Fig. 2.From: The Ionospheric Bubble Index deduced from magnetic field and plasma observations onboard SwarmAn example of Bubble Index 0 and Bubble Flag 0 (Quiet). Each panel from top to bottom represents (a) residual strength, (b) filtered residual strength, (c) filtered/rectified residual strength, (d) plasma density, (e) filtered plasma density, and (f) Bubble Index and Bubble Probability, respectively.Back to article page