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| Title: | Mid-latitude Geomagnetic Indices ASY and SYM (ASY/SYM Indices) |
| Authors: | World Data Center for Geomagnetism, Kyoto Imajo, Shun  https://orcid.org/0000-0002-9862-844X (unconfirmed)Matsuoka, Ayako https://orcid.org/0000-0001-5777-9711 (unconfirmed)Toh, Hiroaki Iyemori, Toshihiko |
| Keywords: | geomagnetic activity index |
| Issue Date: | 7-Jan-2022 |
| Publisher: | World Data Center for Geomagnetism, Kyoto |
| Abstract: | The ASY/SYM index was developed by Iyemori [1990] to describe the longitudinally asymmetric and symmetric geomagnetic disturbance fields in middle-latitudes with 1-minute resolution. It is derived from geomagnetic field variations in the H and D components measured at 6 geomagnetic observatories selected from 11 geomagnetic observatories at middle latitudes. |
| Description: | 【Update frequency】 Indices of the previous month are added once a month. 【Observatory Location】 [San Juan] geographic latitude: 18.110 geographic longitude: 293.850 [Fredericksburg] geographic latitude: 38.200 geographic longitude: 282.630 [Boulder] geographic latitude: 40.130 geographic longitude: 254.760 [Tucson] geographic latitude: 32.170 geographic longitude: 249.270 [Honolulu] geographic latitude: 21.320 geographic longitude: 202.000 [Memambetsu] geographic latitude: 43.910 geographic longitude: 144.189 [Urumqi] geographic latitude: 43.800 geographic longitude: 87.700 [Alibag] geographic latitude: 18.638 geographic longitude: 72.872 [Martin de Vivies] geographic latitude: -37.796 geographic longitude: 77.574 [Hermanus] geographic latitude: -34.425 geographic longitude: 19.225 [Chambon-la-Foret] geographic latitude: 48.025 geographic longitude: 2.261 [Alma-Ata] geographic latitude: 43.250 geographic longitude: 76.920 【Citation】 World Data Center for Geomagnetism, Kyoto, S. Imajo, A. Matsuoka, H. Toh, and T. Iyemori (2022), Mid-latitude Geomagnetic Indices ASY and SYM (ASY/SYM Indices), doi:10.14989/267216. 【Contact person】 Shun Imajo (orcid:0000-0002-9862-844X), Ayako Matsuoka (orcid:0000-0001-5777-9711) |
| Rights: | The DOI of ASY/SYM data used in the paper must be identified in the Data Availability Statement or Reference section, in accordance with the guidelines and/or recommended practices of the journal. |
| DOI: | 10.14989/267216 |
| URI: | http://hdl.handle.net/2433/267216 |
| Related Link: | https://doi.org/10.5636/jgg.42.1249 |
| Appears in Collections: | Research Data |
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