Model of the Position of the Main Ionospheric Trough in the Eccentric Dipole Coordinates

Capa

Citar

Texto integral

Acesso aberto Acesso aberto
Acesso é fechado Acesso está concedido
Acesso é fechado Somente assinantes

Resumo

Based on the data of probe measurements of the electron density in the ionosphere on the CHAMP satellite from July 2000 to December 2007, an analysis of the possibility of using the coordinates of the eccentric dipole (ED) in the model for the invariant latitude of the minimum of the main ionospheric trough, Φm, was carried out. It has been established that the Φm model constructed from these data in the coordinates of the corrected geomagnetic (CGM) latitude can be used without changes in the ED coordinates, since the standard deviation of the model is less than the difference in the Φm values for these two options for specifying geomagnetic latitudes. The difference in the Φm values for these two options is minimal for the Southern Hemisphere and can be noticeable for the Northern Hemisphere, especially at the longitudes of the East Siberian Magnetic Anomaly. The dependence of Φm on local time and geomagnetic activity is the main one. The dependence of Φm on geographic longitude is relatively weak, therefore the difference in the Φm values between the CGM and ED coordinates even at the longitudes of the East Siberian Magnetic Anomaly is less than the standard deviation of the model.

Texto integral

Acesso é fechado

Sobre autores

V. Shubin

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: shubin@izmiran.ru
Rússia, Troitsk

V. Badin

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences

Email: shubin@izmiran.ru
Rússia, Troitsk

M. Deminov

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences

Email: shubin@izmiran.ru
Rússia, Troitsk

R. Deminov

Kazan Federal University

Email: shubin@izmiran.ru
Rússia, Kazan

Bibliografia

  1. Акасофу С.-И., Чепмен С. Солнечно-земная физика. Ч. 1. М.: Мир, 384 с. 1974.
  2. Деминов М.Г., Шубин В.Н. Эмпирическая модель положения главного ионосферного провала // Геомагнетизм и аэрономия. Т. 58. № 3. С. 366–373. 2018. https://doi.org/10.7868/S0016794018030070
  3. Aa E., Zou S., Erickson P.J., Zhang S.-R., Liu S. Statistical analysis of the main ionospheric trough using Swarm in situ measurements // J. Geophys. Res. – Space. V. 125. № 3. ID e2019JA027583. 2020. https://doi.org/10.1029/2019JA027583
  4. Annakuliev S.K., Afonin V.V., Deminov M.G., Karpachev A.T. An empirical formula for the position of the main ionospheric trough during a magnetic storm // Geomagn. Aeronomy. V. 37. № 3. P. 392–395. 1997.
  5. Deminov M.G., Fishchuk Ya.A. On the use of the geomagnetic field approximation by the eccentric dipole in problems of ionosphere and plasmasphere modeling // Geomagn. Aeronomy. V. 40. № 3. P. 383–387. 2000.
  6. Fraser-Smith A.C. Centered and eccentric geomagnetic dipoles and their poles, 1600–1985 // Rev. Geophys. V. 25. № 1. P. 1–16. 1987. https://doi.org/10.1029/RG025i001p00001
  7. Gustafsson G., Papitashvili N.E., Papitashvili V.O. A revised corrected geomagnetic coordinate system for epochs 1985 and 1990 // J. Atmos. Terr. Phys. V. 54. № 11–12. P. 1609–1631. 1992. https://doi.org/10.1016/0021-9169(92)90167-J
  8. Karpachev A.T. Dependence of the main ionospheric trough position on local time, longitude and geomagnetic activity in the southern winter hemisphere // Adv. Space Res. V. 74. № 11. P. 6065–6073. 2024. https://doi.org/10.1016/j.asr.2024.08.075
  9. Shepherd S.G. Altitude-adjusted corrected geomagnetic coordinates: Definition and functional approximations // J. Geophys. Res.− Space. V. 119. № 9. P. 7501–7521. 2014. https://doi.org/10.1002/2014JA020264

Arquivos suplementares

Arquivos suplementares
Ação
1. JATS XML
Baixar
2. Fig. 1. Daily variations of the function Φ (t) according to equation (2) (solid line) and experimental data in CGM (dots) and ED (rhombics) coordinates. Vertical lines show the standard deviations of the experimental data in CGM coordinates.

Baixar (127KB)
Metadados
3. Fig. 2. Deviations of the latitude of the ionospheric failure minimum from the background ∆Φm due to the change of the geomagnetic activity index Kp* according to equation (7) (thick lines) and according to the experimental data in CGM (thin lines) and ED (dashed lines) coordinates.

Baixar (72KB)
Metadados
4. Fig. 3. Dependence of the function Φ (λ) on the geographic longitude λ using equations (3) and (4) (thick lines) and equation (8) in CGM and ED coordinates (thin and dashed lines, respectively).

Baixar (120KB)
Metadados

Declaração de direitos autorais © Russian Academy of Sciences, 2025