Fig. 1.From: The Ionospheric Bubble Index deduced from magnetic field and plasma observations onboard SwarmIllustration of the different processing steps for EPB detection: (a) residual strength, (b) filtered residual strength, (c) filtered/rectified residual strength, (d) plasma density, (e) filtered plasma density, (f) Bubble Index and Bubble Probability, and (g) scatter plot of filtered residual strength and filtered plasma density for the widest EPB in panel (f).Back to article page