of sunspots with strong magnetic fields and at the locations of plages having larger areas.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Airapetian, V. S. and Smartt, R. N.: 1995, Astrophys. J. 445, 489.
Altrock, R. C. (ed.): 1987, Solar and Stellar Coronal Structure and Dynamics, Proceedings of Ninth Sacramento Peak Summer Symposium, Sunspot, NM, p. 414.
Altrock, R. C.: 1993, in J. M. Pap, C. Fröhlich, H. S. Hudson, and S. K. Solanki (eds.), ‘The Sun as a Variable Star’, Proc. IAU Colloq. 143, 172.
Altrock, R. C., Hick, P., Jackson, B. V., Hoeksema, J. T., Zhao, X. P., Slater, G., and Henry, T. W.: 1996, Adv. Space Res. 17(4/5), 235.
Falconer, D. A., Moore, R. L., Porter, J. G., Gary, G. A., and Shimizu, T.: 1997, Astrophys. J. 482, 519.
Guhathakurta, M., Fisher, R. R., and Altrock, R. C.: 1993, Astrophys. J. 414, L145.
Guhathakurta, M. and Fisher, R. R.: 1994, Solar Phys. 152, 181.
Hara, H., Tsuneta, S., Lemen, J. R., Acton,W., and McTiernan, J. M.: 1992, Publ. Astron. Soc. Japan 44, L135.
Hick, P., Jackson, B. V., Altrock, R. C., Slater, G., and Henry, T.: 1996, in K. S. Balasubramaniam et al.(eds.), Solar Drivers of Interplanetary and Terrestrial Disturbances, Proceedings of Sixteenth International NSO/SPWorkshop, Sunspot, NM, p. 358.
Ichimoto, K., Hara, H., Takeda, A., Kumagai, K., Sakurai, T., Shimazu, T., and Hudson, H. S.: 1995, Astrophys. J. 445, 978.
Nagasawa, S.: 1961, Publ. Astron. Soc. Japan 13, 384.
Ramesh, K. B.: 1998a, Solar Phys. 177, 311.
Ramesh, K. B.: 1998b, Solar Phys. 183, 295.
Rybanský, M.: 1975, Bull. Astron. Inst. Czech. 26, 367.
Rybanský, M. and Rušin, V.: 1987, in R. C. Altrock (ed.), Solar and Stellar Coronal Structure and Dynamics, Proceedings of Ninth Sacramento Peak Summer Symposium, Sunspot, NM, p. 342.
Rybanský, M., Rušin, V., Gaspar, P., and Altrock, R. C.: 1994, Solar Phys. 152, 487.
Schwenn, R. et al.: 1997, Solar Phys. 175, 667.
Smartt, R. N., Zhang, Z., and Smutko, M. F.: 1993, Solar Phys. 148, 139.
Sýkora, J.: 1969, Bull. Astron. Inst. Czech. 20, 70.
Sýkora, J.: 1994, Adv. Space Res. 14(4), 73.
Wang, Y.-M, Sheeley, N. R., Jr., Hawley, S.H., Kramer, J. R., Brueckner, G. E., Howard, R. A., Korendyke, C. M., Michels, D. J., Moulton, N. E., Socker, D. G., and Schwenn, R.: 1997, Astrophys. J. 485, 419.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ramesh, K., Nagabhushana, B. & Varghese, B. Green coronal intensity enhancements and their relation to the underlying photospheric/chromospheric activity. Solar Physics 188, 99–113 (1999). https://doi.org/10.1023/A:1005196830276
Published:
Issue Date:
DOI: https://doi.org/10.1023/A:1005196830276