Discovery of a proton aurora at Mars

  title={Discovery of a proton aurora at Mars},
  author={Justin I. Deighan and S. K. Jain and Michael Scott Chaffin and Xiaoliang Fang and Jasper S. Halekas and John T. Clarke and N. Schneider and A. Ian F. Stewart and J-Y. Chaufray and J. Scott Evans and Michael H. Stevens and Majd Mayyasi and Arnaud Stiepen and Matteo Crismani and William E. McClintock and Gregory M. Holsclaw and Daniel Y. Lo and Franck Montmessin and Franck Lef{\'e}vre and Bruce M. Jakosky},
  journal={Nature Astronomy},
Proton aurorae are a distinct class of auroral phenomena caused by energetic protons precipitating into a planetary atmosphere. The defining observational signature is atomic hydrogen emissions from the precipitating particles after they obtain an electron from the neutral atmospheric gas, a process known as charge exchange. Until now, proton aurorae have been observed at Earth only. Here, we present evidence of auroral activity driven by precipitating protons at Mars, using observations by the… 
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