Thumbnail
Access Restriction
Open

Author Zuo, Pingbing ♦ Feng, Xueshang ♦ Wang, Yi ♦ Xie, Yanqiong ♦ Xu, Xiaojun
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ ANNUAL VARIATIONS ♦ IONOSPHERE ♦ MASS ♦ SOLAR CORONA ♦ SOLAR CYCLE ♦ SOLAR WIND ♦ SPACE ♦ SPACE VEHICLES ♦ STELLAR MAGNETOSPHERES ♦ SUN
Abstract Solar wind dynamic pressure pulse (DPP) structures, across which the dynamic pressure changes abruptly over timescales from a few seconds to several minutes, are often observed in the near-Earth space environment. The space weather effects of DPPs on the magnetosphere–ionosphere coupling system have been widely investigated in the last two decades. In this study, we perform a statistical survey on the properties of DPPs near 1 AU based on nearly 20 years of observations from the WIND spacecraft. It is found that only a tiny fraction of DPPs (around 4.2%) can be regarded as interplanetary shocks. For most DPPs, the total pressure (the sum of the thermal pressure and magnetic pressure) remains in equilibrium, but there also exists a small fraction of DPPs that are not pressure-balanced. The overwhelming majority of DPPs are associated with solar wind disturbances, including coronal mass ejection-related flows, corotating interaction regions, as well as complex ejecta. The annual variations of the averaged occurrence rate of DPPs are roughly in phase with the solar activity during solar cycle 23, and during the rising phase of solar cycle 24.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-07-20
Publisher Place United States
Journal Astrophysical Journal
Volume Number 808
Issue Number 1


Open content in new tab

   Open content in new tab