Geophysics research on ISS Russian Segment

Relaksatsia Experiment


Investigation of chemiluminescent chemical reactions and atmospheric optical phenomena occurring during high-speed interaction between jet engine exhausts and the Earth's upper atmosphere, atmospheric optical phenomena during re-entry of bodies into rarified upper atmosphere and its optical properties in the UV range.


Conducting radiometric and spectrometric measurements in the UV range:

  • Radiation emitted in reactions of interaction between ISS RS propulsion system exhaust products and atomic oxygen;
  • Radiation emitted in reactions of interaction of Soyuz and Progress propulsion system exhaust products during undocking maneuvers, retroburns and re-entry into the Earth's upper atmosphere;
  • Spacial distribution and emission spectra of atmospheric formations and phenomena.

Science Hardware Used:

"Fialka-MV-Kosmos multispectral UV system which includes:

  • UV camera
  • Spectrometer
  • Video camera
  • A set of interference filters


  • Mini-DV video tapes
  • Diskettes

Expected Results:

Determining the effects of propulsion system exhausts on the Earth upper atmosphere and ISS environment, on optically sensitive surfaces (windows, equipment lenses, solar array panels). In perspective, simulation of atmospheric optical phenomena in ultra-violet, visible and near-infrared spectral bands (Earth atmosphere nightglow, SC re-entry glow, planetary atmospheric glow).

ISS Crew

Shannon Walker WALKER

leg Novitskiy Novitskiy

Petr Dubrov Dubrov

Mark Vande Hei Vande Hei

Michael Hopkins Hopkins

Victor Glover Glover

Soichi Noguchi Noguchi