On the energy of the poloidal magnetic field near the ionosphere

The role of the ionospheric Hall effect on the energy balance in the magnetosphere-ionosphere (MI) system coupled through the field-aligned current (FAC) is discussed. FACs lose their stored electromagnetic energy in the ionosphere through Joule dissipation; this process is caused by the closure of the FAC via the ionospheric Pedersen current carried by ions. On the other hand, the ionospheric rotational Hall current carried by electrons cannot be dissipated. However, the ionospheric rotational Hall current can also be excited by an incident FAC, causing it to radiate Poynting fluxes that lead to the growth of a poloidal-type magnetic field in the magnetosphere and atmosphere. From the viewpoint of energy conservation, a few ambiguities in the above statements may be recognized. In this paper, we clarify the energy balance of the electromagnetic disturbances between the magnetosphere, ionosphere and atmosphere. The generation of the Hall current (together with the associated poloidal magnetic field) will be shown to occur during the growth stage, when the electromagnetic energy is pumped through the divergent Hall current, regardless of how slow the growth may have been

A Comprehensive Geometric Description of Time-Evolving Magnetic Fields via Magnetic Frenet-Affine Connection

The 15th Symposium on Polar Science/Ordinary sessions [OS] Space and upper atmospheric sciences, Wed. 4 Dec. / 3F Conference room, The Institute of Statistical Mathematicsconference outpu

Evolution of the current system during solar wind pressure pulses based on aurora and magnetometer observations

Additional file 2: Figure S2. Same as Additional file 1 but for the July 14, 2012, event

Geometric Structure of Magnetic Fields in Earth's Magnetosphere: The Role of the Hall Effect

The 15th Symposium on Polar Science/Ordinary sessions [OS] Space and upper atmospheric sciences, Wed. 4 Dec. / Entrance Hall (1st floor), National Institute of Polar Researchconference outpu

Quantum Calculation of Classical Kinetic Equations: A Novel Approach for Numerical Analysis of 6D Boltzmann-Maxwell Equations in Collisionless Plasmas Using Quantum Computing

A novel quantum algorithm for solving the Boltzmann-Maxwell equations of the 6D collisionless plasma is proposed. The equation describes the kinetic behavior of plasma particles in electromagnetic fields and is known for the classical first-principles equations in various domains, from space to laboratory plasmas. We have constructed a quantum algorithm for a future large-scale quantum computer to accelerate its costly computation. This algorithm consists mainly of two routines: the Boltzmann solver and the Maxwell solver. Quantum algorithms undertake these dual procedures, while classical algorithms facilitate their interplay. Each solver has a similar structure consisting of three steps: Encoding, Propagation, and Integration. We conducted a preliminary implementation of the quantum algorithm and performed a parallel validation against a comparable classical approach. IBM Qiskit was used to implement all quantum circuits.Comment: 18 pages, 7 figure

Latitudinal dependence of Pc3-4 amplitudes across the dip equator along the 210º Magnetic Meridian

Studying Pc3-4 geomagnetic pulsations at equatorial and very low latitude regions is an important issue to understand their generation and propagation mechanisms. Pc3-4 amplitudes and their latitudinal dependency across the dip equator up to low latitudes (± 25°) are investigated using geomagnetic data simultaneously obtained by the MAGDAS/CPMN stations along the 210° Magnetic Meridian (MM) chain. Forty-five Pc3 events and thirty-two Pc4 events were selected for this study. Our results show a clear dependence of Pc3-4 amplitudes on geomagnetic latitudes. At the dip equator, most of the selected Pc3 events (~75%) showed an enhancement in amplitudes, while the rest (~25%) showed an attenuation. After that, the amplitudes decreased gradually by increasing latitudes. These results suggest mixed generation and propagation mechanisms for the equatorial and very low latitudes Pc3s. For better understanding, the Interplanetary Magnetic Field (IMF) and solar conditions are examined during the selected events. Results indicate that Pc3 events with enhanced amplitudes at dip equator are mainly occurred in daytime with no preference to IMF (magnitude and direction) and solar parameters, which suggests the ionospheric currents model as a generation and propagation mechanism for these events. While the attenuation observed in the other Pc3 events was associated with intense and abrupt fluctuations in the IMF and solar parameters, which in turn suggests the compressional wave model for generating these Pc3 events. On the other hand, these two models can explain the observed enhancement in the Pc4 amplitudes at the dip equator. Therefore, our obtained results clarified the origin of equatorial Pc3-4 pulsations

Progress of the SDR-based dual-band scintillation detector development and its application for space weather study

第150回地球電磁気・地球惑星圏学会（SGEPSS）総会および講演会, 2021年10月31日-11月4

Development of 2U CubeSat YOTSUBA-KUlover for Geomagnetic Field Measurement by Undergraduate Student Satellite Project

Kyushu Institute of Technology(Kyutech) have developing small satellites since 2006. Three satellites, AOBA-Velox III, FUTABA and MITSUBA(Unfortunately, lost due to rocket launch failure) have been developed in a student satellite project. This satellite project is promoted by under graduate students. The students conduct all of satellite development process as design, integration, test, safety document preparation and operation. Students can learn the satellite development process through hands-on. Fourth satellite is 2U Cube satellite for measurement of geomagnetic field YOTSUBA-KUlover and this program is a joint program with Kyushu University. It is the first satellite developed by Kyutech students project to conduct a science oriented mission. The International Space and Planetary Environment Science Center (i-SPES) at Kyushu University has been conducting international observations of the geomagnetic field for many years, and the center support the development of magnetic field sensor. Kyutech students developed bus system based on the past satellite heritage and Kyushu University students developed a mission component for geomagnetic field measurement and camera for aurora measurement. The main mission of the YOTSUBA-KUlover is a precise measurement of geomagnetic field with an accuracy of 0.1 nT to observe the magnetic perturbations related to the magnetic storms and/or aurora substorms. To achieve this accuracy, a deployable boom was developed to reduce the effect of satellite residual magnetic field. In addition, the effect of the operation of each bus component on the magnetic sensor was investigated in a magnetic calibration facility in Kyushu University. YOTSUBA-KUlover will be launched in FY2024 and currently flight model is being developing. The presentation will introduce the specifications of the satellite and discuss the progress of the development and the problems specific to student satellite projects

The Development of the YOTSUBA-KULOVER Satellite Project

conference pape