TY - JOUR
T1 - Seeding of Equatorial Plasma Bubbles by Vertical Neutral Wind
AU - Yokoyama, Tatsuhiro
AU - Jin, Hidekatsu
AU - Shinagawa, Hiroyuki
AU - Liu, Huixin
N1 - Funding Information:
This work was supported by JSPS KAKENHI grant 16K17814. H. L. was supported by JSPS KAKENHI grants 18H01270, 18H04446, and 17KK0095. This work was carried out as a computational joint research program at Institute for Space-Earth Environment Research, Nagoya University, Japan. The simulation was also performed by using Hitachi SR16000/M1 at the National Institute of Information and Communications Technology (NICT), Japan. The numerical code used for this study requires high-performance computers and is not prepared for publicly accessible servers. The simulation results used in this study are available at the following repository: https://doi.org/10.5281/zenodo.2782922.
Funding Information:
This work was supported by JSPS KAKENHI grant 16K17814. H. L. was supported by JSPS KAKENHI grants 18H01270, 18H04446, and 17KK0095. This work was carried out as a computational joint research program at Institute for Space-Earth Environment Research, Nagoya University, Japan. The simulation was also performed by using Hitachi SR16000/M1 at the National Institute of Information and Communications Technology (NICT), Japan. The numerical code used for this study requires high-performance computers and is not prepared for publicly accessible servers. The simulation results used in this study are available at the following repository: https://doi. org/10.5281/zenodo.2782922.
Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.
PY - 2019/7/16
Y1 - 2019/7/16
N2 - The seeding mechanism of equatorial plasma bubbles (EPBs) in the ionosphere has not been fully understood for several decades. Before investigating the complex seeding process by atmospheric gravity waves, which have been considered as a possible candidate, we investigate the vertical neutral wind effect on the EPB seeding by making the numerical simulation setup as simple as possible. It is presented that the vertical wind over the dip equator with an amplitude of as low as 5 m/s can seed EPBs effectively. The upward wind reduces the eastward current and produces the eastward polarization electric field, so that the bottomside F region pushed by the upward wind is going to form upwellings and penetrate into the topside F region accelerated by the Rayleigh-Taylor instability. It is suggested that the vertical wind perturbations driven by gravity waves should play an important role in seeding EPBs.
AB - The seeding mechanism of equatorial plasma bubbles (EPBs) in the ionosphere has not been fully understood for several decades. Before investigating the complex seeding process by atmospheric gravity waves, which have been considered as a possible candidate, we investigate the vertical neutral wind effect on the EPB seeding by making the numerical simulation setup as simple as possible. It is presented that the vertical wind over the dip equator with an amplitude of as low as 5 m/s can seed EPBs effectively. The upward wind reduces the eastward current and produces the eastward polarization electric field, so that the bottomside F region pushed by the upward wind is going to form upwellings and penetrate into the topside F region accelerated by the Rayleigh-Taylor instability. It is suggested that the vertical wind perturbations driven by gravity waves should play an important role in seeding EPBs.
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U2 - 10.1029/2019GL083629
DO - 10.1029/2019GL083629
M3 - Article
AN - SCOPUS:85068534091
SN - 0094-8276
VL - 46
SP - 7088
EP - 7095
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 13
ER -