NDLI: A combined solar and geomagnetic index for thermospheric climate

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A combined solar and geomagnetic index for thermospheric climate

Content Provider	NASA Technical Reports Server (NTRS)
Author	Mlynczak, Marty Hunt, Linda
Copyright Year	2015
Description	Infrared radiation from nitric oxide (NO) at 5.3 Ã is a primary mechanism by which the thermosphere cools to space. The SABER instrument on the NASA TIMED satellite has been measuring thermospheric cooling by NO for over 13 years. Physically, changes in NO emission are due to changes in temperature, atomic oxygen, and the NO density. These physical changes however are driven by changes in solar irradiance and changes in geomagnetic conditions. We show that the SABER time series of globally integrated infrared power (Watts) radiated by NO can be replicated accurately by a multiple linear regression fit using the F10.7, Ap, and Dst indices. This fit enables several fundamental properties of NO cooling to be determined as well as their variability with time, permitting reconstruction of the NO power time series back nearly 70 years with extant databases of these indices. The relative roles of solar ultraviolet and geomagnetic processes in determining the NO cooling are derived and shown to be solar cycle dependent. This reconstruction provides a long-term time series of an integral radiative constraint on thermospheric climate that can be used to test climate models.
File Size	9383113
Page Count	13
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20160007086
Archival Resource Key	ark:/13960/t8z947r21
Language	English
Publisher Date	2015-04-26
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Gas Density Geomagnetism Thermosphere Oxygen Atoms Time Series Analysis Infrared Radiation Climate Models Solar Radiation Solar Cycles Data Bases Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Presentation

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