A5102973606- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Planetary Science and Exploration
- GNSS positioning and interference
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Impact of Light on Environment and Health
- Spacecraft and Cryogenic Technologies
- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Astronomical Observations and Instrumentation
- Aeolian processes and effects
- Cold Atom Physics and Bose-Einstein Condensates
- Climate variability and models
- Material Science and Thermodynamics
- Inertial Sensor and Navigation
- Global Energy and Sustainability Research
- Solar Radiation and Photovoltaics
- Quantum many-body systems
- Space Science and Extraterrestrial Life
United States Naval Research Laboratory
1993-2022
Abstract NRLMSIS® 2.0 is an empirical atmospheric model that extends from the ground to exobase and describes average observed behavior of temperature, eight species densities, mass density via a parametric analytic formulation. The inputs are location, day year, time day, solar activity, geomagnetic activity. NRLMSIS major, reformulated upgrade previous version, NRLMSISE‐00. now couples thermospheric densities entire column, effective profile transitions each fully mixed region below ~70 km...
We use orbit data on ∼5000 near‐Earth space objects to investigate long‐term trends in thermospheric total mass density, which has been predicted decrease with time due increasing CO 2 concentrations. refine and extend 2007 previous density trend estimates, solar cycle‐dependent bias empirical models previously used filter out irradiance effects. find that the is caused part by cycle dependence of trends, we develop a new representation cycle, seasonal, geomagnetic activity At 400 km,...
Abstract We have developed an empirical model of nitric oxide (NO) number density at altitudes from ∼73 km to the exobase, as a function altitude, latitude, day year, solar zenith angle, activity, and geomagnetic activity. The is part NRLMSIS® 2.1 atmospheric temperature species densities; this upgrade NRLMSIS 2.0 consists solely addition NO. MSIS assimilates observations six space‐based instruments: UARS/HALOE, SNOE, Envisat/MIPAS, ACE/FTS, Odin/SMR, AIM/SOFIE. additionally evaluated new...
Chromospheric emission lines are the dominant energy input to Earth's upper atmosphere, where they create its embedded ionosphere. Knowledge of Sun's chromospheric radiation is therefore essential for understanding variability in this region, which contributes significantly space weather. With goal obtaining a suitable surrogate extreme ultraviolet irradiance atmospheric studies, we construct composite index by comparing and cross calibrating available ground‐ space‐based indices. Since...
The far ultraviolet (FUV) analysis technique of Strickland et al. [this issue] is used to infer height‐integrated O/N 2 column densities from O I‐130.4‐nm FUV dayglow images taken by the Dynamics Explorer 1 (DE 1) spin scan auroral imager (SAI) [ Frank , 1981] during a large solar proton event that occurred on July 13, 1982. results show decreases in northern hemisphere as result seasonal and storm time effects. Furthermore, these differ significantly corresponding predictions made MSISE‐90...
Millstone Hill ionospheric incoherent scatter radar data collected during June 5–11, 1991, are analyzed to determine F region neutral and ion composition, density, temperature. The 10.7‐cm solar flux index was at the very high level of 250, magnetic activity Kp ranged up highest possible 9 this period, making it particular interest for understanding upper atmosphere behavior such a nearly limiting combination conditions experienced by thermosphere. We find that Mass Spectrometer Incoherent...
The Remote Atmospheric and Ionospheric Detection System experiment consists of eight instruments spanning the wavelength range from extreme ultraviolet (55 nm) to near infrared (800 oriented view Earth's limb National Oceanic Administration TIROS-J spacecraft be launched into a circular orbit in 1993. Through measurements natural optical emissions scattered sunlight originating upper atmosphere including mesosphere thermosphere, state variables such as temperature, composition, density, ion...
A variational derivation of Heisenberg or valence-bond models from a Hubbard (or Pariser-Parr-Pople) Hamiltonian is described. Calculations within low-order approximation are carried out for linear-chain and graphite lattices. The results seem to be quite accurate with little computational effort when compared other approaches.
The similarity transform method provides a new, highly robust, and stable parametric representation of geophysical functions for use in retrieving such from remote sensing observations. present discussion focuses on the approximation altitude profiles upper atmospheric species concentration development forward models with discrete inverse theory (DIT). Of equal importance, approach framework extracting generic profile shape information, form nondimensional function, observations or detailed...