ResourceName
Kakioka geomagnetic field 1-minute digitized data in IAGA-2002 format, extracted from magnetograms
ReleaseDate
2013-03-29 00:00:00
Description
The geomagnetic field 1-minute digitized data in IAGA-2002 format, extracted from magnetograms at Kakioka (KAK). We evaluated the differences between the digital data obtained from the fluxgate magnetometer and the values extracted from magnetograms during the period of August 1994. Standard deviation of the differences for 60-minutes were less than 0.2nT (for H,Z) or 0.02' (for D) in a ratio of 99.5%, 99.6% and 98.7% for H, Z and D components, respectively, according to the data from August 1994. The data from the 58th minute to the 2nd minute of every hour may include reading errors of less than 2 nT due to crossing with the time marks on the magnetogram. When a trace is overlapped with a baseline on the magnetogram, the missing value with 99999 may be embedded. For details, refer to 'Mashiko, N. et al., 2012: Digitization of bromide paper records to extract one-minute geomagnetic data. Proceedings of 1st ICSU-WDS conference "Global data for global science", Kyoto, 251-254.' [Available online at www.icsu-wds.org.]
Acknowledgement
If the data are used in publications and presentations, the Kakioka Magnetic Observatory of the Japan Meteorological Agency should be acknowledged properly. This work was supported in part by the Japan Society for the Promotion of Science, Grant-in-Aid for Publication of Science Research Results (Grant 248032, 268023) and Cooperative Research on Database Construction of Geospace Research Center, Solar-Terrestrial Environment Laboratory, Nagoya University.
Contacts
Name
Geomagnetic field digitized from magnetograms
Description
One-minute values are calculated as averages of 7.62-second values, centered on the minute. Then one-minute values are calibrated using absolute values observed at a one-week interval. D(eastward+)[arc minute], H[nT], Z(downward+)[nT], F[nT]
Field
Qualifier
Vector
FieldQuantity
Magnetic