期刊
NONLINEAR PROCESSES IN GEOPHYSICS
卷 24, 期 4, 页码 745-750出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/npg-24-745-2017
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- National Science Academy, India
During intense magnetic storms, prompt penetration electric fields (PPEFs) through E X B forces near the magnetic equator uplift the dayside ionosphere. This effect has been called the dayside super-fountain effect. Ionneutral drag forces between the upward moving O+ (oxygen ions) and oxygen neutrals will elevate the oxygen atoms to higher altitudes. This paper gives a linear calculation indicating how serious the effect may be during an 1859-type (Carrington) superstorm. It is concluded that the oxygen neutral densities produced at low-Earth-orbiting (LEO) satellite altitudes may be sufficiently high to present severe satellite drag. It is estimated that with a prompt penetrating electric field of similar to 20mVm(-1) turned on for 20 min, the O atoms and O+ ions are uplifted to 850 km where they produce about 40-times-greater satellite drag per unit mass than normal. Stronger electric fields will presumably lead to greater uplifted mass.
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