2001 Fiscal Year Final Research Report Summary
S-RAMP Project : Geomagnetic Storms
| Project/Area Number |
12640432
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Space and upper atmospheric physics
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
KAMIDE Yohsuke Nagoya University, Solar-Terrestrial Environment Laboratory, Professor, 太陽地球環境研究所, 教授 (60113099)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MASUDA Satoshi Nagoya University, Solar-Terrestrial Environment Laboratory, Research Associaton, 太陽地球環境研究所, 助手 (10262916)
SHINAGAWA Hiroyuki Nagoya University, Solar-Terrestrial Environment Laboratory, Associate Professor, 太陽地球環境研究所, 助教授 (00262915)
OGINO Tasuki Nagoya University, Solar-Terrestrial Environment Laboratory, Professor, 太陽地球環境研究所, 教授 (00109274)
KOJIMA Masayoshi Nagoya University, Solar-Terrestrial Environment Laboratory,Professor, 太陽地球環境研究所, 教授 (70023687)
NISHITANI Nozomu Nagoya University, Solar-Terrestrial Environment Laboratory, Research Association, 太陽地球環境研究所, 助手 (10218159)
|
|---|
| Project Period (FY) |
2000 – 2001
|
| Keywords | Solar wind / Magnetosphere / Geomagnetic storm / Substorm / Ring current / Geomagnetic variation / Geomagnetic index / Ionosphere |
|---|
| Research Abstract |
Under the international S-RAMP project of SCOSTEP, this research proposal intended to obtain basic knowledge of electromagnetic and plasma dynamics toward solar-terrestrial predictions. Practically, we aimed at establishing an empiricalrelationship between variations in the solar wind and geomagnetic storms/substorms, and at a numerical scheme for predicting these phenomena. The following are the main points of what were conducted and obtained :
1. Two practical methods were developed to predict the occurrence of geomagnetic storms and substorms, both using real-time measurements of the solar wind and the interplanetary magnetic field. One is based on an empirical formula of estimating the Dst index, expressing the intensity of the ring current in the magnetosphere, and the other is to run an MHD simulation model of solar wind-magnetosphere coupling. Both turned out to be practically successful.
2. As a long-term prediction of geomagnetic activity, semi-annual variations of the aa index
… More
were studied. It was found that the Russell-McPherron effect, which claimed the importance of the effective southward component in solar-magnetospheric coordinates, serves only 20% of the semi-annual variations.
3. Nowcasting (or specifying) the electrostatic potential in the ionosphere by using real-time observations of the earth's magnetic perturbations has been established. Since it is unavoidable to face the non-uniform distributions of magnetic observatories, a combination of both the KRM and AMIE algorithms was employed. AMIE, along with an empirical model for the electric potential, was used first for estimating the global distribution of the potential, which was then used as the boundary condition of detailed calculations of the potential in a localized region in which real-tme data from a dense network of observatories are available. Data are being obtained through the efforts of NOAA/NGDC.
4. It is planned that basic algorithms obtained in this research project will be used in practice at the Communications Research Laboratory to forecast some of the most intense geomagnetic storms. Less
|
Research Products
(12 results)
