The Space Science and Engineering Center (SSEC) Portable Atmospheric Research Center, also known as the SPARC, is a specially designed vehicle outfitted with instruments that make ground-based measurements used for studying the atmosphere.

Based at the University of Wisconsin-Madison, the SPARC has an extensive suite of instruments, including an Atmospheric Emitted Radiance Interferometer (AERI), a High Spectral Resolution Lidar (HSRL), a Surface Meteorology (SurfaceMet) station, a WindPro lidar system, and a radiosonde receiving station

The SPARC is an upgraded version of the AERIbago, SSEC's previous mobile lab, which was retired after 20 years of service.
The SPARC during the Plains Elevated Convection At Night (PECAN) field experiment. Credit: Tim Wagner, SSEC.