Articles | Volume 33, issue 1
https://doi.org/10.5194/angeo-33-1-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-33-1-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Regular paper
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06 Jan 2015
Regular paper | Highlight paper |
| 06 Jan 2015
Internally and externally induced deformations of the magnetospheric equatorial current as inferred from spacecraft data
N. A. Tsyganenko
CORRESPONDING AUTHOR
Institute and Faculty of Physics, Saint Petersburg State University, Saint Petersburg, Russia
V. A. Andreeva
Institute and Faculty of Physics, Saint Petersburg State University, Saint Petersburg, Russia
E. I. Gordeev
Institute and Faculty of Physics, Saint Petersburg State University, Saint Petersburg, Russia
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A. V. Nikolaev, V. A. Sergeev, N. A. Tsyganenko, M. V. Kubyshkina, H. Opgenoorth, H. Singer, and V. Angelopoulos
Ann. Geophys., 33, 505–517, https://doi.org/10.5194/angeo-33-505-2015, https://doi.org/10.5194/angeo-33-505-2015, 2015
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In this study we use two-loop model SCW (SCW2L) to quantitatively investigate distortion of the ionospheric footpoint pattern in response to changes of different SCW2L parameters. Calculation results show that SCW-related footprint shifts result in formation of auroral bulge and westward travelling surge and may contribute to rotation of auroral streamers, and that SCW2L combined with the AM03 model nicely describes the azimuthal progression and the observed magnitude of the auroral expansion.
N. A. Tsyganenko
Ann. Geophys., 31, 1745–1772, https://doi.org/10.5194/angeo-31-1745-2013, https://doi.org/10.5194/angeo-31-1745-2013, 2013
Jonas Suni, Minna Palmroth, Lucile Turc, Markus Battarbee, Giulia Cozzani, Maxime Dubart, Urs Ganse, Harriet George, Evgeny Gordeev, Konstantinos Papadakis, Yann Pfau-Kempf, Vertti Tarvus, Fasil Tesema, and Hongyang Zhou
Ann. Geophys., 41, 551–568, https://doi.org/10.5194/angeo-41-551-2023, https://doi.org/10.5194/angeo-41-551-2023, 2023
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Magnetosheath jets are structures of enhanced plasma density and/or velocity in a region of near-Earth space known as the magnetosheath. When they propagate towards the Earth, these jets can disturb the Earth's magnetic field and cause hazards for satellites. In this study, we use a simulation called Vlasiator to model near-Earth space and investigate jets using case studies and statistical analysis. We find that jets that propagate towards the Earth are different from jets that do not.
M. A. Shukhtina and E. Gordeev
Ann. Geophys., 33, 769–781, https://doi.org/10.5194/angeo-33-769-2015, https://doi.org/10.5194/angeo-33-769-2015, 2015
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We explore two new modifications of the magnetotail magnetic flux calculation algorithm based on the pressure balance approach for the tail radius determination. The new modifications extend the scope of the algorithm
to the inner magnetosphere, which is possible due to the approximate uniformity of the magnetic field of external sources.
A new empirical formula for the tail radius at the terminator is also presented.
A. V. Nikolaev, V. A. Sergeev, N. A. Tsyganenko, M. V. Kubyshkina, H. Opgenoorth, H. Singer, and V. Angelopoulos
Ann. Geophys., 33, 505–517, https://doi.org/10.5194/angeo-33-505-2015, https://doi.org/10.5194/angeo-33-505-2015, 2015
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In this study we use two-loop model SCW (SCW2L) to quantitatively investigate distortion of the ionospheric footpoint pattern in response to changes of different SCW2L parameters. Calculation results show that SCW-related footprint shifts result in formation of auroral bulge and westward travelling surge and may contribute to rotation of auroral streamers, and that SCW2L combined with the AM03 model nicely describes the azimuthal progression and the observed magnitude of the auroral expansion.
N. A. Tsyganenko
Ann. Geophys., 31, 1745–1772, https://doi.org/10.5194/angeo-31-1745-2013, https://doi.org/10.5194/angeo-31-1745-2013, 2013
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A new quantitative model of the global shape of the neutral sheet in the Earth's magnetosphere is developed, parameterized by the dipole tilt, solar wind pressure, and IMF By and Bz. The model is based on data from the Polar, Cluster, Geotail, and Themis satellites taken in 1995-2013. The paper quantifies and further explains our earlier finding of the bowl-shaped deformation of the neutral sheet due to the Earth's dipole tilt (Tsyganenko and Andreeva, GRL, v.41(4), 2014).
A new quantitative model of the global shape of the neutral sheet in the Earth's magnetosphere...
