2.7.1 https://spdx.org/licenses/ SPDX CC-BY-NC-4.0 https://spdx.org/licenses/CC-BY-NC-4.0.html Creative Commons Attribution Non Commercial 4.0 International The Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license allows users to share, copy, and adapt material in any medium or format, provided they give appropriate credit (attribution) and use the material only for non-commercial purposes. spase://CNES/NumericalData/CDPP-AMDA/Indices/Ground_Based/ground-based-asy Indices - Ground Based - asy/sym Longitudinally asymmetric and symmetric horizontal component disturbances https://doi.org/10.14989/267216 2026-03-19T02:25:06Z 2026-03-19T02:25:06Z Posted by JMW. To describe the geomagnetic disturbances at mid-latitudes in terms of longitudinally asymmetric (ASY) and symmetric (SYM) disturbances for both H and D components respectively parallel and perpendicular to the dipole axis. SYM-H is essentially the same as the Dst index with a different time resolution. WDC Kyoto and ISGI website at EOST; ASY/SYM Citation: World Data Center for Geomagnetism, Kyoto, Imajo S., Matsuoka A., Toh H. and Iyemori T. (2022) - Mid-latitude Geomagnetic Indices ASY and SYM (ASY/SYM Indices), https://doi.org/10.14989/267216 License: CC BY https://creativecommons.org/licenses/by/4.0/ spase://CNES/Person/CDPP-AMDA/WDC TechnicalContact spase://SMWG/Person/Aude.Chambodut TechnicalContact spase://SMWG/Person/James.M.Weygand MetadataContact WDC for Geomagnetism - Kyoto, Japan https://wdc.kugi.kyoto-u.ac.jp/ ASY/SYM geomagnetic indices https://isgi.unistra.fr/indices_asy.php spase://SMWG/Repository/CDPP/AMDA Online Open CDPP/AMDA HAPI Server https://amda.irap.omp.eu/service/hapi ground-based-asy Web Service to this product using the HAPI interface. CSV Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse". See the Rules of the road at https://amda.cdpp.eu/help/policy.html . Please acknowledge the Data Providers. spase://SMWG/Repository/CDPP/AMDA Online Open CDPP/AMDA Web application https://amda.cdpp.eu Access to Data via CDPP/AMDA Web application. CSV VOTable CDF PNG Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse". See the Rules of the road at https://amda.cdpp.eu/help/policy.html . Please acknowledge the Data Providers. WDC Kyoto via ISGI spase://CNES/Instrument/CDPP-AMDA/Indices/Ground_Based MagneticField 1981-01-01T00:00:00Z 2025-04-30T23:59:00Z PT1M Earth.NearSurface.EquatorialRegion asy asy nT 3 asy-h 1 asy(0) asy-d 2 asy(1) Magnetic sym sym nT 3 sym-h 1 sym(0) sym-d 2 sym(1) Magnetic