Skip to main content
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Spatial gradients of geomagnetic temporal variations causing the instability of inter-station transfer functions

Fig. 4

Results obtained by applying MC-NMF to the geomagnetic spectrograms from three observatories. a Basis vectors included in the data with x (upper) and y (lower) directions at KAK (left), at KNY (middle), and at MMB (right). The vertical axis denotes frequencies and the horizontal axis denotes IDs of Basis vectors. b Activations. The vertical axis denotes IDs of Activations (same as Basis vectors) and the horizontal axis denotes time window number. c\({\text{BR}}\) with x (upper) and y (lower) directions at KAK (left), at KNY (middle), and at MMB (right). The vertical axis denotes frequencies and the horizontal axis denotes IDs of Basis vectors

Back to article page