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NAIRAS Ionizing Radiation Model: Extension from Atmosphere to SpaceThe Nowcast of Aerospace Ionizing RAdiation System (NAIRAS) model is a real-time, global, physics-based model originally developed to predict exposure from cosmic radiation to air travelers from both galactic and solar sources. A prototype operational NAIRAS model has provided tabular and graphical data products via its public web site for about ten years. A new version of the NAIRAS model has been developed that incorporates an extension of the model domain from the atmospheric ionizing radiation environment to the space radiation environment, with the addition of the trapped inner belt proton source and altitude-dependent and rigidity-dependent geomagnetic shielding of the galactic cosmic rays (GCR) and solar energetic particle (SEP) protons. New output products of differential and integral particle flux have been developed for the characterization of single-event effects (SEE), expanding the application of NAIRAS from human radiation exposure assessment to allowing end-users to quantify radiation environment risks to aviation and spacecraft microelectronic systems. The NAIRAS model has transitioned to prototype operations at the Community Coordinated Modeling Center (CCMC) where the model now operates in two modes: (1) real-time global predictions of the atmospheric radiation environment and (2) a run-on-request (RoR) service allowing the user to select a specific time period for the global dosimetric calculations, or to upload an aircraft, balloon, or spaceflight trajectory file to provide predictions of the dosimetric and particle flux quantities along the flight path. The new features of NAIRAS version 3.0 are described in this paper and example results of the new output products for low-Earth orbit (LEO), medium-Earth orbit (MEO), and free-space radiation environments are presented
Document ID
Acquisition Source
Langley Research Center
Document Type
Technical Publication (TP)
Christopher J. Mertens
(Langley Research Center Hampton, Virginia, United States)
Guillaume P. Gronoff
(Science Systems and Applications (United States) Lanham, Maryland, United States)
Daniel Phoenix
(Science Systems and Applications (United States) Lanham, Maryland, United States)
Yihua Zheng
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Maksym Petrenko
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Janessa Buhler
(Kennedy Space Center Merritt Island, Florida, United States)
Insoo Jun
(Jet Propulsion Lab La Cañada Flintridge, California, United States)
Joseph Minow
(Langley Research Center Hampton, Virginia, United States)
Emily Willis
(Marshall Space Flight Center Redstone Arsenal, Alabama, United States)
Date Acquired
April 24, 2023
Publication Date
May 1, 2023
Subject Category
Space Radiation
Computer Programming and Software
Funding Number(s)
WBS: 869021.
Distribution Limits
Public Use Permitted.
Technical Review
NASA Peer Committee
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