Effects of solar activity on ionospheric current system in the Southeast Asia region
| Autor: | Akimasa Yoshikawa, Wan Nur Izzaty Ismail, Nurul Shazana Abdul Hamid, N. I. M. Rosli |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Geomagnetic storm General Physics and Astronomy Equatorial electrojet Solar cycle 24 Atmospheric sciences 01 natural sciences Physics::Geophysics Latitude Southeast asia Current (stream) Earth's magnetic field Physics::Space Physics 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Ionosphere Physics::Atmospheric and Oceanic Physics Geology |
| Zdroj: | Indian Journal of Physics. 95:543-550 |
| ISSN: | 0974-9845 0973-1458 |
| DOI: | 10.1007/s12648-020-01734-2 |
| Popis: | The equatorial ionospheric current system is composed of equatorial electrojet (EEJ) and solar quiet (Sq) that flow in the eastward direction. That being mentioned, this study looked into the changes in ionospheric currents stemming from geomagnetic storm disturbances at different levels of solar activity during solar cycle 24. This analysis was performed by employing an EEJ index known as EUEL, which is calculated from northward geomagnetic component data measured using ground-based magnetometer at five different latitudes across the Southeast Asia region. Based on the outcomes, the impacts of geomagnetic storm on EEJ currents were observed at 1200 LT and 1100 LT, respectively, during high and low solar activity levels. Time delay was associated with changes in EEJ peak time at varied activity levels. This case study reveals that EEJ value at peak time of high solar activity decreased significantly during the main phase of geomagnetic storm. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink