5:15 PM - 6:30 PM
[SEM13-P12] Simultaneous observation of the geomagnetic field at different sites using two SQUID magnetometer systems
Keywords:geomagnetic field, SQUID, ionospheric Alfvén resonator, high sensitivity
We performed simultaneous observation test of the geomagnetic field using two superconducting quantum interference devise (SQUID) magnetometer systems at different sites. The observation sites were Nishiyama (NSY : 36.16N, 136.6E) in Hakusan-city and Minazuki (MNZ : 37.36N, 136.76E) in Wajima-city. The observation period was from 2020.9.11 to 2020.11.25.
The field resolution and field sensitivity of the SQUID magnetometer system were ~ 30 fT/√Hz at 10 Hz and ~ 77 nT/V in a flux-locked loop operation, respectively. The observed data were acquired with a 27-bit data logger with a GPS function (HKS-9700, Keisokugiken Corp.), and the sampling frequency was 200 Hz.
We could observe the Ionospheric Alfvén resonator (IAR) in the night-time at both sites. The phase of IAR signals detected at both sites was almost the same, but the amplitude of IAR signals obtained at MNZ was bigger than that obtained at NSY. We speculate the difference in amplitude is because of the difference in latitude, as known according to the previous studies. From this result, we could confirm the reliability of the simultaneous geomagnetic observation using two SQUID magnetometer systems.
In this presentation, we show the summary of the observation test and discuss the data obtained at both sites.
The field resolution and field sensitivity of the SQUID magnetometer system were ~ 30 fT/√Hz at 10 Hz and ~ 77 nT/V in a flux-locked loop operation, respectively. The observed data were acquired with a 27-bit data logger with a GPS function (HKS-9700, Keisokugiken Corp.), and the sampling frequency was 200 Hz.
We could observe the Ionospheric Alfvén resonator (IAR) in the night-time at both sites. The phase of IAR signals detected at both sites was almost the same, but the amplitude of IAR signals obtained at MNZ was bigger than that obtained at NSY. We speculate the difference in amplitude is because of the difference in latitude, as known according to the previous studies. From this result, we could confirm the reliability of the simultaneous geomagnetic observation using two SQUID magnetometer systems.
In this presentation, we show the summary of the observation test and discuss the data obtained at both sites.