May 2024 - Infrared Radiation in the Thermosphere from 2002-2023. Reference: M.G. Mlynczak et al. (2024), Infrared Radiation in the Thermosphere from 2002-2023, to be published in Geophysical Research Letters.

Supporting-Information-File.txt



Thermospheric CLimate Index from 2002-2023.


September 2022 - SABER observations of water vapor injected by Hunga Tonga.


Altitude vs. time water mixing ratio (ppmv) for 20S latitude through July 2022. The red vertical line marks the eruption on January 14, 2022.


August 2022 - SABER measurements of the MLT show that it has significantly cooled and contracted between the years 2002 and 2020. This is due to a combination of a decline in the intensity of the 11-year solar cycle and increasing CO2. A paper has been submitted to GRL.


Change in the global annual mean geopotential height (GPH, m) from the year 2002 on the five pressure levels indicated in the color code underneath Figure 2c. (4b) Change in global annual mean temperature (K) from the year 2002 on the five indicated pressure levels. (4c) Change in global annual mean thickness (m) from 2002 for the four pressure levels indicated. The thickness is defined as the difference between the global annual mean GPH on the indicated pressure level and the global annual mean GPH at 1 hPa.


November 2021 - Thermosphere Climate Index (TCI) reaches a new minimum in early 2020. Reference: M.G. Mlynczak et al. (2018), Thermosphere climate indexes: Percentile ranges and adjectival descriptors, Journal of Atmospheric and Solar-Terrestrial Physics, Volume 174, 2018, Pages 28-31, ISSN 1364-6826, https://doi.org/10.1016/j.jastp.2018.04.004.


The TCI empirically derived from 1947 through November 2021.


January 2020 - Recent work comparing SABER mean stratosphere temperatures to those measured by the COSMIC Global Positioning System Radio Occultation (GPS‐ RO), indicate that SABER temperature is stable to within 0.1-0.2 K/decade or better depending on altitude. This is roughly commensurate with less than 0.1%/decade drift in radiometric calibration for the 15µm CO2 channels. This is a remarkable achievement for a broadband radiometer. Reference: Mlynczak, Martin G., Taumi Daniels, Linda A. Hunt, Jia Yue, B. Thomas Marshall, James M. Russell, Ellis E. Remsberg, Joseph Tansock, Roy Esplin, Mark Jensen, Andrew Shumway, Larry Gordley, and J.-H. Yee (2020), Radiometric Stability of the SABER Instrument, Earth and Space Science, 7, 2, e2019EA001011, doi:10.1029/2019EA001011.


Difference between the COSMIC minus SABER global annual mean temperature in 2017 and the COSMIC minus SABER global annual mean temperature in 2007.