17:15 〜 18:45
[PEM16-P09] Bifurcation of Magnetic Field Topology using Polynomial Reconstructed MMS data
キーワード：磁気リコネクション、磁気ヌル
The space around the Earth is known to be affected by solar activities, especially solar flares and high-energy charged particles associated with coronal mass ejections (CMEs), which are considered a potential cause of satellite failures and a potential risk to the health of astronauts. In addition, infrastructure on the ground like electric power, communication, aviation, etc. may also be affected. For effective and safe utilization of space, it is necessary to correctly understand the changes in the solar-terrestrial environment, which is the environment for human existence.
A phenomenon called Magnetic Reconnection is useful to study fundamental plasma physics processes as well as space weather impacts as mentioned above. Magnetic reconnection is an elementary process in which magnetic field lines reconnect in a plasma, releasing magnetic energy as plasma energy. The magnetic energy is released by changing from a magnetic field configuration with high magnetic energy to a magnetic field configuration with low magnetic energy. Since the launch of the European Space Agency's Cluster Mission and NASA's MMS satellites, it has been possible to capture traces of the motion of plasma particles (especially electrons). Specially with MMS data, research has been actively conducted to discuss the detailed physics of the magnetic reconnection region and observational features such as velocity distribution functions. In our research, we try to understand the nature of magnetic reconnection around the Earth by confirming changes in the magnetic nulls. Using the previous studies [1][2] as a starting point, we confirm the change in magnetic field topology (bifurcation) and investigate the magnetic reconnection event that occurred on September 19, 2015.
References:
[1] “In-Situ Observation of Magnetic Null on 19 September 2015 Event Using Magnetospheric Multiscale Mission”, S. Ekawati and D. Cai, 2023
https://doi.org/10.1029/2021JA029571
[2] “Polynomial Reconstruction of the Reconnection Magnetic Field Observed by Multiple Spacecraft”, R. E. Denton, R. B. Torbert , H. Hasegawa , I. Dors , K. J. Genestreti , M. R. Argall , D. Gershman, O. Le Contel , J. L. Burch, C. T. Russell, R. J. Strangeway , B. L. Giles ,
and D. Fischer, 2020
https://doi.org/10.1029/2019JA027481
A phenomenon called Magnetic Reconnection is useful to study fundamental plasma physics processes as well as space weather impacts as mentioned above. Magnetic reconnection is an elementary process in which magnetic field lines reconnect in a plasma, releasing magnetic energy as plasma energy. The magnetic energy is released by changing from a magnetic field configuration with high magnetic energy to a magnetic field configuration with low magnetic energy. Since the launch of the European Space Agency's Cluster Mission and NASA's MMS satellites, it has been possible to capture traces of the motion of plasma particles (especially electrons). Specially with MMS data, research has been actively conducted to discuss the detailed physics of the magnetic reconnection region and observational features such as velocity distribution functions. In our research, we try to understand the nature of magnetic reconnection around the Earth by confirming changes in the magnetic nulls. Using the previous studies [1][2] as a starting point, we confirm the change in magnetic field topology (bifurcation) and investigate the magnetic reconnection event that occurred on September 19, 2015.
References:
[1] “In-Situ Observation of Magnetic Null on 19 September 2015 Event Using Magnetospheric Multiscale Mission”, S. Ekawati and D. Cai, 2023
https://doi.org/10.1029/2021JA029571
[2] “Polynomial Reconstruction of the Reconnection Magnetic Field Observed by Multiple Spacecraft”, R. E. Denton, R. B. Torbert , H. Hasegawa , I. Dors , K. J. Genestreti , M. R. Argall , D. Gershman, O. Le Contel , J. L. Burch, C. T. Russell, R. J. Strangeway , B. L. Giles ,
and D. Fischer, 2020
https://doi.org/10.1029/2019JA027481