TRACKING H-ALFA INDEXES CYCLE 24 FROM
OAG OBSERVATIONS

______________________________________________________________________________________________________________________

Tracking of the 24th solar activity cycle according to the daily T.Tobal (OAG) monitoring

Three indexes are shown: limb prominences, filaments and  cromospheric faculae. Graphic obtained from visual observations between 2080 to 2113 Carrington Rotations (2009 -2011). For calculation and classification of H-Alfa Indexes see Volker (1995) and Tobal (2009).

_______________________________________________________________________________________________________________________

revised: september 2011