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  • Yamazaki_et_al-2017-Journal_of_Geophysical_Research-_Space_Physics

    Rights statement: ©2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Average field-aligned ion velocity over the EISCAT radars

Research output: Contribution to journalJournal article

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Average field-aligned ion velocity over the EISCAT radars. / Yamazaki, Yosuke; Kosch, Michael Jurgen; Ogawa, Yasunobu.

In: Journal of Geophysical Research: Space Physics, Vol. 122, No. 5, 31.05.2019, p. 5630-5642.

Research output: Contribution to journalJournal article

Harvard

Yamazaki, Y, Kosch, MJ & Ogawa, Y 2019, 'Average field-aligned ion velocity over the EISCAT radars', Journal of Geophysical Research: Space Physics, vol. 122, no. 5, pp. 5630-5642. https://doi.org/10.1002/2017JA023974

APA

Yamazaki, Y., Kosch, M. J., & Ogawa, Y. (2019). Average field-aligned ion velocity over the EISCAT radars. Journal of Geophysical Research: Space Physics, 122(5), 5630-5642. https://doi.org/10.1002/2017JA023974

Vancouver

Yamazaki Y, Kosch MJ, Ogawa Y. Average field-aligned ion velocity over the EISCAT radars. Journal of Geophysical Research: Space Physics. 2019 May 31;122(5):5630-5642. https://doi.org/10.1002/2017JA023974

Author

Yamazaki, Yosuke ; Kosch, Michael Jurgen ; Ogawa, Yasunobu. / Average field-aligned ion velocity over the EISCAT radars. In: Journal of Geophysical Research: Space Physics. 2019 ; Vol. 122, No. 5. pp. 5630-5642.

Bibtex

@article{bc977339e3aa45919f5fac5b419577cf,
title = "Average field-aligned ion velocity over the EISCAT radars",
abstract = "Long-term measurements by the European Incoherent Scatter (EISCAT) radars at Troms{\o} (69.6° N, 19.2° E) and Svalbard (78.2° N, 16.0° E) are used to determine the climatology of the field-aligned ion velocity in the F-region ionosphere (175–475 km) at high latitudes. The average ion velocity is calculated at various altitudes and times of day. The magnitude of the average field-aligned ion velocity is on the order of 10 m/s, similar to previous results at middle and low latitudes. The results obtained for the two radars are in good agreement. During daytime the direction of the average field-aligned ion velocity changes from downward to upward around 350 km, while during nighttime it is upward at all heights. The reversal height of the daytime field-aligned ion velocity depends on solar activity. It is elevated by more than 100 km during high solar flux periods compared to low solar flux periods. The Thermosphere Ionosphere Electrodynamics General Circulation Model (TIE-GCM) reproduces the main features of the field-aligned ion velocity climatology. The simulation results suggest that the plasma pressure gradient force and gravity force play a dominant role for the daytime field-aligned ion motion. The height pattern of the field-aligned ion velocity tends to be preserved in different solar activity conditions at constant pressure surfaces, but not at constant altitudes, which explains the observed dependence on solar activity. During nighttime, the effect of the neutral wind dominates the field-aligned ion velocity.",
keywords = "EISCAT, ion velocity, solar cycle variation, ionosphere, high latitude, TIE-GCM",
author = "Yosuke Yamazaki and Kosch, {Michael Jurgen} and Yasunobu Ogawa",
note = "{\textcopyright}2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.",
year = "2019",
month = may
day = "31",
doi = "10.1002/2017JA023974",
language = "English",
volume = "122",
pages = "5630--5642",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "5",

}

RIS

TY - JOUR

T1 - Average field-aligned ion velocity over the EISCAT radars

AU - Yamazaki, Yosuke

AU - Kosch, Michael Jurgen

AU - Ogawa, Yasunobu

N1 - ©2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

PY - 2019/5/31

Y1 - 2019/5/31

N2 - Long-term measurements by the European Incoherent Scatter (EISCAT) radars at Tromsø (69.6° N, 19.2° E) and Svalbard (78.2° N, 16.0° E) are used to determine the climatology of the field-aligned ion velocity in the F-region ionosphere (175–475 km) at high latitudes. The average ion velocity is calculated at various altitudes and times of day. The magnitude of the average field-aligned ion velocity is on the order of 10 m/s, similar to previous results at middle and low latitudes. The results obtained for the two radars are in good agreement. During daytime the direction of the average field-aligned ion velocity changes from downward to upward around 350 km, while during nighttime it is upward at all heights. The reversal height of the daytime field-aligned ion velocity depends on solar activity. It is elevated by more than 100 km during high solar flux periods compared to low solar flux periods. The Thermosphere Ionosphere Electrodynamics General Circulation Model (TIE-GCM) reproduces the main features of the field-aligned ion velocity climatology. The simulation results suggest that the plasma pressure gradient force and gravity force play a dominant role for the daytime field-aligned ion motion. The height pattern of the field-aligned ion velocity tends to be preserved in different solar activity conditions at constant pressure surfaces, but not at constant altitudes, which explains the observed dependence on solar activity. During nighttime, the effect of the neutral wind dominates the field-aligned ion velocity.

AB - Long-term measurements by the European Incoherent Scatter (EISCAT) radars at Tromsø (69.6° N, 19.2° E) and Svalbard (78.2° N, 16.0° E) are used to determine the climatology of the field-aligned ion velocity in the F-region ionosphere (175–475 km) at high latitudes. The average ion velocity is calculated at various altitudes and times of day. The magnitude of the average field-aligned ion velocity is on the order of 10 m/s, similar to previous results at middle and low latitudes. The results obtained for the two radars are in good agreement. During daytime the direction of the average field-aligned ion velocity changes from downward to upward around 350 km, while during nighttime it is upward at all heights. The reversal height of the daytime field-aligned ion velocity depends on solar activity. It is elevated by more than 100 km during high solar flux periods compared to low solar flux periods. The Thermosphere Ionosphere Electrodynamics General Circulation Model (TIE-GCM) reproduces the main features of the field-aligned ion velocity climatology. The simulation results suggest that the plasma pressure gradient force and gravity force play a dominant role for the daytime field-aligned ion motion. The height pattern of the field-aligned ion velocity tends to be preserved in different solar activity conditions at constant pressure surfaces, but not at constant altitudes, which explains the observed dependence on solar activity. During nighttime, the effect of the neutral wind dominates the field-aligned ion velocity.

KW - EISCAT

KW - ion velocity

KW - solar cycle variation

KW - ionosphere

KW - high latitude

KW - TIE-GCM

U2 - 10.1002/2017JA023974

DO - 10.1002/2017JA023974

M3 - Journal article

VL - 122

SP - 5630

EP - 5642

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 5

ER -