@article{8d2b400f9a2e4242bfe1c09b7e2c5115,
title = "Spatial Distribution of Fine-Structured and Unstructured EMIC Waves Observed by the Arase Satellite",
abstract = "We surveyed 378 electromagnetic ion cyclotron (EMIC) wave events using Arase during the first 12 months. We discriminated the observed EMIC waves into two types (fine-structured EMIC waves and unstructured EMIC waves), according to whether or not they exhibited clear periodic amplitude modulations. We found a clear afternoon peak in the occurrence probability of unstructured EMIC waves in the region of L = 5–9. Fine-structured EMIC waves were mainly distributed in the off-equatorial region, and their occurrence probability was clearly high around the noon sector. Such noon sector EMIC wave peaks had not been found in the THEMIS, AMPTE, or Cluster measurements, due to their limited L shell coverages. The Van Allen probes, too, were not able to measure the major region of fine-structured EMIC waves because of their limited latitudinal coverage. Our unique statistical results demonstrate the importance of discriminating the wave structures as well as of performing observations over a wide range of latitudes.",
keywords = "Arase satellite, EMIC wave, inner magnetosphere, spatial distribution",
author = "S. Matsuda and Y. Kasahara and Y. Miyoshi and R. Nomura and M. Shoji and A. Matsuoka and Y. Kasaba and S. Kurita and M. Teramoto and K. Ishisaka",
note = "Funding Information: Science data of the ERG (Arase) satellite were obtained from the ERG Science Center operated by ISAS/JAXA and ISEE/Nagoya University (https://ergsc.isee.nagoya-u.ac.jp/ index.shtml.en). The Arase satellite data will be publicly available via ERG Science Center on a project-agreed schedule. In the present study, we use level 1-prime EFD ver. 7 data, and level 2 MGF ver. 002 data. Part of this work was done at the ERG-Science Center operated by ISAS/JAXA and ISEE/Nagoya University. This study was supported by Grants-in-Aid for Scientific Research (14J02108, 16J02163, 17K05668, 15H05815, 15H05747, 16H06286, 16H04056, and 17K14402) of the Ministry of Education, Culture, Sports, Science, and Technology in Japan. This study was supported by JSPS Bilateral Open Partnership Joint Research Projects. Funding Information: Science data of the ERG (Arase) satellite were obtained from the ERG Science Center operated by ISAS/JAXA and ISEE/Nagoya University (https://ergsc.isee.nagoya-u.ac.jp/index.shtml.en). The Arase satellite data will be publicly available via ERG Science Center on a project-agreed schedule. In the present study, we use level 1-prime EFD ver. 7 data, and level 2 MGF ver. 002 data. Part of this work was done at the ERG-Science Center operated by ISAS/JAXA and ISEE/Nagoya University. This study was supported by Grants-in-Aid for Scientific Research (14J02108, 16J02163, 17K05668, 15H05815, 15H05747, 16H06286, 16H04056, and 17K14402) of the Ministry of Education, Culture, Sports, Science, and Technology in Japan. This study was supported by JSPS Bilateral Open Partnership Joint Research Projects. Publisher Copyright: {\textcopyright}2018. American Geophysical Union. All Rights Reserved.",
year = "2018",
month = nov,
day = "16",
doi = "10.1029/2018GL080109",
language = "English",
volume = "45",
pages = "11,530--11,538",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "21",
}