IHV: a new long-term geomagnetic index

被引：79

作者：

Svalgaard, L

Cliver, EW

Le Sager, P

机构：

[1] Easy Toolkit Inc, Houston, TX 77055 USA

[2] USAF, Res Lab, Space Vehicles Directorate, Hanscom AFB, MA 01731 USA

[3] Prairie View A&M Univ, Solar Observ, Prairie View, TX 77446 USA

来源：

SOLAR VARIABILITY AND CLIMATE CHANGE | 2004年 / 34卷 / 02期

关键词：

geomagnetic index; inter-hour variability index; aa index;

D O I：

10.1016/j.asr.2003.01.029

中图分类号：

V [航空、航天];

学科分类号：

08 [工学]; 0825 [航空宇航科学与技术];

摘要：

We derive a new daily index of geomagnetic activity, the Inter-Hour Variability index (IHV), for investigations of the long-term variability of the solar wind-magnetosphere system. The IHV index is used to successfully reconstruct yearly-averages of the range indices am, ap, and aa from 1959 through 2000. When we attempt to reconstruct the aa index back to 1901, however, the reconstructed aa lies above the observed aa for years before 1957, with the difference between the two curves being the greatest (similar to5-10 nT) during the first two decades of the 20th century. (C) 2004 COSPAR. Published by Elsevier Ltd. All rights reserved.

引用

页码：436 / 439

页数：4