Version:2.5.0
NumericalData
ResourceID
spase://IUGONET/NumericalData/ISEE/Induction/STA/induction/64hz_ergsc_cdf
ResourceHeader
ResourceName
64Hz induction magnetometer data for Sata in CDF
ReleaseDate
2011-04-01 00:00:00
ExpirationDate
2199-12-31 00:00:00
Description
The induction magnetometer data observed at Sata, Japan. The data consist of variations of three-dimensional (H, D, and Z components) geomagnetic field taken with a sampling rate of 64 Hz, and some engineering parameters for the instrument, such as the sensitivity and phase difference. The digital data are distributed in the Common Data Format (CDF) through the ERG-SC repository. Importnat Notes: 1. For frequencies below ~1Hz, use the following equation to obtain amplitude values in units of nT/s: dB/dt (nT/s) = data (V) / quick_sensitivity. The value of quick_sensitivity is given in global attributes. For frequencies above ~1Hz, use the exact sensitivity curve to obtain absolute amplitude of waves. 2. Please note that the positive direction (polarity) of H, D, and Z are different depending on the station. For example, in February 2011, the polarity is ATH: positive=northward, eastward, upward; MGD: positive=northward, eastward, downward; PTK: positive=northward, eastward, downward; MSR: positive=southward, westward, upward; STA: positive=northward, eastward, downward. Please see http://stdb2.isee.nagoya-u.ac.jp/magne/magne_stations.html for the latest information.
Acknowledgement
1. Please contact Kazuo Shiokawa (shiokawa at isee.nagoya-u.ac.jp) before using the data for any publications and/or presentations. 2. References: Shiokawa, K., R. Nomura, K. Sakaguchi, Y. Otsuka, Y. Hamaguchi, M. Satoh, Y. Katoh, Y. Yamamoto, B. M. Shevtsov, S. Smirnov, I. Poddelsky, and M. Connors, The STEL induction magnetometer network for observation of high-frequency geomagnetic pulsations, Earth Planets Space, 62(6), 517-524, doi:10.5047/eps.2010.05.003, 2010.
Contacts
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Format
CDF
Acknowledgement
1. Please contact Kazuo Shiokawa (shiokawa at isee.nagoya-u.ac.jp) before using the data for any publications and/or presentations. 2. References: Shiokawa, K., R. Nomura, K. Sakaguchi, Y. Otsuka, Y. Hamaguchi, M. Satoh, Y. Katoh, Y. Yamamoto, B. M. Shevtsov, S. Smirnov, I. Poddelsky, and M. Connors, The STEL induction magnetometer network for observation of high-frequency geomagnetic pulsations, Earth Planets Space, 62(6), 517-524, doi:10.5047/eps.2010.05.003, 2010.
ProcessingLevel
Uncalibrated
InstrumentIDs
MeasurementType
Magnetogram
TemporalDescription
TimeSpan
StartDate
2007-09-05 00:00:00
RelativeStopDate
-P180D
Cadence
PT0.015625S
ObservedRegion
Earth.NearSurface.Ionosphere.ERegion
ObservedRegion
Earth.Magnetosphere
SpatialCoverage
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
WGS84
NorthernmostLatitude
31.02
SouthernmostLatitude
31.02
EasternmostLongitude
130.68
WesternmostLongitude
130.68
Keywords
EARTH SCIENCE Atmosphere Sun-earth Interactions Ionosphere/Magnetosphere Dynamics Magnetic Fields/Magnetic Currents
Parameter #1
Name
Epoch for the dB/dt data
ParameterKey
epoch_db_dt
Description
time label in CDF_EPOCH16 (the number of milliseconds since 01-Jan-0000) for the dB/dt data. All time values are in the universal time.
Support
Parameter #2
Name
Observation date and time for the dB/dt data
ParameterKey
time_db_dt
Description
Observation date and time for the dB/dt data. The time label for each time frame consists of an 8 element integer array for Year, month, day, hour, minute, second, milisecond, and microsecond. All time values are in the universal time
Support
Parameter #3
Name
dB/dt values for 3-component vector magnetogram
ParameterKey
db_dt
Description
Time derivative of 3-component (dH/dt, dD/dt, and dZ/dt) vector geomagnetic field observed with a sampling rate of 64 Hz. The unit is voltage [V], that is, the raw output from the instrument.
Field
Parameter #4
Name
Pulse signal from the GPS clock associated with the magnetometer
ParameterKey
time_pulse
Description
Voltage variation of the electric signal generated by the GPS clock exactly every 1 second. The resultant voltage varies in a rectangular wave manner with each rise timing corresponding to the start of each second given by GPS.
Support
Parameter #5
Name
Frequency values for the sensitivity-phase difference table
ParameterKey
frequency
Description
Frequency values in Hz for the sensitivity-phase difference table for this induction magnetometer.
Support
Parameter #6
Name
Sensitivity coefficients for the sensitivity-phase difference table
ParameterKey
sensitivity
Description
Conversion coefficients in V/nT taking into account the frequency-dependent sensitivity for this induction magnetometer.
Support
Parameter #7
Name
Phase difference values for the sensitivity-phase difference table
ParameterKey
phase_difference
Description
Phase difference in degree for each frequency used for the phase calibration
Support