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Forbes JM, Zhang X, Heelis R, Stoneback R, Englert CR, Harlander JM, Harding BJ, Marr KD, Makela JJ, Immel TJ. Atmosphere-Ionosphere (A-I) Coupling as Viewed by ICON: Day-to-Day Variability Due to Planetary Wave (PW)-Tide Interactions. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2021; 126:e2020JA028927. [PMID: 34650898 PMCID: PMC8507145 DOI: 10.1029/2020ja028927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 05/24/2021] [Indexed: 06/13/2023]
Abstract
Coincident Ionospheric Connections Explorer (ICON) measurements of neutral winds, plasma drifts and total ion densities (:=Ne, electron density) are analyzed during January 1-21, 2020 to reveal the relationship between neutral winds and ionospheric variability on a day-to-day basis. Atmosphere-ionosphere (A-I) connectivity inevitably involves a spectrum of planetary waves (PWs), tides and secondary waves due to wave-wave nonlinear interactions. To provide a definitive attribution of dynamical origins, the current study focuses on a time interval when the longitudinal wave-4 component of the E-region winds is dominated by the eastward-propagating diurnal tide with zonal wavenumber s = -3 (DE3). DE3 is identified in winds and ionospheric parameters through its characteristic dependence on local solar time and longitude as ICON's orbit precesses. Superimposed on this trend are large variations in low-latitude DE3 wave-4 zonal winds (±40 ms-1) and topside F-region equatorial vertical drifts at periods consistent with 2-days and 6-days PWs, and a ~3-day ultra-fast Kelvin wave (UFKW), coexisting during this time interval; the DE3 winds, dynamo electric fields, and drifts are modulated by these waves. Wave-4 variability in Ne is of order 25%-35%, but the origins are more complex, likely additionally reflecting transport by ~20-25 ms-1 wave-4 in-situ winds containing strong signatures of DE3 interactions with ambient diurnal Sun-synchronous winds and ion drag. These results are the first to show a direct link between day-to-day wave-4 variability in contemporaneously measured E-region neutral winds and F-region ionospheric drifts and electron densities.
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Affiliation(s)
- Jeffrey M Forbes
- Ann and H.J. Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - Xiaoli Zhang
- Ann and H.J. Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - Roderick Heelis
- William B. Hanson Center for Space Sciences, University of Texas at Dallas, Richardson, TX, USA
| | - Russell Stoneback
- William B. Hanson Center for Space Sciences, University of Texas at Dallas, Richardson, TX, USA
| | | | | | - Brian J Harding
- Space Sciences Laboratory, University of California Berkeley, Berkeley, CA, USA
| | - Kenneth D Marr
- Space Science Division, U.S. Naval Research Laboratory, Washington, DC, USA
| | - Jonathan J Makela
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Thomas J Immel
- Space Sciences Laboratory, University of California Berkeley, Berkeley, CA, USA
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Maute A. Thermosphere-Ionosphere-Electrodynamics General Circulation Model for the Ionospheric Connection Explorer: TIEGCM-ICON. SPACE SCIENCE REVIEWS 2017; 212:523-551. [PMID: 30026634 PMCID: PMC6047070 DOI: 10.1007/s11214-017-0330-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 01/04/2017] [Indexed: 05/24/2023]
Abstract
The NASA Ionospheric Connection explorer (ICON) will study the coupling between the thermosphere and ionosphere at low- and mid-latitudes by measuring the key parameters. The ICON mission will also employ numerical modeling to support the interpretation of the observations, and examine the importance of different vertical coupling mechanisms by conducting numerical experiments. One of these models is the Thermosphere-Ionosphere-Electrodynamics General Circulation Model-ICON (TIEGCM-ICON) which will be driven by tidal perturbations derived from ICON observations using the Hough Mode Extension method (HME) and at high latitude by ion convection and auroral particle precipitation patterns from the Assimilative Mapping of Ionospheric Electrodynamics (AMIE). The TIEGCM-ICON will simulate the thermosphere-ionosphere (TI) system during the period of the ICON mission. In this report the TIEGCM-ICON is introduced, and the focus is on examining the effect of the lower boundary on the TI-system to provide some guidance for interpreting future ICON model results.
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Miyoshi Y, Fujiwara H, Jin H, Shinagawa H, Liu H, Terada K. Model study on the formation of the equatorial mass density anomaly in the thermosphere. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010ja016315] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Y. Miyoshi
- Department of Earth and Planetary Sciences; Kyushu University; Fukuoka Japan
| | - H. Fujiwara
- Department of Geophysics; Tohoku University; Sendai Japan
| | - H. Jin
- National Institute of Information and Communication Technology; Koganei Japan
| | - H. Shinagawa
- National Institute of Information and Communication Technology; Koganei Japan
| | - H. Liu
- Research Institute for Sustainable Humanosphere; Kyoto University; Kyoto Japan
| | - K. Terada
- Department of Geophysics; Tohoku University; Sendai Japan
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