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  1. F300 宇宙地球環境研究所
  2. F300a 雑誌掲載論文
  3. 学術雑誌

Coronal Density Measurements Using Giant Radio Pulses of the Crab Pulsar at the Cycle 24/25 Minimum

http://hdl.handle.net/2237/0002001978
http://hdl.handle.net/2237/0002001978
1108b4f6-5c1f-45c7-8cb7-2a636a49726e
名前 / ファイル ライセンス アクション
Tokumaru2022_Article_CoronalDensityMeasurementsUsin.pdf Tokumaru2022_Article_CoronalDensityMeasurementsUsin.pdf (2 MB)
Item type itemtype_ver1(1)
公開日 2022-01-20
タイトル
タイトル Coronal Density Measurements Using Giant Radio Pulses of the Crab Pulsar at the Cycle 24/25 Minimum
言語 en
著者 Tokumaru, Munetoshi

× Tokumaru, Munetoshi

en Tokumaru, Munetoshi

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Maeda, Ryuya

× Maeda, Ryuya

en Maeda, Ryuya

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Tawara, Kaito

× Tawara, Kaito

en Tawara, Kaito

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Takefuji, Kazuhiro

× Takefuji, Kazuhiro

en Takefuji, Kazuhiro

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Terasawa, Toshio

× Terasawa, Toshio

en Terasawa, Toshio

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 This article is licensed under a Creative Commons Attribution 4.0 International License
内容記述
内容記述 Accurate measurements of the coronal plasma density profile, which varies with the solar cycle (SC), are necessary to elucidate the solar wind acceleration. In this study, the Crab pulsar is observed using the 327 MHz radio telescope at the Toyokawa Observatory of the Institute for Space-Earth Environmental Research of Nagoya University to investigate the coronal plasma density profile for radial distances between 5 and 60 solar radii at the SC24/25 minimum. We derive the dispersion measures (DMs) that represent the integration of plasma density along the line of sight (LOS) for giant radio pulses of the Crab pulsar. We find that the observed DMs increased above the interstellar background level when the LOS for the Crab pulsar approached the Sun in mid-June 2018 and 2019. This increase in DM is attributed to the effect of the coronal plasma. We determine the plasma density distribution by fitting a spherically symmetric model to the observed DM data. The flat radial slopes of the best-fit model are consistent with pulsar observations in the low-activity periods of past SCs, and they are attributed to the effect of the coronal hole over the south pole of the Sun. Our results show that the density level near the Sun is similar to those observed in the low activity periods of past SCs, implying recovery of the coronal plasma density from a significant reduction at the SC23/24 minimum.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 Springer
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ AM
出版タイプResource http://purl.org/coar/version/c_ab4af688f83e57aa
関連情報
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1007/s11207-021-01939-6
収録物識別子
収録物識別子タイプ PISSN
収録物識別子 0038-0938
書誌情報 en : Solar Physics

巻 297, 号 1, p. 10, 発行日 2022-01-17
ファイル公開日
日付 2022-01-20
日付タイプ Available
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