Modeling the Electron and Ion Temperatures under Anthropogenic Influences on the Ionosphere

Medvedev, V. V.; Ishanov, S. A.; Zenkin, V. I.

doi:10.1023/b:cosm.0000033304.02869.9e

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“…At present, dynamics of the ionosphere and its inhomogeneous structure, as well as ionospheric coupling with the troposphere and thermosphere, is one of the most active topics in geophysics. The Earth's upper atmosphere is strongly influenced by a large number of irregular and quasi‐regular factors, such as sporadic Sun activity [ Hargreaves , ], strong neutral atmosphere effects [ Zalizovsky and Yampolsky , ; Yampolski et al , ], solar terminator [ Somsikov , ], man‐made processes [ Medvedev et al , ], and auroral activity [ Ignat'ev , ; MacDougall and Jayachandran , ]. A complex interplay of all these inputs produces ionospheric irregularities with a broad range of spatial scales (from tens of centimeters to thousands of kilometers) and velocities (from a fraction of m/s to km/s) [ Gershman et al , ].…”

Section: Introductionmentioning

confidence: 99%

Statistics of ionospheric disturbances over the Antarctic Peninsula as derived from TEC measurements

et al. 2016

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Results of ionospheric disturbances observations using multisite total electron content (TEC) measurements over the Antarctic Peninsula for the period from 2009 to 2012 are presented. Diurnal dependencies of the disturbance occurrence frequency, velocity, and direction of motion are established. Parameters of the disturbances are calculated using dynamic approach to the problem of ionospheric disturbances diagnostics which has been extended to allow for an arbitrary waveform of TEC perturbations. Specific data quality constraints are introduced to determine the presence of wavelike disturbances in the TEC records and to satisfy the required accuracy of parameter reconstruction. Statistical treatment of the results shows that during the daytime disturbances propagate predominantly in the northern and northeastern directions. In the evening and nocturnal hours the northwestern direction is prevailing, with the characteristic disturbance velocities ranging from 10 to 250 m/s. The most probable velocities are tens of meters per second, while the mean values are equal to about 100–130 m/s. In the daytime the velocities of the ionospheric disturbances are even higher. During the Antarctic winter time disturbances are usually observed at local noon time, in sharp contrast with the summer time, when they are present during the nights and mornings.

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Section: Introductionmentioning

confidence: 99%