Weak magnetic storms can modulate ionosphere-plasmasphere interaction significantly: mechanisms and manifestations at mid-latitudes
Autor: | I. F. Domnin, Dmytro Kotov, Vladimir Truhlik, János Lichtenberger, Mariangel Fedrizzi, Maryna Shulha, Oleksandr Bogomaz, Ya. M. Chepurnyy, P. G. Richards, L. F. Chernogor, T. G. Zhivolup, Naomi Maruyama, Manuel Hernández-Pajares, L. Ya. Emelyanov |
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Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Matemàtiques, Universitat Politècnica de Catalunya. IonSAT - Grup de determinació Ionosfèrica i navegació per SAtèl·lit i sistemes Terrestres |
Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
Astrofísica
ionosphere-plasmasphere interaction 85 Astronomy and astrophysics [Classificació AMS] Matemàtiques i estadística::Matemàtica aplicada a les ciències [Àrees temàtiques de la UPC] Plasmasphere Storm thermosphere hydrogen density Geofísica Atmospheric sciences Physics::Geophysics Geophysics Space and Planetary Science modulation of H+ ion flux topside ion composition Middle latitudes Astronomy and astrophysics Physics::Space Physics 86 Geophysics [Classificació AMS] Ionosphere Weak magnetic storms mid-latitude ionosphere Geology |
Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
Popis: | A comprehensive study of the response of the ionosphere-plasmasphere system at mid-latitudes to weak (Dstmin > -50 nT) magnetic storms is presented. For the first time, it is shown that weak magnetic disturbances can lead to significant modulation of ionosphere-plasmasphere H+ ion fluxes. It is found that this modulation is caused by the enhancements/reductions of the topside O+ ion density, which is induced by F2-layer peak height rise and fall during the storms. The F2-layer motion is caused by thermospheric wind changes and by a penetration electric field. Both drivers are closely related to the changes in the Bz component of interplanetary magnetic field. The most prominent manifestation of the H+ ion flux modulation is strong changes in H+ ion fraction in the topside ionosphere. This study also indicates that the NRLMSISE-00 model provides the correct relative changes of neutral H density during weak magnetic storms and also that there is a compelling need to include geomagnetic activity indices, in addition to solar activity (F10.7), as input parameters to empirical topside ionosphere models. |
Databáze: | OpenAIRE |
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