This dataset contains 1-second geomagnetic vector and scalar data from the magnetometer station Macapa. The data is from 15-Nov-2019 to 07-Dec-2019, from 07-Feb-2020 to 05-Apr-2020, and from 09-Oct-2020 to 21-Nov-2020. The data files follow the IAGA-2002 data format. The IAGA format description is copied from https://www.ncei.noaa.gov/services/world-data-system/v-dat-working-group/iaga-2002-data-exchange-format and from https://www.ncei.noaa.gov/sites/default/files/2022-07/IAGA%202002%20July%202003%20Revision.txt. Both documents were downloaded on 2024-08-11 and are available here as IAGA_2002_file_format_description_2024-08-11.pdf.
The data themselves are described in Mendel Martins et al. (2024).
The data set contains hourly mean values (HMV) of the horizontal magnetic field component H as measured at the geomagnetic observatory Huancayo for 1935 to 1985. Huancayo (IAGA code HUA) is located close to the magnetic equator and is operated by Instituto Geofisico del Peru.
The HMVs were taken from the World Data Centre Kyoto (WDC Kyoto) and existing data gaps (in total some 19 years from the 1960ies, 1970ies and 1980ies) were filled in by typing handwritten records of the HMV at GFZ. These handwritten records were monthly tables that were received as digital images from geomagnetic observatory Huancayo or that were received as microfilms from World Data Centre Boulder, Colorado. We also produced digital images of these microfilms. The values from the WDC Kyoto are definitive values; the monthly tables presumably also contain definitive values.
Corrections to HUA HMVs from WDC Kyoto: There is a known error in the time stamping of the HUA HMVs prior to 1948 (before 1948 the data was reported in local time, rather than universal time). This error is corrected in the present dataset. Also, an attempt was made to correct for a jump in the HMV time series at this time. For further corrections, see Matzka et al, 2017.
Please note that a dataset based on the data provided here will be submitted to the WDC Kyoto at a later stage and might undergo further modifications.
The data file is in ASCII format and contains blank-separated first the year (YYYY), the month (MM), the day (DD) followed by the 24 HMVs of H (format HHHHH) in nanotesla (nT), starting with the HMV for 00 to 01 universal time.Geomagnetic observatories are described in e.g. Jankowski and Sucksdorf (1996).
This dataset comprises hourly mean values of the horizontal geomagnetic field component H measured at the geomagnetic observatories Tatuoca (TTB, latitude: -1.205°, longitude: 311.487°, elevation: 5 m, Brazil) and Huancayo (HUA, latitude: -12.050°, longitude: -284.670°, elevation: 3313 m, Peru) for the period January 1st, 1957 to December 31st, 2019.
TTB data from 1957 to May 2008 is described in the scientific publication Soares et al. (2020), to which this data publication is supplement to. This data comes from Observatório Nacional's archives and we expect to submit a final version of this data to WDC Edinburgh at a later point in time. From June 2008 to December 2017 we use hourly mean values calculated from the minute means available at Soares et al (2018). For 2018, we use quasi-definitive data from Observatório Nacional's archives. From January 2019 to July 22nd 2019, we use preliminary data from Observatório Nacional's archives. From July 23rd 2019 to December 2019, we use preliminary data from INTERMAGNET.
For HUA from 1957 to 2001 we give new corrected data here that are based on earlier data publications (Matzka et al, 2017; Matzka et al., 2018). We plan to submit a final version of this data to WDC Edinburgh at a later point in time. From 2002 to 2014 we use definitive data from INTERMAGNET/WDC Edinburgh. From January 2015 to April 2015, we use quasi-definitive data from INTERMAGNET. From May 2015 to December 2019 we use variation data from INTERMAGNET.
The data files are provided in the IAGA-2002 format (https://www.ngdc.noaa.gov/IAGA/vdat/IAGA2002/iaga2002format.html). Geomagnetic observatories are described in e.g. Jankowski and Sucksdorff (1996).
