2019
DOI: 10.1029/2018ja026168
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Statistical Study of Selective Oxygen Increase in High‐Energy Ring Current Ions During Magnetic Storms

Abstract: Ion transport from the plasma sheet to the ring current is the main cause of the development of the ring current. Energetic (>150 keV) ring current ions are known to be transported diffusively in several days. A recent study suggested that energetic oxygen ions are transported closer to the Earth than protons due to the diffusive transport caused by a combination of the drift and drift‐bounce resonances with Pc 3–5 ultralow frequency waves during the 24 April 2013 magnetic storm. To understand the occurrence c… Show more

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Cited by 9 publications
(11 citation statements)
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“…The O + energy of ~5.37 × 10 28 keV will create the ground magnetic field perturbation of ~0.2 nT. If these O + are adiabatically convected inward by some mechanisms and reach L = 5.5 (Mitani et al, ) from L = 8.5, the O + energy increases and its contribution to the magnetic field perturbation becomes ~0.8 nT. However, we note that this estimation may be an overestimate because we are assuming the energy density is uniform in a dipole volume at L = 8–9, which may be unrealistic (Hamilton et al, ; Mitani et al, ).…”
Section: Discussionmentioning
confidence: 90%
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“…The O + energy of ~5.37 × 10 28 keV will create the ground magnetic field perturbation of ~0.2 nT. If these O + are adiabatically convected inward by some mechanisms and reach L = 5.5 (Mitani et al, ) from L = 8.5, the O + energy increases and its contribution to the magnetic field perturbation becomes ~0.8 nT. However, we note that this estimation may be an overestimate because we are assuming the energy density is uniform in a dipole volume at L = 8–9, which may be unrealistic (Hamilton et al, ; Mitani et al, ).…”
Section: Discussionmentioning
confidence: 90%
“…adiabatically convected inward by some mechanisms and reach L = 5.5 (Mitani et al, 2019) from L = 8.5, the O + energy increases and its contribution to the magnetic field perturbation becomes~0.8 nT. However, we note that this estimation may be an overestimate because we are assuming the energy density is uniform in a dipole volume at L = 8-9, which may be unrealistic (Hamilton et al, 1988;Mitani et al, 2019). Thus, the contribution of O + drift-bounce resonance to the total energy of the ring current seems very small in the 17 February 2016 event.…”
Section: Journal Of Geophysical Research: Space Physicsmentioning
confidence: 99%
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“…Quantifying the properties of outflowing ionospheric ions is one of the most important subjects for magnetospheric studies, because the physical characteristics of the magnetosphere are modulated significantly by outflowing ions. Many satellite observations have demonstrated that ionospheric O + ions are supplied to the plasma sheet and inner magnetosphere, especially during geomagnetically active periods (e.g., Daglis 1997;Yao et al 2008a;Ebihara et al 2009;Mouikis et al 2010Mouikis et al , 2019Ohtani et al 2011;Kronberg et al 2012Kronberg et al , 2015Maggiolo and Kistler 2014;Kistler and Mouikis 2016;Keika et al 2018aKeika et al , 2018bMitani et al, 2019;Kistler et al 2019). Various modeling and observational studies have suggested that an increase in the ionospheric O + ions in the magnetosphere would affect reconnection processes (e.g., Shay and Swisdak 2004;Karimabadi et al 2011;Liu et al 2015;Fuselier et al, 2019;Tenfjord et al 2019), location of the tail reconnection (Brambles et al 2010;Garcia et al 2010;Wiltberger et al 2010;Yu and Ridley 2013), growth and propagation of electromagnetic ion cyclotron waves (e.g., Omidi et al 2013;Denton et al 2014;Nosé et al, 2020), and development and decay of the ring current (e.g., Hamilton et al 1988;Keika et al 2006;Glocer et al 2009aGlocer et al ,b, 2013Welling et al 2011;Ilie et al 2015;Menz et al 2019).…”
Section: Introductionmentioning
confidence: 99%
“…Quantifying the properties of outflowing ionospheric ions is one of the most important subjects for magnetospheric studies, because the physical characteristics of the magnetosphere are modulated significantly by outflowing ions. Many satellite observations have demonstrated that ionospheric O + ions are supplied to the plasma sheet and inner magnetosphere, especially during geomagnetically active periods (e.g., Daglis 1997;Yao et al 2008a;Ebihara et al 2009;Mouikis et al 2010;Ohtani et al 2011;Kronberg et al 2012Kronberg et al , 2015Maggiolo and Kistler 2014;Kistler and Mouikis 2016;Keika et al 2018aKeika et al , 2018bMitani et al, 2019;Mouikis et al, 2019;Kistler et al 2019). Various modeling and observational studies have suggested that an increase in the ionospheric O + ions in the magnetosphere would affect reconnection processes (e.g., Shay and Swisdak 2004;Karimabadi et al 2011;Liu et al 2015;Fuselier et al, 2019;Tenfjord et al, 2019), location of the tail reconnection (Brambles et al 2010;Garcia et al 2010;Wiltberger et al 2010;Yu and Ridley 2013), growth and propagation of electromagnetic ion cyclotron waves (e.g., Omidi et al 2013;Denton et al 2014;Nosé et al, 2020), and development and decay of the ring current (e.g., Hamilton et al 1988;Keika et al 2006;Glocer et al 2009aGlocer et al , 2009bGlocer et al , 2013Welling et al 2011;Ilie et al 2015;Menz et al 2019).…”
Section: Main Text 1 Introductionmentioning
confidence: 99%