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Solar Wind Associated with Near Equatorial Coronal Hole

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Abstract

Present study probes temporal changes in the area and radiative flux of near equatorial coronal hole associated with solar wind parameters such as wind speed, density, magnetic field and temperature. Using high temporal resolution data from SDO/AIA for the two wavelengths 193 Å and 211 Å, area and radiative flux of coronal holes are extracted and are examined for the association with high speed solar wind parameters. We find a strong association between different parameters of coronal hole and solar wind. For both the wavelength bands, we also compute coronal hole radiative energy near the earth and it is found to be of similar order as that of solar wind energy. However, for the wavelength 193 Å, owing to almost similar magnitudes of energy emitted by coronal hole and energy due to solar wind, it is conjectured that solar wind might have originated around the same height where 193 Å line is formed in the corona.

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Acknowledgements

This work has been carried out under ‘CAWSES India Phase-II program of Theme 1’ sponsored by Indian Space Research Organization (ISRO), Government of India. The AIA data used here is the courtesy of SDO (NASA) and AIA consortium. The authors are thankful to the anonymous referee for useful comments that improved the manuscript substantially. The authors are also thankful to H. Tian for sending the code for calculating azimuthal angle.

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Authors and Affiliations

  1. Indian Institute of Astrophysics, Bengaluru, 560 034, India

    M. Hegde & K. M. Hiremath

  2. Department of Physics, Bangalore University, Bengaluru, 560 056, India

    M. Hegde & Vijayakumar H. Doddamani

  3. School of Advanced Studies, VIT University, Vellore, 632 014, India

    Shashanka R Gurumath

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  1. M. Hegde
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  2. K. M. Hiremath
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  3. Vijayakumar H. Doddamani
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  4. Shashanka R Gurumath
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Correspondence to M. Hegde.

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Hegde, M., Hiremath, K.M., Doddamani, V.H. et al. Solar Wind Associated with Near Equatorial Coronal Hole. J Astrophys Astron 36, 355–374 (2015). https://doi.org/10.1007/s12036-015-9338-9

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