The initial steps for developing the South American K index from the embrace magnetometer network

DE NARDINI, CLEZIO MARCOS; DA SILVA, MARLOS ROCKENBACH; GENDE, MAURICIO ALFREDO; CHEN, SONY SU; FAGUNDES, PAULO ROBERTO; SCHUCH, NELSON JORGE; PETRY, ADRIANO; ARAÚJO RESENDE, LAYSA CRISTINA; MORO, JULIANO; PADILHA, ANTONIO LOPES; SANT?ANNA, NILSON; ALVES, LIVIA RIBEIRO

REVISTA BRASILEIRA DE GEOFíSICA

Sociedade Brasileira de Geofisica

Año: 2015 vol. 33 p. 79 - 88

0102-261X

In this paper we present the first steps given towards the development of the South American K index (Ksa) based on the measurements made by the Embrace Magnetometer Network. We present: (a) a description of the magnetometer and of the network; (b) the procedure used to calibrate the network equipments; (c) the procedure to obtain each station K scale and its corresponding upper limits of ranges for the three-hour-range station K index (thereafter referred as K9 threshold); and (d) some particularities regarding the Quiet Day Curve (QDC) deviation and its long term variation.