Investigating the conditions of ELF/VLF wave propagation from space to the ground.

研究 ELF/VLF 波从太空到地面传播的条件。

• 批准号: 22K14083
• 负责人: Martinez・Calderon Claudia
• 金额: $ 2.91万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22K14083/
• 关键词: VLF waves; conjugated events; bursty-patches; ionospheric exit point; vlf waves; multipoint observations; magnetosphere; geospace; ionosphere

We installed a VLF receiver in Oulujarvi, Finland (OUJ) located 450 km south of the existing receiver at Kannuslehto (KAN). KAN is 400 km west of the receiver at Lovozero (LOZ). We investigated characteristics of conjugated events between KAN and LOZ. A 1-month study of conjugated events between OUJ and KAN found 33 cases of one-to-one correspondence (same waves/source region). These cases give us an estimation of the latitudinal extent of VLF waves (450 km) and insight into VLF occurrence (~30% of total observations show one-to-one correspondence). Through polarization analysis, the investigation of the evolution of their ionospheric exit point is underway. We have also started long term plans for statistical analysis of OUJ and KAN data for conjugated events and VLF bursty-patches.

我们在芬兰Oulujarvi（OUJ）安装了一个甚低频接收器，位于Kannuslehto（KAN）现有接收器以南450公里处。KAN位于Lovozero（LOZ）接收器以西400公里。我们研究了KAN和LOZ之间的共轭事件的特性。对OUJ和KAN之间的共轭事件进行了为期1个月的研究，发现了33例一一对应的情况（相同的波/源区域）。这些情况使我们能够估计甚低频波的纬度范围（450公里），并深入了解甚低频的发生情况（约30%的观测结果显示一一对应）。通过极化分析，对它们的电离层出口点的演化进行了研究。我们还开始了对共轭事件和VLF爆发斑的OUJ和KAN数据进行统计分析的长期计划。

项目成果

QL 10-min spectra data from OUJ receiver

来自 OUJ 接收器的 QL 10 分钟光谱数据

Study on the longitudinal extent of QP emissions using conjugated events observed by PWING stations

利用 PWING 站观测到的共轭事件研究 QP 排放的纵向范围

• 发表时间: 2022
• 作者: Martinez-Calderon;C.;T. Oonishi;K. Shiokawa;J. Manninen;M. Ozaki;S. Oyama and the PWING team
• 通讯作者: S. Oyama and the PWING team

Spectra data from OUJ receiver (CDF files)

来自 OUJ 接收器的光谱数据（CDF 文件）

Propagation of VLF conjugated events at sub-auroral latitudes from multi-point observations in Fennoscandia and the inner magnetosphere.

根据 Fennoscandia 和内磁层的多点观测，VLF 共轭事件在亚极光纬度的传播。

• 发表时间: 2022
• 作者: C. Martinez-Calderon;Y. Katoh;O. Santolik;M. Hanzelka;J. Manninen;Y. Miyoshi;Y. Kasahara;F. Tsuchiya;I. Shinohara and K. Shiokawa
• 通讯作者: I. Shinohara and K. Shiokawa