Evolution of Open Magnetic Flux During Substorms: The Effects of Dipole Tilt Angle
Geophysical Research LettersThere is a long‐standing debate on the causes of the semiannual variation of geomagnetic activity. One of the prevailing hypotheses is that the Earth's dipole tilt angle Ψ modulates the dayside reconnection rate, causing the so‐called equinoctial effect.
A. Nair +3 more
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Relationship Between Geomagnetic Storms and Auroral/Magnetospheric Substorms: Early Studies
Frontiers in Astronomy and Space Sciences, 2020 This paper describes a short story of how I learned in early days in space physics (1960–1970) that there are the direct and feed-back relationships between geomagnetic storms and auroral/magnetospheric substorms.
Syun-Ichi Akasofu
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Journal of Geophysical Research: Space Physics, 2009 The specific entropy (s = p/ργ) and total entropy (S = p1/γV) of the plasma sheet during substorms are investigated with DMSP observations using a method that assumes ion isotropy (as also assumed in the derivation of S = p1/γV) and empirical magnetic field models that capture the expected characteristics of substorm phases.
Simon Wing, Jay R. Johnson
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Statistical properties of substorms during different storm and solar cycle phases [PDF]
Annales Geophysicae, 2013 Substorm properties during different storm phases have been studied using an automated recognition of substorm and storm phases in the auroral electrojet (AL) and ring current (Dst) index data from 1995–2009.
N. Partamies +4 more
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Superposed epoch analysis of the ionospheric convection evolution during substorms: onset latitude dependence [PDF]
Annales Geophysicae, 2009 Using data from the Super Dual Auroral Radar Network (SuperDARN) we investigate the ionospheric convection response to magnetospheric substorms. Substorms were identified using the Far Ultraviolet (FUV) instrument on board the Imager for Magnetopause ...
A. Grocott +3 more
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The effect of magnetic substorms on near-ground atmospheric current [PDF]
Annales Geophysicae, 2000 Ionosphere-magnetosphere disturbances at high latitudes, e.g. magnetic substorms, are accompanied by energetic particle precipitation and strong variations of the ionospheric electric fields and currents.
E. Belova, S. Kirkwood, H. Tammet
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Organization of the magnetosphere during substorms [PDF]
, 2011 The change in degree of organization of the magnetosphere during substorms is investigated by analyzing various geomagnetic indices, as well as interplanetary magnetic field z-component and solar wind flow speed.
Abarbanel +44 more
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A superposed epoch analysis of auroral evolution during substorm growth, onset and recovery: open magnetic flux control of substorm intensity [PDF]
Annales Geophysicae, 2009 We perform two superposed epoch analyses of the auroral evolution during substorms using the FUV instrument on the Imager for Magnetopause-to-Aurora Global Explorer (IMAGE) spacecraft. The larger of the two studies includes nearly 2000 substorms.
S. E. Milan +8 more
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Polar Mesospheric Summer Echo Characteristics in Magnetic Local Time and Height Profiles
Journal of Astronomy and Space Sciences, 2023 We conducted a statistical study of polar mesospheric summer echoes (PMSEs) in relation to magnetic local time (MLT), considering the geomagnetic conditions using the K-index (or K).
Young-Sook Lee +4 more
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Are Dawn Storms Jupiter's Auroral Substorms?
AGU Advances, 2021 Dawn storms are among the brightest events in the Jovian aurorae. Up to now, they had only been observed from Earth‐based observatories, only showing the Sun‐facing side of the planet. Here, we show for the first time global views of the phenomenon, from
B. Bonfond +18 more
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