Geomagnetism and Aeronomy

, Volume 58, Issue 8, pp 1187–1191 | Cite as

On the Dependence of the Solar Wind Velocity on the Fractional Area of Coronal Holes in Longitude

  • Z. S. AkhtemovEmail author
  • Yu. T. Tsap


The relationship between the fractional area of coronal holes and the maximum velocity of the fast solar wind at 1 AU based on AIA/SDO and ACE/SWEPAM observations is considered for the period from June 2015 to March 2017. Assuming the ballistic model of the solar wind propagation it has been shown that the coronal holes within the meridional slice ±10° make a basic contribution to the ecliptic solar wind. The maximum correlation coefficient between the area of coronal holes and the peak solar wind velocity at latitudes within ±40° was found to be equal to 0.762 ± 0.145. The probable causes of the discrepancy between the predicted and observed values of the solar wind velocity are discussed.


  1. 1.
    Abramenko, V.I., Yurchyshyn, V.B., and Watanabe, H., Parameters of the magnetic flux inside coronal holes, Sol. Phys., 2009, vol. 260, pp. 43–57.CrossRefGoogle Scholar
  2. 2.
    Akhtemov, Z.S. and Tsap, Yu.T. On the dependence of the solar wind velocity on the area of coronal holes in latitude, Astron. Astrophys. Trans., 2019 (in press).Google Scholar
  3. 3.
    Akiyama, S., Gopalswamy, N., Yashiro, S., and Makela, P., A study of coronal holes observed by SOHO/EIT and the Nobeyama radioheliograph, Publ. Astron. Soc. Jpn., 2013, vol. 65, pp. S15-1–S15-10.Google Scholar
  4. 4.
    Cranmer, S.R., Coronal holes and the high speed solar wind, Space Sci. Rev., 2002, vol. 101, pp. 229–294.CrossRefGoogle Scholar
  5. 5.
    Cranmer, S.R., Coronal holes, Living Rev. Sol. Phys., 2009, vol. 6, id 3.Google Scholar
  6. 6.
    Eselevich, V.G., Kaigorodov, A.P., and Fainshtein, V.G., Some peculiarities of solar plasma flows from coronal holes, Planet Space Sci., 1990, vol. 38, pp. 459–469.CrossRefGoogle Scholar
  7. 7.
    Fujiki, K., Hirano, M., Kojima, M., Tokumaru, M., Baba, D., Yamashita, M., and Hakamada, K., Relation between solar wind velocity and properties of its source region, Adv. Space Res., 2005, vol. 35, pp. 2185–2188.CrossRefGoogle Scholar
  8. 8.
    Garton, T.M., Gallagher, P.T., and Murray, S.A., Automated coronal hole identification via multi-thermal intensity segmentation, J. Space Weather Space Clim., 2018 vol. 8, id.A02.Google Scholar
  9. 9.
    Hegde, M., Hiremath, K.M., Doddamani, V.H., and Gurumath, S.R., Solar wind associated with near equatorial coronal hole, J. Astrophys. Astron., 2015, vol. 36, pp. 355–374.CrossRefGoogle Scholar
  10. 10.
    Krieger, A.S., Timothy, A.F., and Roelof, E.C., A Coronal hole and its identification as the source of a high velocity solar wind stream, Sol. Phys., 1973, vol. 29, pp. 505–525.CrossRefGoogle Scholar
  11. 11.
    Luo, B., Zhong, Q., and Liu, S., and Gong, A new forecasting index for solar wind velocity based on EIT 284 Å observations, Sol. Phys., 2008, vol. 250, pp. 159–170.CrossRefGoogle Scholar
  12. 12.
    Nolte, J.T. and Roelof, E.C., Large-scale structure of the interplanetary medium. I: high coronal source longitude of the quiet-time solar wind, Sol. Phys., 1973, vol. 33, pp. 241–257.CrossRefGoogle Scholar
  13. 13.
    Nolte, J.T., Krieger, A.S., Timothy, A.F., Gold, R.E., Roelof, E.C., Vaiana, G., Lazarus, A.J., and Sullivan, J.D., Coronal holes as sources of solar wind, Sol. Phys., 1976, vol. 46, pp. 303–322.CrossRefGoogle Scholar
  14. 14.
    Obridko, V.N., Shelting, B.D., Livshits, I.M., and Asgarov, A.B., Contrast of coronal holes and parameters of associated solar wind streams, Sol. Phys., 2009, vol. 260, pp. 191–2016.CrossRefGoogle Scholar
  15. 15.
    Rotter, T., Veronig, A.M., Temmer, M., and Vrsnak, B., Relation between coronal hole areas on the Sun and the solar wind parameters at 1 AU, Sol. Phys., 2012, vol. 281, pp. 793–813.CrossRefGoogle Scholar
  16. 16.
    Shugai, Yu.S., Veselovsky, I.S., and Trichtchenko, L.D., Studying correlations between the coronal hole area, solar wind velocity, and local magnetic indices in the Canadian Region during the decline phase of cycle 23, Geomagn. Aeron. (Engl. Transl.), 2009, vol. 49, no. 4, pp. 415–424.Google Scholar
  17. 17.
    Shugay, Yu.S., Veselovsky, I.S., Slemzin, V.A., Yermolaev, Yu.I., and Rodkin, D.G., Possible causes of the discrepancy between the predicted and observed parameters of high-speed solar wind streams, Cosmic Res., 2017, vol. 55, no. 1, pp. 20–29.CrossRefGoogle Scholar
  18. 18.
    Tlatov, A., Tavastsherna, K., and Vasil’eva, V., Coronal holes in solar cycles 21 to 23, Sol. Phys., 2014, pp. 1349–1358.Google Scholar
  19. 19.
    Vrsnak, B., Temmer, M., and Veronig, A.M., Coronal holes and solar wind high-speed streams: I. Forecasting the solar wind parameters, Sol. Phys., 2007, vol. 240, pp. 315–330.CrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Crimean Astrophysical Observatory of the Russian Academy of SciencesCrimeaRussia
  2. 2.Pulkovo Observatory of the Russian Academy of SciencesSt. PetersburgRussia

Personalised recommendations