The dataset contains hourly mean values (HMV) of the horizontal magnetic field component H as measured at the geomagnetic observatory Huancayo for 1958 to 2013. Huancayo observatory (IAGA code HUA) is operated by Instituto Geofisico del Peru. This dataset is based on and partly supersedes the data publication Matzka et al. (2017a), which is described in Matzka et al. (2017b). It will be superseded by another data publication (Soares et al., in preparation) that we intend to publish at GFZ Data Services as well as the World Data Centres for Geomagnetism.As already described in Matzka et al. (2017a, 2017b), the HMVs were taken from the World Data Centre Kyoto (WDC Kyoto) and data gaps (in total some 19 years from the 1960ies, 1970ies and 1980ies) were filled in by typing handwritten records of the HMV at GFZ. These handwritten records were monthly tables that were received as digital images from geomagnetic observatory Huancayo or that were received as microfilms from World Data Centre Boulder. We also produced digital images of these microfilms. The values from the WDC Kyoto are definitive values; the monthly tables presumably also contain definitive values. Corrections to HUA HMVs from WDC Kyoto: There is a known error in the time stamping of the HUA HMVs prior to 1948 (before 1948 the data was reported in local time, rather than universal time). This error is corrected in the present dataset. Also, an attempt was made to correct for a jump in the HMV time series at this time. Further corrections, made to the dataset by Matzka et al. (2017a), are mostly the correction or deletion of outliers and the correction of shifts in the data.Again, please note that a dataset based on the data provided here will be submitted to the World Data Centres for Geomagnetism at a later stage and will have some additional modifications (Soares et al., in preparation).The data file is in ASCII format and contains blank-separated first the year (YYYY), the month (MM), the day (DD) followed by the 24 HMVs of H (format HHHHH) in nanotesla (nT), starting with the HMV for 00 to 01 universal time. Geomagnetic observatories are described in e.g. Jankowski and Sucksdorf (1996), in Matzka et al., (2010) and Matzka (2016).
This dataset comprises preliminary minute means of the XYZ (X=geographic north, Y=geographic east, Z=downward) magnetic field components measured at the geomagnetic observatory Tatuoca (IAGA code TTB) for the period June 1st, 2008 to December 31st, 2017. TTB is located in northern Brazil and operates under the administration of Observatório Nacional (ON) since 1957. Since 2015 it is operated in cooperation between ON and GFZ.Since the early years of the 2000 decade, the magnetic equator is close to the observatory TTB.The variations from June 1st 2008 until November 19th, 2015 were recorded by a LEMI-417M fluxgate magnetometer (sampling rate during most of this period was 1 sec, but occasionally 0.25 or 6 sec). From November 20th, 2015 onwards, a DTU FGE fluxgate magnetometer (1 sec sampling) provided the variations. From late October 2016, the total field F was measured with a Gemsys overhauser absolute scalar magnetometer with 1 sec sampling.This is a processed and calibrated dataset. Inconsistencies like spikes and data jumps were corrected. The maximum admitted noise level in this dataset is 1 nT peak to peak in the underlying 1 sec data. Periods of recurrent noise exceeding this criterion were systematically deleted from the records. For data calibration, the baseline was constructed by means of absolute measurements of the geomagnetic field and applied to the variation data.The data files are provided in the IAGA-2002 format (https://www.ngdc.noaa.gov/IAGA/vdat/IAGA2002/iaga2002format.html) as daily files for 1-minute means. Following the IAGA2002-format, the filename consists of the IAGA-code, the year (YYYY), the month (MM), the day (DD), the letter p for preliminary, the letters min for 1-minute data, and the file extension min again for 1-minute data. The first 16 lines in each file are a IAGA2002-typical header, then comes, blank separated, the date (YYYY-MM-DD), time (hh:mm:ss.sss in UTC), day of year (DOY), the X component (XXXXX.XX in nT), the Y-component (YYYYY.YY in nT), the Z-component (ZZZZZ.ZZ in nT) and F (FFFFF.FF in nT).Please note that a dataset based on the data provided here will be submitted to the World Data Centre for Geomagnetism (WDC Edinburgh) at a later stage and might undergo further modifications.Geomagnetic observatories in general are described in e.g. Jankowski and Sucksdorff (1996), Matzka et al. (2010). GFZ observatories and observatory cooperations are described in Matzka (2016). The Geomagnetic Observatory Tatuoca (TTB) is described in Moschhauser et al. (2017).