Browsing by Contributor "Yamazaki, Y."
Now showing items 1-11 of 11
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A Synoptic‐Scale Wavelike Structure in the Nighttime Equatorial Ionization Anomaly
Rodríguez‐Zuluaga, J.;
; ; ; (Earth and Space Science, 2021-02-17)
Both ground‐ and satellite‐based airglow imaging have significantly contributed to understanding the low‐latitude ionosphere, especially the morphology and dynamics of the equatorial ionization anomaly (EIA). The NASA ... -
Evolution of the Geomagnetic Daily Variation at Tatuoca, Brazil, From 1957 to 2019: A Transition From Sq to EEJ
; ; ; ; ; ; ; (Journal of Geophysical Research: Space Physics, 2020)
The magnetic equator in the Brazilian region has moved over 1,100 km northward since 1957, passing the geomagnetic observatory Tatuoca (TTB), in northern Brazil, around 2013. We recovered and processed TTB hourly mean ... -
Examining the Wind Shear Theory of Sporadic E With ICON/MIGHTI Winds and COSMIC‐2 Radio 2 Occultation Data
; ; ; ; ; ; ; ; ; (Geophysical Research Letters, 2021-12-30)
The wind shear theory is widely accepted as an explanation for the formation of a sporadic E (Es) layer, but the direct comparison of Es with the local wind shear has been limited due to the lack of neutral wind measurements. ... -
Ionospheric Signatures of Secondary Waves From Quasi‐6‐Day Wave and Tide Interactions
; (Journal of Geophysical Research: Space Physics, 2021-03-31)
A sudden stratospheric waring occurred in the southern hemisphere during September 2019, accompanied by an exceptionally strong quasi‐6‐day wave (Q6DW). We examine the ionospheric response using global total electron content ... -
Large-Amplitude Quasi-10-Day Waves in the Middle Atmosphere During Final Warmings
; (Journal of Geophysical Research: Atmospheres, 2019)
Geopotential height measurements from the Aura Microwave Limb Sounder between 9- and 97-km altitudes during 2004–2018 are used to examine long-period (3–20 days) wave activity during the Northern Hemisphere winter and ... -
Modeling of Planetary Wave Influences on the Pre‐reversal Enhancement of the Equatorial F Region Vertical Plasma Drift
; Diéval, C. (Space Weather, 2021-04-21)
Temporal and longitudinal variations of the pre‐reversal enhancement (PRE) in the equatorial F region vertical plasma drift are examined based on idealized simulations by the thermosphere‐ionosphere‐electrodynamics general ... -
Observing Earth’s magnetic environment with the GRACE-FO mission
; ; ; ; ; ; ; (Earth, Planets and Space, 2021-02-15)
The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission carries magnetometers that are dedicated to enhance the satellite’s navigation. After appropriate calibration and characterisation of artificial ... -
Quasi‐4‐Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2
; ; (Journal of Geophysical Research: Atmospheres, 2021-07-07)
This paper describes global characteristics of the westward‐propagating planetary wave with a period of ∼4 days and zonal wavenumber 2, here referred to as quasi‐4‐day wave (Q4DW), which is considered to be a manifestation ... -
September 2019 Antarctic Sudden Stratospheric Warming: Quasi-6-Day Wave Burst and Ionospheric Effects
; ; ; ; Siddiqui, T.; Kervalishvili, G.; Laštovi?ka, J.; Kozubek, M.; Ward, W.; Themens, D. R.; Kristoffersen, S.; (Geophysical Research Letters, 2020)
An exceptionally strong stationary planetary wave with Zonal Wavenumber 1 led to a sudden stratospheric warming (SSW) in the Southern Hemisphere in September 2019. Ionospheric data from European Space Agency's Swarm satellite ... -
The Geomagnetic Kp Index and Derived Indices of Geomagnetic Activity
; ; ; ; (Space Weather, 2021-05-07)
The geomagnetic Kp index is one of the most extensively used indices of geomagnetic activity, both for scientific and operational purposes. This article reviews the properties of the Kp index and provides a reference for ... -
Whole Atmosphere Model Simulations of Ultrafast Kelvin Wave Effects in the Ionosphere and Thermosphere
; ; ; ; ; (Journal of Geophysical Research: Space Physics, 2020)
The response of the upper atmosphere to equatorial Kelvin waves with a period of ∼3 days, also known as ultrafast Kelvin waves (UFKWs). The whole atmosphere model Ground-to-topside model of Atmosphere and Ionosphere for ...
