1. Abunina M, Abunin A, Belov A, Gaidash S, Tassev Y, Velinov P, Mateev L, Tonev P (2013) Geoeffectivity of solar coronal holes with different magnetic field polarity, Bulgarian Academy of Sciences. Space Research and Technology Institute. Aerosp Res Bulg 25:70–77
2. Abunina M, Abunin A, Belov A, Eroshenko E, Gaidash S, Oleneva V, Yanke V, Kryakunova O (2015) On the influence of the coronal hole latitude and polarity on the geomagnetic activity and cosmic ray variations. In: Proceeding of Science, The 34th International Cosmic Ray Conference, 082
3. Akiyama S, Gopalswamy N, Yashiro S, Mäkelä P (2013) A study of coronal holes observed by SOHO/EIT and the Nobeyama radioheliograph. Publ Astron Soc Jpn 65:S15.
https://doi.org/10.1093/pasj/65.sp1.s15
4. Altrock RC (2014) Forecasting the maxima of solar cycle 24 with coronal Fe xiv emission. Sol Phys 289:623–629
5. Alves MV, Echer E, Gonzalez WD (2006) Geoeffectiveness of corotating interaction regions as measured by Dst index. J Geophys Res 111:A07S05.
https://doi.org/10.1029/2005ja011379