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Links between mesopause temperatures and ground‐based VLF narrowband radio signals
Author(s) -
Silber Israel,
Price Colin,
Rodger Craig J.,
Haldoupis Christos
Publication year - 2013
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/jgrd.50379
Subject(s) - mesopause , thermosphere , mesosphere , narrowband , atmosphere (unit) , ionosphere , atmospheric sciences , amplitude , atmospheric tide , environmental science , aeronomy , irradiance , atmospheric temperature , remote sensing , geology , physics , meteorology , geophysics , optics , stratosphere
The Upper Mesosphere–Lower Thermosphere (UMLT) region of the atmosphere is known to vary on many temporal and spatial scales. However, this region of the atmosphere is very difficult to measure and monitor continuously. In this paper, we demonstrate an intriguing connection between mesopause temperatures and the intensity of very low frequencies (VLF) narrowband (NB) signals reflected off the lower ionosphere. The temperature data used are from the SABER instrument onboard the TIMED satellite, while the VLF data are obtained from various ground‐based receiving systems. The results of the analysis show a high anticorrelation between temperature and VLF amplitude. It is shown that the variability of the UMLT temperatures and VLF amplitudes can be explained by global seasonal solar irradiance changes (~72% of the variability), while the remaining variability has its origins from other sources (~28%). High‐resolution mesopause temperature estimates might be achieved in the future by combining VLF NB observations and calculated solar irradiance variability (as a function of hour, day, and location, i.e., latitude).