| Revista: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000390701 |
| ISSN: | 0103-9733 |
| Autores: | Oliveira, D.M1 Raeder, J2 Tsurutani, B.T3 Gjerloev, J.W4 |
| Instituciones: | 1National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, Maryland. Estados Unidos de América 2University of New Hampshire, EOS Space Science Center, Durham, New Hampshire. Estados Unidos de América 3California Institute of Technology, Jet Propulsion Laboratory, Pasadena, California. Estados Unidos de América 4Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland. Estados Unidos de América |
| Año: | 2016 |
| Periodo: | Feb |
| Volumen: | 46 |
| Número: | 1 |
| Paginación: | 97-104 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | We derive fast forward interplanetary (IP) shock speeds and impact angles to study the geoeffectiveness of 461 IP shocks that occurred from January 1995 to December 2013 using ACE and Wind spacecraft data. The geomagnetic activity is inferred from the SuperMAG project data. SuperMAG is a large chain which employs more than 300 ground stations to compute enhanced versions of the traditional geomagnetic indices. The SuperMAG auroral electroject SME index, an enhanced version of the traditional AE index, is used as an auroral power (AP) indicator. AP intensity jumps triggered by shock impacts are correlated with both shock speed and impact angle. It is found that high AP intensity events typically occur when high speed IP shocks impact the Earth’s magnetosphere with the shock normal almost parallel to the Sun-Earth line. This result suggests that symmetric and strong magnetospheric compression leads to favorable conditions for intense auroral power release, as shown previously by simulations and observations. Some potential mechanisms will be discussed |
| Disciplinas: | Física y astronomía |
| Palabras clave: | Astronomía, Física espacial, Velocidad de choque, Angulo de impacto, Interacción ionósfera-magnetósfera |
| Keyword: | Physics and astronomy, Astronomy, Space physics, Shock speed, Impact angle, Ionosphere-magnetosphere interaction |
| Texto completo: | Texto completo (Ver PDF) |
