Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 40, issue 3
Articles | Volume 40, issue 3
https://doi.org/10.5194/angeo-40-271-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-40-271-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 40, issue 3
Regular paper
 | 
06 May 2022
Regular paper |  | 06 May 2022

Terrestrial exospheric dayside H-density profile at 3–15 RE from UVIS/HDAC and TWINS Lyman-α data combined

Jochen H. Zoennchen, Hyunju K. Connor, Jaewoong Jung, Uwe Nass, and Hans J. Fahr

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Cited articles

Bailey, J. and Gruntman, M.: Experimental study of exospheric hydrogen atom distributions by Lyman-α detectors on the TWINSmission, J. Geophys. Res., 116, A09302, https://doi.org/10.1029/2011JA016531, 2011. 
Bailey, J. and Gruntman, M.: Observations of exosphere variations during geomagnetic storms, Geophys. Res. Lett., 40, 1907–1911, https://doi.org/10.1002/grl.50443, 2013. 
Baliukin, I., Bertaux, J.-L., Quemerais, E., Izmodenov, V., and Schmidt, W.: SWAN/SOHO Lyman-α mapping: The hydrogen geocorona extends well beyond the Moon, J. Geophys. Res.-Space, 124, 861–885, https://doi.org/10.1029/2018JA026136, 2019. 
Beth, A., Garnier, P., Toublanc, D., Dandouras, I., and Mazelle, C.: Theory for planetary exospheres: II. Radiation pressure effect on exospheric density profiles, Icarus, 266, 423–432, https://doi.org/10.1016/j.icarus.2015.08.023, 2016. 
Bishop, J.: Geocoronal structure: The effect of solar radiation pressure and plasmasphere interaction, J. Geophys. Res., 90, 5235–5245, 1985. 
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Exospheric Ly-α observations of UVIS/HDAC at CASSINI on its Earth swing-by and TWINS are combined to derive the exospheric H-density profile of the ecliptic dayside between 3–15 RE. At 10 RE nH=35 cm−3 is found in the vicinity of the subsolar point for quiet space weather conditions. Also a faster radial fall of the dayside H density above 8 RE (r−3) compared to lower distances of 3–7 RE (r−2.37) is found and possibly indicates enhanced loss of H atoms near the magnetopause and beyond.
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