Abstract
A study is performed of morning polar bay-like magnetic disturbances observed at latitudes above 70° MLAT with no simultaneous geomagnetic activity at lower latitudes. It is shown that such disturbances can be caused by the spatial expansion of both nighttime substorms and daytime polar magnetic bays to the morning side, along with the generation of convective magnetic bays. The simultaneous development of nighttime substorms and convective polar bays is typical. It is shown that individual events of morning polar magnetic bays observed during the development of nighttime substorms can be accompanied by mid-latitude positive morning magnetic bays.
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ACKNOWLEDGMENTS
We thank the creators of the IMAGE (http:// space.fmi.fi/image/) and AMPERE (http://ampere.jhuapl.edu.) data bases allowing us to use them in this work.
Funding
The work of I.V. Despirak, N.G. Kleimenova, L.I. Gromova, and A.A. Lyubchich were supported by the Russian Foundation for Basic Research and the Bulgarian National Science Fund, project no. 20-55-18003. The work of S.V. Gromov was performed as part of a State Task for the Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation. The work of L.M. Malysheva was performed as part of a State Task for the Institute of Physics of the Earth.
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Translated by A. Nikol’skii
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Kleimenova, N.G., Despirak, I.V., Lyubchich, A.A. et al. Morning Geomagnetic Bays at Polar Latitudes and Their Magnetospheric Sources. Bull. Russ. Acad. Sci. Phys. 86, 1511–1518 (2022). https://doi.org/10.3103/S1062873822120152
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DOI: https://doi.org/10.3103/S1062873822120152