Published in
Revista Brasileira de Geofísica, 1(33), p. 79
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The initial steps for developing the South American K index from the EMBRACE magnetometer network
Journal article published in 2015 by
C. M. De Nardini,
Clezio Marcos Denardini,
Marlos Rockenbach da Silva,
M. R. Da Silva,
Mauricio Alfredo Gende,
Sony Su Chen,
Paulo Roberto Fagundes,
Nelson Jorge Schuch,
Adriano Petry,
L. C. Araújo Resende,
Laysa Cristina Araujo Resende,
Juliano Moro,
Antonio Lopes Padilha 
,
Nilson Sant’Anna,
Livia Ribeiro Alves
,
Nilson Sant’Anna,
Livia Ribeiro Alves
Abstract
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.