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Long-Term Density Trend in the Mesosphere and Lower Thermosphere From Occultations of the Crab Nebula With X-Ray Astronomy Satellites

Katsuda, Satoru; Enoto, Teruaki; Sato, Kosuke +9 more

We present long-term density trends of the Earth's upper atmosphere at altitudes between 71 and 116 km, based on atmospheric occultations of the Crab Nebula observed with X-ray astronomy satellites, ASCA, RXTE, Suzaku, NuSTAR, and Hitomi. The combination of the five satellites provides a time period of 28 years from 1994 to 2022. To suppress seaso…

New Measurement of the Vertical Atmospheric Density Profile From Occultations of the Crab Nebula With X Ray Astronomy Satellites Suzaku and Hitomi

Katsuda, Satoru; Sato, Kosuke; Tashiro, Makoto S. +6 more

We present new measurements of the vertical density profile of the Earth's atmosphere at altitudes between 70 and 200 km, based on Earth occultations of the Crab Nebula observed with the X ray Imaging Spectrometer onboard Suzaku and the hard X ray Imager onboard Hitomi. X ray spectral variation due to the atmospheric absorption is used to derive t…