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Found 25 entries in the Bibliography.
Showing entries from 1 through 25
2015 |
Remote sensing of Earth's limb by TIMED/GUVI: Retrieval of thermospheric composition and temperature The Global Ultraviolet Imager (GUVI) onboard the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite senses far ultraviolet emissions from O and N2 in the thermosphere. Transformation of far ultraviolet radiances measured on the Earth limb into O, N2, and O2 number densities and temperature quantifies these responses and demonstrates the value of simultaneous altitude and geographic information. Composition and temperature variations are available from 2002 to 2007 ... Meier, R.; Picone, J.; Drob, D.; Bishop, J.; Emmert, J.; Lean, J.; Stephan, A.; Strickland, D.; Christensen, A.; Paxton, L.; Morrison, D.; Kil, H.; Wolven, B.; Woods, Thomas; Crowley, G.; Gibson, S.; Published by: Earth and Space Science Published on: 01/2015 YEAR: 2015   DOI: 10.1002/2014EA000035 airglow and aurora; remote sensing; thermosphere: composition and chemistry; thermosphere: energy deposition |
2014 |
Attribution of interminima changes in the global thermosphere and ionosphere We present a statistical attribution analysis of the changes in global annual average thermospheric mass density and ionospheric total electron content (TEC) between the cycle 22/23 solar minimum (which occurred at epoch 1996.4) and the prolonged cycle 23/24 minimum (2008.8). The mass density data are derived from orbital drag, and the TEC data are derived from ground-based GPS receivers. The interminima change in mass density was -36\% relative to the 1996.4 yearly average. Considering each multiplicative forcing indepen ... Emmert, J.; McDonald, S.; Drob, D.; Meier, R.; Lean, J.; Picone, J.; Published by: Journal of Geophysical Research: Space Physics Published on: 08/2014 YEAR: 2014   DOI: 10.1002/2013JA019484 ionosphere total electron content; solar minimum; thermosphere mass density |
2013 |
Theoretical tools for studies of low-frequency thermospheric variability [1]\ This paper supports studies of low-frequency variability (LFV) within the thermosphere by deriving approximate integral and closed-form solutions of a nontrivial model of thermospheric temperature, density, and composition depending on altitude and time. We also provide a paradigm for applying dimensional analysis in such studies. The domain is the region between the mesopause and the exobase. The solutions emphasize the connectedness of the thermosphere, i.e., nonlocal influences of LFV in key physical paramete ... Picone, J.; Meier, R.; Emmert, J.; Published by: Journal of Geophysical Research: Space Physics Published on: 09/2013 YEAR: 2013   DOI: 10.1002/jgra.v118.910.1002/jgra.50472 dimensional analysis; low frequency variation; Pi Theorem; seasonal variation; semi-annual variation; thermospheric variability |
2012 |
SAMI3 Simulations of Ionospheric Variability from 1996 to 2011
McDonald, SE; Lean, J; Huba, JD; Emmert, JT; Drob, DP; Siefring, CL; Meier, RR; Picone, J; Published by: Published on: |
2011 |
Global and regional trends in ionospheric total electron content
Lean, J.; Emmert, J.; Picone, J.; Meier, R.; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2010JA016378 |
Ionospheric total electron content: Global and hemispheric climatology
Lean, J.; Meier, R.; Picone, J.; Emmert, J.; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2011JA016567 |
Simulating Ionospheric Variability in the Descending Phase of Solar Cycle-23 using SAMI3
McDonald, SE; Lean, J; Huba, JD; Joyce, GR; Emmert, JT; Drob, DP; Stephan, AW; Siefring, CL; Meier, RR; Picone, J; Published by: Published on: |
2010 |
Record-low thermospheric density during the 2008 solar minimum
Emmert, J.; Lean, J.; Picone, J.; Published by: Geophysical Research Letters Published on: Jan-06-2010 YEAR: 2010   DOI: 10.1029/2010GL043671 |
Integrating the Sun-Earth System for the Operational Environment (ISES-OE)
Lean, J.; Huba, J.; McDonald, S.; Slinker, S.; Drob, D.; Emmert, J.; Meier, R.; Picone, J.; Joyce, G.; Krall, J.; Stephan, A.; Roach, K.; Knight, H.; Plunkett, S.; Wu, C.-C.; Wood, B.; Wang, Y.-M.; Howard, R.; Chen, J.; Bernhardt, P.; Fedder, J.; Published by: Published on: |
2008 |
