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Calculation of bounce‐averaged velocities and hydrogen densities for a storm‐time magnetic field
Author(s) -
Vapirev Alexander E.,
Jordanova Vania K.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl029380
Subject(s) - ring current , magnetosphere , dipole , physics , geomagnetic storm , earth's magnetic field , magnetic dipole , magnetic field , magnetopause , geophysics , field (mathematics) , computational physics , ion , curvature , dipole model of the earth's magnetic field , atomic physics , solar wind , interplanetary magnetic field , geometry , quantum mechanics , mathematics , pure mathematics
Ion drift calculations in the inner magnetosphere are important for the study of the ring current. We calculate the bounce‐averaged hydrogen densities and magnetic gradient‐curvature drift velocities for ions moving in the storm‐time T04s magnetic field, and compare them with those for a dipole field for various geomagnetic conditions. We find that the hydrogen density for T04s differs with ∼5% from that for a dipole field for quiet time and it may become 30% smaller for disturbed conditions on the nightside for L > 4. The velocities for T04s at large L‐shells are ∼20% higher on the nightside and 20% lower on the dayside than those for a dipole field for quiet time. For disturbed conditions they are respectively ∼200% higher and 20% lower than the dipole values. The contribution of the cross‐B term to the magnetic drift is ∼5%.