EGU General Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Key Results from the Emirates Ultraviolet Spectrometer on the Emirates Mars Mission

Michael Chaffin1, Hoor Almazmi2, Krishnaprasad Chirakkil1,3, John Correira4, Justin Deighan1, Scott England5, J. Scott Evans4, Matthew Fillingim6, Greg Holsclaw1, Sonal Jain1, Rob Lillis6, Fatma Lootah7, Susarla Raghuram1,3, and Hessa Al Matroushi7
Michael Chaffin et al.
  • 1Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States of America (
  • 2UAE Space Agency, Abu Dhabi, United Arab Emirates
  • 3Space and Planetary Science Center, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
  • 4Computational Physics, Incorporated, Springfield, VA, United States of America
  • 5Virginia Polytechnic Institute and State University, Blacksburg, VA, United States of America
  • 6Space Sciences Laboratory, University of California, Berkeley, CA, United States of America
  • 7Mohammed Bin Rashid Space Centre, Dubai, United Arab Emirates

The Emirates Mars Ultraviolet Spectrometer (EMUS) instrument is one of three science instruments on board the “Hope Probe” of the Emirates Mars Mission (EMM). EMM arrived at Mars on February 9 2021, in order to explore the global dynamics of the Martian atmosphere, while sampling on both diurnal and seasonal timescales. The EMUS instrument is a far-ultraviolet imaging spectrograph, jointly developed by the Mohammed Bin Rashid Space Centre (MBRSC) in Dubai, UAE and the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado Boulder, which measures emissions in the spectral range 100-170 nm. Using a combination of its one-dimensional imaging and spacecraft motion, it makes two-dimensional far-ultraviolet images of the Martian disk and near-space environment including the Lyman beta and alpha atomic hydrogen emissions (102.6 nm and 121.6 nm), two atomic oxygen emissions (130.4 nm and 135.6 nm), and the carbon monoxide fourth positive group band emission (140-170 nm). Measurements of radiance at these wavelengths are used to derive the column abundance of atomic oxygen and carbon monoxide in the Martian thermosphere, and the density of atomic oxygen and atomic hydrogen in the Martian exosphere both with spatial and sub-seasonal variability. We will present a survey of results from EMM/EMUS including observed variability in atomic oxygen and carbon monoxide emission, two kinds of aurora, and the status of atmospheric retrievals.

How to cite: Chaffin, M., Almazmi, H., Chirakkil, K., Correira, J., Deighan, J., England, S., Evans, J. S., Fillingim, M., Holsclaw, G., Jain, S., Lillis, R., Lootah, F., Raghuram, S., and Al Matroushi, H.: Key Results from the Emirates Ultraviolet Spectrometer on the Emirates Mars Mission, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-10731,, 2022.