Introduction
Welcome to project SSA P3-SWE-XXXVII SWE Products for Southern Europe (Phase 1)'s web portal for the retrieval of the geomagnetic observations from Observatório Geofísico e Astronómico da Universidade de Coimbra's (OGAUC). Additionally, you can find here other tools for downloading OGAUC's geomagnetic data and monitorisarion of the Data Sharing Service's quality.More about OGAUC's geomagnetic observatory
The University of Coimbra has been responsible for regular observations of the Earth's magnetic field since 1866. Currently the magnetic observatory of Coimbra, designated COI by the International Association of Geomagnetism and Aeronomy (IAGA), is managed by OGAUC.The COI magnetic observatory is located at OGAUC's facilities in Alto da Baleia street, Coimbra (geographic coordinates: lat. 40.222°N, lon. 351.578°E, alt. 99.0m; geomagnetic coordinates: lat. 43.8°N, lon.72.1°E). Its instrumentation includes a DI-flux magnetometer (consisting of a fluxgate sensor MAG-01H mounted on a YOM MG2KP steel-free theodolite) and a scalar proton type magnetometer (Overhauser GSM-90F), for the absolute measurements, and a tri-axial fluxgate variometer (FGE model, Suspended version) for the continuous recordings of the nagnetics variations of the HDZ components. Absolute measurements are acquired weekly (following the standard procedures), while the continuous observations are recorded at a 1Hz rate.
The observations provided here were automatically processed. In particular, a provisional calibration of the data is obtained following the standard procedures and a linear interpolation of the baseline defined here. For this reason, we can not exclude the existence of magnetically polluted data, spikes or wrong values resulting from malfunctions of the data logger.
Website layout
https://www.mat.uc.pt/~obsv/SWE-MED/SWEMED_main.htm - Web portal for the retrieval of the geomagnetic observations from Observatório Geofísico e Astronómico da Universidade de Coimbra's (OGAUC), and repository of computational tools for retrieving this data.https://www.mat.uc.pt/~obsv/SWE-MED/SWEMED_retrieval.htm - Web interface for downloading Coimbra's geomagnetic observations
https://www.mat.uc.pt/~obsv/SWE-MED/SWEMED_software.htm - Repository of tools developed in scope of project SSA P3-SWE-XXXVII SWE Products for Southern Europe (Phase 1).
https://www.mat.uc.pt/~obsv/SWE-MED/SWEMED_usage_API.htm - Instructions on how to download our data using a command prompt.
https://www.mat.uc.pt/~obsv/SWE-MED/SWEMED_task scheduling.htm - Instructions on how to schedule data download in Linux and Windows environments,
https://www.mat.uc.pt/~obsv/SWE-MED/SWEMED_usage_prompt.htm - Instructions on how to download our data using th
https://www.mat.uc.pt/~obsv/SWE-MED/MIN/ - repository of the geomagnetic data files as generated by the data logger (".MIN" files)
https://www.mat.uc.pt/~obsv/SWE-MED/MINwdc/ - repository of the raw geomagnetic observations in the IAGA2002 file exchange format ("raw.min" files)
https://www.mat.uc.pt/~obsv/SWE-MED/MINcal/ - repository of the calibrated geomagnetic observations ("cal.min" files)
Files available:
.MIN files - Raw geomagnetic data files as generated by the data logger. The files' name is as follows: MMMDDYY.MIN, in which MMM corresponds to the first three letters of the month in which the observation was acquired ('JAN', 'FEB', 'MAR',etc.), DD corresponds to the day of the month while YY corresponds to the last two digits of the year. The first two columns of each file correspond the hour an minute associated with each datapoint (in UT). The next three columns correspond to the three components (nortwards, eastwards and downwards) components of the magnetic field (as they came from the variometer) while the last column corresponds to the absolute strength of the magnetic field as measured by the protom magnetometer. In the case of problems with the data logger (for instance being temporarily down) one or more data columns may be missing.raw.min files - raw geomagnetic observations in the IAGA 2002 data exchange format, in which all missing datapoints are represented as 99999.99. The name of these files is "coiYYYYMMDDraw.min". The first three letters correspond to IAGA's designation of our observatory, while the following eight digits are respectively, the year, month and day in which the observation was acquired.
cal.min files - files containing a preliminary calibration of Coimbra's data, obtained using a linear interpolation of the baseline defined here. Data provided in the IAGA2002 data exchange format. The name of these files is "coiYYYYMMDDcal.min", in which, again the first three letters correspond to IAGA's designation of our observatory, while the following eight digits are respectively, the year, month and day in which the observation was acquired.
In this manner, the web address "https://www.mat.uc.pt/~obsv/SWE-MED/MIN/JAN0322.MIN" allows to retrieve the original geomagnetic observation of the Coimbra observatory for the 3rd of January of 2022, while typing in a web browser's URL bar "https://www.mat.uc.pt/~obsv/SWE-MED/MINcal/coi20220103cal.min" displays the preliminary calibration of the geomanetic observations for the same date.