Spaceweather Products
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Swarm Ionospheric Bubble Index (IBI) - Product description and access

Swarm Ionospheric Bubble Index (IBI) provides information on bubble climatology itself as well as on disturbance level of magnetic field data by combining electron density and magnetic field observations. Bubbles (low-latitude post sunset plasma irregularities) are an intrinsic regular phenomenon in the F-region ionosphere that leaves severe plasma density gradients, magnetic field variations and causes GPS signal scintillations.

The IBI is indexed as follows:

Swarm IBI is provided as Level 2 (L2) data product with a 1Hz cadence by ESA’s Earth’s Observation program. The data are provided in daily files in CDF format (Swarm L2 product format). The product names are IBIxTMS_2F, with x = A, B, C for the 3 satellites respectively.

More information can be found here:
Swarm L2 product definition
and
Swarm L2 IBI product description

Swarm IBI data and metadata (XML Header file having extension .HDR: more information) are available at (ESA EO Single Sign-On registration is required: more information)
Swarm IBIxTMS_2F data