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Astrophysics

, Volume 61, Issue 2, pp 241–253 | Cite as

Powerful Solar Flares in September 2017. Comparison with the Largest Flares in Cycle 24

Article

Solar flare activity in cycle 24 is studied. Satellite observations of x-ray fluxes from GOES-15 and UV emission lines from the SDO/EVE experiment are used. The most powerful flares of cycle 24 in classes X9.3 and X8.2 in September 2017 are compared with powerful flares in classes M5-X6.9. The times at which the fluxes in the 30.4 and 9.4 nm lines and in the 0.1-0.8 nm x-ray range begin to increase are compared for 21 of the large flares. The total energies arriving at the earth from flares in the 30.4 and 9.4 nm lines and in the 0.1-0.9 nm x-ray range, E30.4, E9.4, and E0.1-0.8, from 25 flares during 2011 and 2012 are calculated. It is shown that the calculated energies of the flares in the analyzed lines from SDO/EVE and in the x-ray range from GOES-15 are closely interrelated.

Keywords

sun cycle 24 activity flares development of flares in lines total flare energy 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.P. K. Shternberg State Astronomical Institute, M. V. Lomonosov Moscow State UniversityMoscowRussia

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