Startospheric Electric Fields and Currents Measured at Syowa Station, Antarctica
The measurements of vector electric fields and currents were made with two plastic balloons of 5,000 m^3 launched from Syowa Station (L=8.4), Antarctica, on 28 November and 29 December, 1972. The results give the following. (1) The vertical electric field and current at the altitude of 30km are 0.12...
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National Institute of Polar Research
1975
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fttriple:oai:gotriple.eu:oai:doaj.org/article:006987ea4a3547dbb6a2fc7c772453c4 2023-05-15T13:38:53+02:00 Startospheric Electric Fields and Currents Measured at Syowa Station, Antarctica Yoshikazu TANAKA Toshio OGAWA Masahiro KODAMA 1975-12-01 https://doi.org/10.15094/00007830 https://doaj.org/article/006987ea4a3547dbb6a2fc7c772453c4 en other eng National Institute of Polar Research doi:10.15094/00007830 0085-7289 2432-079X https://doaj.org/article/006987ea4a3547dbb6a2fc7c772453c4 undefined Antarctic Record, Iss 54, Pp 18-33 (1975) geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 1975 fttriple https://doi.org/10.15094/00007830 2023-01-22T19:15:58Z The measurements of vector electric fields and currents were made with two plastic balloons of 5,000 m^3 launched from Syowa Station (L=8.4), Antarctica, on 28 November and 29 December, 1972. The results give the following. (1) The vertical electric field and current at the altitude of 30km are 0.12-0.21 V/m and 1.3-2.2 x10^ A/m^2 respectively, and their diurnal variations are roughly consistent with the expected variation from the average world-wide thunderstorm activity. (2) The electrical conductivities were estimated from the ratio of the electric current to the electric field giving the average value of 1 x 10^ mho/m at the altitude of 30 km. This value is about twice as large as that in Japan. This can be explained by the latitudinal effect of the cosmic ray ionization in the atmosphere. (3) Enhancements of the electric field and current were observed in both vertical and horizontal components of the magnitude of about 80 mV/m and 0.8 x 10^ A/m^2 respectively at an initial stage of a magnetic substorm. The vertical electric field on the ground was also correspondingly enhanced by about 80 V/m at the same time. (4) Comparisons of observed horizontal electric field vectors with the magnetic fields observed at Syowa Station show that the magnetic field variations are caused by the ionospheric Hall current. (5) One hour averages of the horizontal electric field show large scale convection fields consistent with S^p_q in the polar ionosphere and with DP-2 in the equatorial magnetosphere. The average ionospheric and magnetospheric equatorial electric fields were 40 mV/m and 0.98 mV/m respectively, and corresponding plasma convection velocities were estimated to be 700 m/s and 22 km/s respectively. Article in Journal/Newspaper Antarc* Antarctica Unknown Syowa Station |
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language |
English |
topic |
geo |
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geo Yoshikazu TANAKA Toshio OGAWA Masahiro KODAMA Startospheric Electric Fields and Currents Measured at Syowa Station, Antarctica |
topic_facet |
geo |
description |
The measurements of vector electric fields and currents were made with two plastic balloons of 5,000 m^3 launched from Syowa Station (L=8.4), Antarctica, on 28 November and 29 December, 1972. The results give the following. (1) The vertical electric field and current at the altitude of 30km are 0.12-0.21 V/m and 1.3-2.2 x10^ A/m^2 respectively, and their diurnal variations are roughly consistent with the expected variation from the average world-wide thunderstorm activity. (2) The electrical conductivities were estimated from the ratio of the electric current to the electric field giving the average value of 1 x 10^ mho/m at the altitude of 30 km. This value is about twice as large as that in Japan. This can be explained by the latitudinal effect of the cosmic ray ionization in the atmosphere. (3) Enhancements of the electric field and current were observed in both vertical and horizontal components of the magnitude of about 80 mV/m and 0.8 x 10^ A/m^2 respectively at an initial stage of a magnetic substorm. The vertical electric field on the ground was also correspondingly enhanced by about 80 V/m at the same time. (4) Comparisons of observed horizontal electric field vectors with the magnetic fields observed at Syowa Station show that the magnetic field variations are caused by the ionospheric Hall current. (5) One hour averages of the horizontal electric field show large scale convection fields consistent with S^p_q in the polar ionosphere and with DP-2 in the equatorial magnetosphere. The average ionospheric and magnetospheric equatorial electric fields were 40 mV/m and 0.98 mV/m respectively, and corresponding plasma convection velocities were estimated to be 700 m/s and 22 km/s respectively. |
format |
Article in Journal/Newspaper |
author |
Yoshikazu TANAKA Toshio OGAWA Masahiro KODAMA |
author_facet |
Yoshikazu TANAKA Toshio OGAWA Masahiro KODAMA |
author_sort |
Yoshikazu TANAKA |
title |
Startospheric Electric Fields and Currents Measured at Syowa Station, Antarctica |
title_short |
Startospheric Electric Fields and Currents Measured at Syowa Station, Antarctica |
title_full |
Startospheric Electric Fields and Currents Measured at Syowa Station, Antarctica |
title_fullStr |
Startospheric Electric Fields and Currents Measured at Syowa Station, Antarctica |
title_full_unstemmed |
Startospheric Electric Fields and Currents Measured at Syowa Station, Antarctica |
title_sort |
startospheric electric fields and currents measured at syowa station, antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1975 |
url |
https://doi.org/10.15094/00007830 https://doaj.org/article/006987ea4a3547dbb6a2fc7c772453c4 |
geographic |
Syowa Station |
geographic_facet |
Syowa Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Antarctic Record, Iss 54, Pp 18-33 (1975) |
op_relation |
doi:10.15094/00007830 0085-7289 2432-079X https://doaj.org/article/006987ea4a3547dbb6a2fc7c772453c4 |
op_rights |
undefined |
op_doi |
https://doi.org/10.15094/00007830 |
_version_ |
1766112128541917184 |