Shrinking equatorial plasma bubbles

DOI Web Site Web Site 参考文献63件 オープンアクセス
  • V. L. Narayanan
    Indian Institute of Science Education and Research Mohali Mohali India
  • S. Gurubaran
    Indian Institute of Geomagnetism Mumbai India
  • K. Shiokawa
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • K. Emperumal
    Equatorial Geophysical Research Laboratory Indian Institute of Geomagnetism Tirunelveli India

書誌事項

公開日
2016-07
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016ja022633
公開者
American Geophysical Union (AGU)

この論文をさがす

説明

<jats:title>Abstract</jats:title><jats:p>The formation of equatorial plasma bubbles (EPBs) associated with spread <jats:italic>F</jats:italic> irregularities are fairly common phenomenon in the postsunset equatorial ionosphere. These bubbles grow as a result of eastward polarization electric field resulting in upward <jats:italic>E</jats:italic> × <jats:italic>B</jats:italic> drift over the dip equator. As they grow they are also mapped to low latitudes along magnetic field lines. The EPBs are often observed as airglow depletions in the images of OI 630 nm emission. On occasions the growth of the features over the dip equator is observed as poleward extensions of the depletions in all‐sky images obtained from low latitudes. Herein, we present interesting observations of decrease in the latitudinal extent of the EPBs corresponding to a reduction in their apex altitudes over the dip equator. Such observations indicate that these bubbles not only grow but also shrink on occasions. These are the first observations of shrinking EPBs. The observations discussed in this work are based on all‐sky airglow imaging observations of OI 630.0 nm emission made from Panhala (11.1°N dip latitude). In addition, ionosonde observations made from dip equatorial site Tirunelveli (1.1°N dip latitude) are used to understand the phenomenon better. The analysis indicates that the speed of shrinking occurring in the topside is different from the bottomside vertical drifts. When the EPBs shrink, they might decay before sunrise hours.</jats:p>

収録刊行物

参考文献 (63)*注記

もっと見る

関連プロジェクト

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