We use orbit data on ∼5000 near-Earth space objects to investigate long-term trends in thermospheric total mass density, which has been predicted to decrease with time due to increasing CO2 concentrations. We refine and extend to 2007 previous density trend estimates, and investigate solar cycle-dependent bias in empirical density models previously used to filter out solar irradiance effects. We find that the bias is caused in part by the solar cycle dependence of the long-term trends, and we develop a new representation ... Emmert, JT; Picone, IM; Meier, RR; Published by: Geophysical Research Letters Published on: YEAR: 2008   DOI: 10.1029/2007GL032809 |
This paper investigates the effect of simple systematic error, or bias (i.e., in the magnitude of data or an associated model), on physical parameters retrieved by least squares algorithms from observations that are indexed by an independent variable. This factor is now of critical interest with the advent of global, space-based ultraviolet remote sensing of thermospheric and ionospheric composition by experimental and operational systems. A finite bias between an observed intensity profile and the parametric physical model ... Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2008   DOI: https://doi.org/10.1029/2007JA012831 |
Long-term climatology and trends of global average thermospheric density
Emmert, John; Picone, Michael; Meier, Robert; Published by: 37th COSPAR Scientific Assembly Published on: |
2006 |
Thermospheric densities derived from spacecraft orbits: Application to the Starshine satellites
Lean, J.; Picone, J.; Emmert, J.; Moore, G.; Published by: Journal of Geophysical Research Published on: Jan-01-2006 YEAR: 2006   DOI: 10.1029/2005JA011399 |
Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB; Published by: Journal of Geophysical Research Published on: YEAR: 2006   DOI: 10.1029/2005JA011495 |
Thermospheric density 2002–2004: TIMED/GUVI dayside limb observations and satellite drag We use TIMED/GUVI dayside limb observations of thermospheric far ultraviolet (FUV) dayglow to infer height profiles of total mass density during the period 2002–2004. We compare these data with total mass density derived from drag-induced changes in the orbits of satellites with perigee heights ranging from 200 to 600 km. To accommodate sampling differences, we compute the ratio of observed total mass density, filtered on a 3-day timescale, to that predicted by the NRLMSISE-00 empirical model. The GUVI densities are in goo ... Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2006   DOI: https://doi.org/10.1029/2005JA011495 |
Thermospheric density 2002—2004: TIMED/GUVI dayside limb observations and satellite drag
Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB; Published by: Journal of Geophysical Research: Space Physics Published on: |
2005 |
Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Published by: Published on: |
Orbital Drag-Atmospheric Density Concept of Operations2004 Update The Global UV Imager (GUVI), a predecessor instrument to SSUSI, has shown promising, though limited, comparison to orbit-based densities. Current operations at the SCC rely on Buell, Diane; Walterscheid, Richard; Marcos, Frank; Fuller-Rowell, Tim; Picone, J; Storz, Mark; Owens, Jerry; Published by: Published on: |
SSUSI and GUVI limb scans of thermospheric neutral density changes during a geomagnetic storm
Stephan, AW; Picone, JM; Meier, RR; Emmert, JT; Paxton, LJ; Morrison, D; Wolven, B; Kil, H; Published by: Published on: |
2004 |
Similarity transformation method for data processing and visualization
Picone, Michael; Meier, Robert; Published by: Published on: 3 |
2003 |
Retrieval of thermospheric temperature and N2, O, and O2 concentrations from GUVI limb scans
Meier, RR; Strickland, DJ; Picone, JM; Christensen, AB; Paxton, LJ; Morrison, D; Kil, H; Bishop, J; Drob, D; Craven, JD; , others; Published by: Published on: |
2002 |
Molecular Oxygen in the Thermosphere: Issues and Measurement Strategies
Picone, JM; Hedin, AE; Drob, DP; Meier, RR; Bishop, J; Budzien, SA; Published by: Published on: |
Ionospheric and dayglow responses to the radiative phase of the Bastille Day flare
Meier, RR; Warren, HP; Nicholas, AC; Bishop, J; Huba, JD; Drob, DP; Lean, JL; Picone, JM; Mariska, JT; Joyce, G; , others; Published by: Geophysical research letters Published on: |
Parameterizations of solar EUV irradiance variations for use in upper atmosphere density models
Lean, JL; Picone, JM; Mariska, JT; Warren, HP; Knowles, S; Bishop, J; Meier, RR; Published by: Advances in the Astronautical Sciences Published on: |
1994 |
Published by: Journal of Geophysical Research: Space Physics Published on: |
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