Dipartimento di Fisica e Astronomia"Ettore Majorana";
Universitàdi Catania;
Via S.Sofia 78;
195123 Catania;
Italy;
INAF Osservatorio Astrofisico di Catania;
Via S.Sofia 78;
1-95123 Catania;
Italy;
INAF Osservatorio Astronomico di Roma;
Via Frascati 33;
1-00078 Monte Porzio Catone;
Italy;
Department of Physics;
Aberystwyth University;
Ceredigion;
Cymru;
SY233BZ;
UK;
Department of Astronomy;
E?tv?s Loránd University;
Pazmany P.setany 1/A;
Budapest;
H-l 117;
Hungary;
Solar Physics&Space Plasma Research Center(SP2RC);
School of Mathematics and Statistics;
University of Sheffield;
Hicks Building;
Hounsfield Road;
S37RH;
UK;
Gyula Bay Zoltán Solar Observatory(GSO);
Hungarian Solar Physics Foundation(HSPF);
etofi ter 3.;
Gyula;
H-5700;
Hungary;
Sun:magnetic fields; Sun:photosphere; Sun:sunspots; Sun:flares; Sun:activity;