Determination of the most pertinent EUV proxy for use in thermosphere modeling

Abstract

Two major issues in the specification of the thermospheric density are the definition of proper solar inputs and the empirical modeling of thermosphere response to solar and to geomagnetic forcings. This specification is crucial for the tracking of low Earth orbiting satellites. Here we address both issues by using 14 years of daily density measurements made by the Stella satellite at 813 km altitude and by carrying out a multiscale statistical analysis of various solar inputs. First, we find that the spectrally integrated solar emission between 26-34 nm offers the best overall performance in the density reconstruction. Second, we introduce linear parametric transfer function models to describe the dynamic response of the density to the solar and geomagnetic forcings. These transfer function models lead to a major error reduction and in addition open new perspectives in the physical interpretation of the thermospheric dynamics.

References in corpus (2)

• Finding the best proxies for the solar UV irradiance
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Cited by in corpus (5)

• Synoptic solar radio observations as proxies for upper atmosphere modelling
• Sun-Heliosphere Observation-based Ionization Rates Model
• EUV Irradiance Inputs to Thermospheric Density Models: Open Issues and Path Forward
• The Slowly Varying Corona. II. The Components of F ${}_{10.7}$ and Their Use in EUV Proxies
• Extreme Ultraviolet Solar Irradiance during the rising phase of solar cycle 24 observed by PROBA2/LYRA