The following plot shows the residual of magnetic low resolution data (MAGx_LR, 1Hz) with respect to the CHAOS-7 Geomagnetic Field Model for the last 24 hours. Data and model have been downloaded via Jupyter-based Virtual Reseach Environment for the three Swarm satellites Swarm A (top panel), Swarm B (mid panel) and Swarm C (bottom panel). Color coded are the residual of absolute magnetic field F (black) and the residuals for the three vector components North (red), East (green) and Center (blue) in North-East-Center frame (NEC), that is an Earth-centred, Earth-fixed frame.
 

Swarm Mission on ESA web site

Swarm

• is ESA's first constellation for Earth Observation (EO). The mission consists of three identical satellites named Alpha, Bravo, and Charlie (A, B and C), which were launched on 22 November 2013 into a near-polar orbit
• is operated by ESA's European Space Operations Centre (ESOC in Germany) via the primary ground station in Kiruna (Sweden)
• initial constellation was achieved on 17 April 2014. The lower pair, Swarm A and C, fly side-by-side (longitudinal separation of 1.4° at the equator) at about 470 km altitude (87.3° inclination angle) and Swarm B at about 520 km altitude (87.7° inclination angle)
• lower pair, Swarm A and C, were manoeuvred so that their longitudinal separation reduced from 1.4° to 0° during October 2019-2021. The A and C separation stopped at -1.4° in August 2023

ESA Swarm Mission Instrumentation web site

The Swarm payload consists of the Vector Field Magnetometer (VFM), Absolute Scalar Magnetometer (ASM), Star Tracker (STR), Electric Field Instrument (EFI), Accelerometer (ACC) and GPS Receiver (GPSR). The Swarm's core instrument is VFM, which makes high-precision measurements of the magnitude and direction of the magnetic field. The precise satellite orientation and attitude in space are retrieved by STR. Onboard VFM is calibrated using scalar measurements from ASM, which measure magnetic field strength. EFI consists of two components: the Langmuir Probe and the Thermal Ion Imager. ACC measures the non-gravitational acceleration of the satellite in its respective orbit.
 

ESA Swarm FAST L1B data web site

1. From November 2023, some datasets can be obtained more quickly for space weather monitoring purposes through the "FAST" processing chain in contrast to the standard "Operational" chain
2. Daily Operational L1b and L2 datasets are available with a delay of 3 and 5 days, respectively
3. FAST (Fast-Track) L1b datasets are available at least 2-times per day: 2 passes per satellite per day