Swarm Ionospheric Polar Electrodynamics (Swipe)
Swipe is a combination of two models, AMPS and Hi-C. See further details
below.
Swipe is a combination of two models, AMPS and Hi-C. See further details
below.
The Average Magnetic field and Polar current System (AMPS) model is an empirical model of the ionospheric current system and associated magnetic field. The model magnetic field and currents are continuous functions of solar wind velocity, the interplanetary magnetic field, the tilt of the Earth's dipole magnetic field with respect to the Sun, and the 10.7 cm solar radio flux index F10.7. Given these parameters, model values of the ionospheric magnetic field can be calculated anywhere in space, and, with certain assumptions, on ground. The full current system, horizontal + field-aligned, are defined everywhere in the polar regions. The model is based on magnetic field measurements from the low Earth orbiting Swarm and CHAMP satellites.
The Swarm Hi-C model high-latitude ionospheric convection is a function of the same input parameters used for the AMPS model. Given these parameters, model values of the high-latitude ionospheric convection, potential, and electric field can be calculated. The model is based on ion drift measurements from Swarm A and Swarm C.
The Swarm Ionospheric Polar Electrodynamics (Swipe) model is an empirical model of high-latitude ionospheric electrodynamics, obtained from combining outputs from the AMPS and Swarm Hi-C models. Modeled quantities include height-integrated electromagnetic work, Poynting flux, Pedersen conductance, Hall conductance, and Cowling conductance. The Swipe conductance products available here are masked based on three criteria: (i) electromagnetic work < 0.5 mW/m²; (ii) Hall conductance < 0.05 mho; (iii) Hall conductance > 100 mho. In any bin where any of these criteria are not met, the conductance is grayed out. For control over these threshold criteria, one may alternatively visit the Swipe implementation at " NASA CCMC Instant Run", or install and run the Swipe python implementation, pyswipe (see "More information" below).
The dropdown menus allow you to choose which output quantity to display in each map, and which hemisphere to show. When loading the site, the most recent solar wind conditions are used, taken from the NOAA Space Weather Prediction Center. The time series plot shows the conditions during the previous 24 hours. Click the plot to choose a different time. You can also change the external conditions directly by adjusting the sliders or click the compass plot of the interplanetary magnetic field GSM yz-plane. When changing the input values directly, the coastlines disappear. This is because, without a specific time and date, the orientation of the coastlines is ambiguous. To compare different conditions, you can get individual controls for each map by deselecting "shared controls". To get a pdf version of a map, click the download link.
Exact information about how the models are defined can be found in the
following papers. We kindly ask that you cite these paper if you use the
maps in publications.
Laundal, K. M., Finlay, C. C., Olsen, N., & Reistad, J. P. (2018). Solar
wind and seasonal influence on ionospheric currents from Swarm and CHAMP
measurements. Journal of Geophysical Research: Space Physics, 23,
4402–4429. https://doi.org/10.1029/2018JA025387.
Hatch, S. M., Vanhamäki, H., Laundal, K. M., Reistad, J. P., Burchill,
J. K., Lomidze, L., Knudsen, D. J., Madelaire, M., & Tesfaw, H. (2024).
Does high-latitude ionospheric electrodynamics exhibit hemispheric
mirror symmetry? Annales Geophysicae, 42(1), 229–253. 10.5194/angeo-42-229-2024.
To get numeric output, or make plots with other settings than offered
here, please use the Python forward code for the AMPS model, pyAMPS and
for the Swipe model, pyswipe. pyAMPS and pyswipe allows you to calculate
all model output for any set of external conditions, at any coordinate.
This page is based on pyAMPS and pyswipe. The python implementations are
available as open source packages at
pyAMPS
and
pyswipe. More information about the
Swipe project can be found "
here
".
This website was developed with the support from ESA through Swarm DISC.
It was coded by Karl Laundal, Spencer Hatch, Fasil Kebede and Brage Førland.
For questions or comments, please contact
Fasil Kebede.
Our privacy policy for users of webSwipe is simple: no data shared with us will be given to any third party, under any circumstances. Your data will also never be used by us for any purpose without specific permission. webSwipe engages in no ad targeting, data mining, or other activities that may compromise your privacy, and we do not affiliate ourselves with any third parties that do so.
