Open Access Journal

ISSN : 2394 - 6849 (Online)

International Journal of Engineering Research in Electronics and Communication Engineering(IJERECE)

Monthly Journal for Electronics and Communication Engineering

Open Access Journal

International Journal of Engineering Research in Electronics and Communication Engineering(IJERECE)

Monthly Journal for Electronics and Communication Engineering
Call For Paper : Vol 11, Issue 03, March 2024

ISSN : 2394-6849 (Online)

Call for Paper

Vol 11, Issue 03, March 2024

Indexing

Study of Variation of Chromospheric Plages for the year 1917 from Ca-II K Spectroheliograms using Image Processing Tools

Author : Sree Raksha Gupta A R 1 M Ashwija Shetty 2 Anusha Muddappa Shirahatti 3 Sheena S Jaffer 4 R. Kariyappa 5 Priyanka K 6 Jagdev Singh 7

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Date of Publication :22nd June 2018

Abstract: The long-term synoptic observations in the resonance line of Ca-II K (singly ionized calcium) provides the basis for a fundamental database to a variety of retrospective analysis of the state of solar magnetism. The Ca-II K observations in Kodaikanal Solar Observatory (KSO) is extremely important as it provides a unique dataset in the world for the study of chromospheric activity and its variability as a function of the well-known solar magnetic 11-year cycle. It is known that Ca-II Kline is a very good indicator of chromospheric activity and variability of the Sun and Sun-like stars. The spectroheliograms will be used as a proxy for magnetic elements of the chromosphere i.e., the intensity of the chromospheric features is well correlated with the strength of the magnetic field associated with them. That means there is the one-to-one correspondence between the chromospheric emission features with underlying photospheric magnetic elements. In this paper, the digitized and calibrated Ca-II K spectroheliograms observed at KSO in the period 1917 is used for analysis. The paper proposed segments of the plages and derives their intensity and area. This helps in the estimation of the total contribution of plages to the variability of the chromosphere. Various image processing techniques for this analysis are implemented using MATLAB 2016a

Reference :

    1. J. J. Zender, R. Kariyappa, G. Giono, M. Bergmann, V. Delouille, L. Dame, J.-F. Hochedez and S. T. Kumara, ―Segmentation of photospheric magnetic elements corresponding to coronal features to understand the EUV and UV irradiance variability‖, Astronomy and astrophysics, Vol 605, A41, pp 1-11, June 2017.
    2. Muthu Priyal, Jagdev Singh, Ravindra Belur, SomaSundaram Kameshwaran Rathina, ― Long-term Variations in the Intensity of Plages and Networks as Observed in Kodaikanal Ca-K Digitized Data‖, Solar Physics, DOI 10.1007/s11207-017-1106-3, 19th June 2017.
    3. Priya .M. S, Dr. G. M. Kadhar Nawaz, ―Multilevel Image Thresholding using OTSU’s Algorithm in Image Segmentation", International Journal of Scientific & Engineering Research, Volume 8,Issue 5, May-2017 101 ISSN 2229-5518
    4. Er. Anjna, Er. Rajandeep Kaur, "Review of Image Segmentation Technique", International Journal of Advanced Research in Computer Science, volume 8, No. 4, May 2017 (Special Issue).
    5. Luca Beetello, Alexei Pevtsov, Andrey Tlatov, Jagdev Singh, ― Correlation Between Sunspot Number and Ca II K Emission Index‖, Solar Physics, DOI: 10.1007, 0:39 pp 1- 16, 3rd June 2016.
    6. Dilpreet Kaur, Yadwinder Kaur, "Various Image Segmentation Techniques: A Review", International Journal of Computer Science and Mobile Computing, Vol. 3, Issue. 5, May 2014, pg.809 – 814.
    7. S. Guttenbrunner, A. Hanslmeier, D. Utz, B. Lemmerer, I. Piantschitsch and S. Thonhofer, ―Solar Ca II K Plage regions as proxies for Magnetic Fields of Solar Like Stars‖, Cent. Eur. Astrophysics. Bull 38, pp 81-86, 2014.
    8. Mahmud S. Alkoffash, Mohammed J. Bawaneh, Hasan Muaidi, Shihadeh Alqrainy , Muath alzghool, "A Survey of Digital Image Processing Techniques in Character Recognition", IJCSNS International Journal of Computer Science and Network Security, VOL.14 No.3, March 2014.
    9. B. Ravindra, T. G. Priya, K. Amareshwari, M. Priyal, A. A.Nazia, D. Banerjee, ―Digitized archive of the Kodaikanal images: Representative results of solar cycle variation from Sunspot area determination‖, Astronomy & Astrophysics, December 3, 2013.
    10. Yinxiao Liu, aGuoyuan Liang, and Punam K. Saha, "A new multi-object image thresholding method based on correlation between object class uncertainty and intensity gradient", Medical Physics, volume 39 (1), January 2012
    11. A. Ortiz, M. Rast, ―How good is the Ca II K as a proxy for the magnetic flux?‖, Società Astronomica Italiana, Vol. 76, 2005
    12. John R. Worden, Oran R. White, Thomas N. Woods, ―Evolution of Chromospheric Structures derived from Ca II K Spectroheliograms: Implications for solar ultraviolet irradiance variability‖, The Astronomical Journal, vol 496, pp 998- 1014, April 1998.
    13. R. Kariyappa, J. M. Pap ,―Contribution of chromospheric features to UV irradiance variability from spatially-resolved Ca II K spectroheliograms‖, Solar physics, vol 167, issue 1-2, pp 115-123, August 1996.a
    14. Robert M Haralick, Linda G Shapiro, "Image Segmentation Techniques", Computer vision, graphics, and image processing 29 (1), 100-132, 1985.
    15. K. R. Sivaraman, W. Livingston, ―Ca II K2V spectral features and their relation to small-scale photospheric magnetic fields‖, Solar Physics, DOI: 10.1007/BF00147970, January 1982.

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