64Hz induction magnetometer data for Lucky Lake in CDF

2022-01-12 01:00:00

2199-12-31 11:00:00

The induction magnetometer data observed at Lucky Lake, Canada. 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 KAP: positive=northward, eastward, upward; MGD: positive=northward, eastward, downward; ATH: 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.

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 ISEE 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.

Online

Open

CDF

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 ISEE 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.

PT0.015625S

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Epoch for the dB/dt data

epoch_db_dt

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.

Observation date and time for the dB/dt data

time_db_dt

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

dB/dt values for 3-component vector magnetogram

db_dt

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.

Pulse signal from the GPS clock associated with the magnetometer

time_pulse

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. (CAUTION) The induction magnetometer at KAP is controlled by the PC clock. Therefore this data variable does not contain any meaningful value for LCL.

Frequency values for the sensitivity-phase difference table

frequency

Frequency values in Hz for the sensitivity-phase difference table for this induction magnetometer.

Sensitivity coefficients for the sensitivity-phase difference table

sensitivity

Conversion coefficients in V/nT taking into account the frequency-dependent sensitivity for this induction magnetometer.

Phase difference values for the sensitivity-phase difference table

phase_difference

Phase difference in degree for each frequency used for the phase calibration