Skip to main content
SpringerLink
Log in

Flux Variations in Lines of Solar EUV Radiation beyond Flares in Cycle 24

  • Published:
Geomagnetism and Aeronomy Aims and scope Submit manuscript

Abstract

Studies in the extreme ultraviolet (EUV) and X-ray ranges of the solar spectrum are important due to the active role of radiation of these ranges in the formation of the Earth’s ionosphere. Photons of the EUV range are completely absorbed in the upper layers of the Earth’s atmosphere and induce the excitation, dissociation, and ionization of its different components and, finally, atmospheric heating. From the archive data of the EUV Variability Experiment of the Solar Dynamics Observatory (SDO/EVE), we formed series of diurnal values of the background fluxes radiated beyond flares in the EUV lines HeII (30.4 nm), HeI (58.4 nm), CIII (97.7 nm), and FeXVIII (9.4 nm) in cycle 24 (from 2010 to 2017). These fluxes are compared to the corresponding values of the radio flux F10.7 at a wavelength of 10.7 cm and the background radiation flux F0.1−0.8 in the X-ray range between 0.1 and 0.8 nm measured onboard the GOES-15 satellite of the Geostationary Operational Environmental Satellite system. Comparative analysis has shown that the solar radiation in individual lines of the EUV range and the fluxes F10.7 and F0.1−0.8 are closely interrelated.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.
Fig. 7.
Fig. 8.
Fig. 9.

Similar content being viewed by others

REFERENCES

  1. Benz, A.O., Flare observations, Living Rev. Sol. Phys., 2017, vol. 14, id 2.

  2. Bruevich, E.A. and Yakunina, G.V., The cyclic activity of the sun from observations of the activity indices at different time scales, Moscow Univ. Phys. Bull., 2015, vol. 70, no. 4, pp. 282–290.

    Article  Google Scholar 

  3. Didkovsky, L. and Wieman, S., Ionospheric total electron contents (TECs) as indicators of solar EUV changes during the last two solar minima, J. Geophys. Res.: Space, 2014, vol. 119, pp. 4175–4184.

    Article  Google Scholar 

  4. Hinrichs, J., Bothmer, V., Mrotzek, N., et al., Impacts of space weather effects on the ionospheric vertical Total Electron Content, in Proc. EGU General Assembly, 17–22 April 2016, Vienna, Austria, 2016, id EPSC2016-7375.

  5. Ivanov-Kholodnyi, G.S. and Nikol’skii, G.M., Solntse i ionosfera (The Sun and the Ionosphere), Moscow: Nauka, 1969.

  6. Ivanov-Kholodnyi G.S. and Nusinov, A.A., Shortwave solar radiation and its influence on the upper atmosphere and ionosphere, Itogi Nauki Tekh., Ser. Issled. Kosm. Prostranstva, 1987, vol. 26, pp. 80–154.

    Google Scholar 

  7. Jee, G., Lee, H., and Solomon, S.C., Global ionospheric total electron contents (TECs) during the last two solar minimum periods, J. Geophys. Res.: Space, 2014, vol. 119, pp. 2090–2100.

    Article  Google Scholar 

  8. Kockarts, G., Effects of solar variations on the upper atmosphere, Sol. Phys., 1981, vol. 74, pp. 295–320.

    Article  Google Scholar 

  9. Lean, J., Solar ultraviolet irradiance variations. A review, J. Geophys. Res., 1987, vol. 92, pp. 839–868.

    Article  Google Scholar 

  10. Lemen, J.R., Title, A.M., Akin, D.J., et al., The Atmospheric Imaging Assembly (AIA) on The Solar Dynamics Observatory (SDO), Sol. Phys., 2012, vol. 275, pp. 17–40.

    Article  Google Scholar 

  11. Makarova, E.A., Kharitonov, A.V., and Kazachevskaya, T.V., Potok solnechnogo izlucheniya (Solar Radiation Flux), Moscow: Nauka, 1991.

  12. Peterson, L.E. and Winckler, J.R., Gamma-ray burst from a solar flare, J. Geophys. Res., 1959, vol. 64, pp. 697–708.

    Article  Google Scholar 

  13. Roble, R.G., Dynamics of the earth’s thermosphere, Rev. Geophys. Space Phys., 1983, vol. 21, pp. 217–233.

    Article  Google Scholar 

  14. Rottman, G.J., Observations of solar UV and EUV variability, Adv. Space Res., 1988, vol. 8, pp. 53–66.

    Article  Google Scholar 

  15. Schmidtke, G., Bursken, N., and Sunder, G., Variability of solar EUV fluxes and exospheric temperatures, J. Geophys. Res., 1981, vol. 49, pp. 146–148.

    Google Scholar 

  16. Simon, P.C., Solar irradiance between 120 and 400 nm and its variations, Sol. Phys., 1981, vol. 74, pp. 273–291.

    Article  Google Scholar 

  17. Solomon, S.C., Solar soft X-rays and the ionosphere E‑region problem, in American Geophysical Union. Fall General Assembly, 2016, id SH11D-02.

  18. Solomon, S.C., Qian, L., and Burns, A.G., The anomalous ionosphere between solar cycles 23 and 24, J. Geophys. Res.: Space, 2013, vol. 118, pp. 6524–6535.

    Article  Google Scholar 

  19. Tapping, K.E., The 10.7 cm solar radio flux (F10.7), Space Weather, 2013, vol. 11, pp. 394–406. https://doi.org/10.1002/swe.20064

    Article  Google Scholar 

  20. Woods, T.N., Recent advances in observations and modeling of the solar ultraviolet and X-ray spectral irradiance, Adv. Space Res., 2008, vol. 42, pp. 895–902.

    Article  Google Scholar 

  21. Woods, T., Eparvier, F., Hock, R., et al., First light results from the SDO Extreme Ultraviolet Variability Experiment (EVE), in 38th COSPAR Scientific Assembly, Bremen, Germany, 2010, pp. 8–11.

  22. Woods, T.N., Eparvier, F.G., Hock, R., et al., Extreme Ultraviolet Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO): Overview of science objectives, instrument design, data products, and model developments, Sol. Phys., 2012, vol. 275, pp. 115–143.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Sternberg Astronomical Institute, Moscow State University, 119991, Moscow, Russia

    E. A. Bruevich & G. V. Yakunina

Authors
  1. E. A. Bruevich
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. G. V. Yakunina
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding authors

Correspondence to E. A. Bruevich or G. V. Yakunina.

Additional information

Translated by E. Petrova

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Bruevich, E.A., Yakunina, G.V. Flux Variations in Lines of Solar EUV Radiation beyond Flares in Cycle 24. Geomagn. Aeron. 59, 155–161 (2019). https://doi.org/10.1134/S0016793219020038

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0016793219020038

Search

Navigation