John T. Clarke (born 1952) is a professor of astronomy and director of the Center for Space Physics at Boston University.
Clarke is best known for his Hubble Space Telescope observations of the aurora on Jupiter and Saturn, as well as over 260 papers in refereed journals, including every planet except Mercury and the interplanetary medium.
At present this includes primarily observations with the Hubble Space Telescope, overseeing the echelle channel on the MAVEN IUVS instrument orbiting Mars, and as Deputy-PI for the upcoming GLIDE mission to image the Earth's geocorona.
[2] His thesis involved far-ultraviolet observations of Jupiter and Saturn using the IUE satellite and a sounding rocket, including the aurora and day glow on both planets and the Io plasma torus.
[1] Clarke began his career in 1980 as an Assistant Research Physicist at the space sciences laboratory at the University of California, Berkeley.