Closure of F Region Dynamo Currents: Revisiting CHAMP Magnetic Field Data
نویسندگان
چکیده
منابع مشابه
Direct observation of the F region dynamo currents and the spatial structure of the EEJ by CHAMP
[1] The satellite CHAMP in its low-altitude polar orbit, and with its high-resolution magnetic field measurements, provides the opportunity to investigate ionospheric currents in great detail. In this study we focus on average features of equatorial current systems during day time. Considering quiet time observations from the period Aug. 2000 to Oct. 2004 we determined the mean spatial structur...
متن کاملIonospheric currents and field-aligned currents generated by dynamo action in an asymmetric Earth magnetic field
[1] To investigate the influence of the magnetic field configuration on large-scale ionospheric electrodynamics, a geomagnetic field coordinate system based on Euler potentials is built for three magnetic field configurations: dipole, tilted dipole, and a revision of the International Geomagnetic Reference Field (IGRF). The two-dimensional ionospheric dynamo equation is expressed in this framew...
متن کاملFirst in-situ observation of night-time F region currents with the CHAMP satellite
[1] The CHAMP satellite in its polar, low-Earth orbit (450 km altitude) is a suitable platform for studying F region currents. High precision magnetic field measurements are used to detect and characterize these upper ionospheric currents on the Earth’s nightside. A few examples are presented to illustrate the special features of the currents and a statistical study is performed on half a year ...
متن کاملA Vorticity-magnetic Field Dynamo Instability
We generalize the mean field magnetic dynamo to include local evolution of the mean vorticity in addition to the mean magnetic field. The coupled equations exhibit a general mean field dynamo instability that enables the transfer of turbulent energy to the magnetic field and vorticity on larger scales. The growth of the vorticity and magnetic field both require helical turbulence which can be s...
متن کاملDynamo Theory and Earth’s Magnetic Field
The Earth’s magnetic field belongs in that class of physical phenomena which are commonplace yet also very complex. It is commonplace in that almost everyone knows that it exists, yet not very many people (probably including a good percentage of physicists) know how it works. The theory behind the generation of a magnetic field, known as dynamo theory, is still an active area of research. The e...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2020
ISSN: 2169-9380,2169-9402
DOI: 10.1029/2020ja028522