2015 Dec 28 1900 UTC Sunspot Group Classification Results Number of Detected Sunspot Groups : 2 Group Index : 1 Ratio of magnetic polarity (+/-) : 0.00842697 [ Z-Class Determination ] Number of spots : 2 Number of spots with penumbra : 0 Z-Class : B [ p-Class Determination ] p-Class : x [ c-Class Determination ] Number of spots : 2 Area ratio (spots/group) : 0.709677 Number of spots with penumbra : 0 c-Class :i McIntosh Class : Bxi [ Magnetic Class Determination ] Magnetic Class : Alpha Group Index : 2 Ratio of magnetic polarity (+/-) : 0.778467 Only one magnetic neutral line is found Roughness of the only magnetic neutral line : 2.17333 [ Z-Class Determination ] Number of spots : 13 Number of spots with penumbra : 5 Longitudinal extent of this spot group (deg) : 15.4188 Z-Class : F [ p-Class Determination ] Asymmetry factor of penumbral shape : 13.1906 (criterion : 25) N-S diameter of largest penumbra (deg) : 2.3940982 (criterion : 2.5 deg) Ratio of umbral area to spot area : 0.213115 p-Class : s [ c-Class Determination ] Number of spots : 13 Area ratio (spots/group) : 0.346505 Number of spots with penumbra : 5 c-Class :o McIntosh Class : Fso [ Magnetic Class Determination ] Magnetic Class : Beta-Gamma