Title: The Sun-Earth Connection Event during July 14-16, 2000: from the
Sun to the Earth
Author: D. J. Wu
Affil: Purple Mountain Observatory, Chinese Academy of Sciences
2 West Bejing Road, Nanjing, 210008, P. R. China
ABSTRACT: During the interval July 14-16, 2000, the relative solar-terrestrial satellites and groud facilities tracked a Coronal Mass Ejection (CME) from the Sun to the Earth. The CME took only about 30 hours to travel through interplanetary space before arriving at the Earth, where it caused strong geomagnetic storms and aurorae. This event is very interesting because of its strong magnetic field and high velocity when arrived at the Earth. The CME was first visible in SOHO/LASCO/C2 at 10:54 UT on July 14. The estimated initial speed was problably higher than 1700 km/s. The resulting Interplanetary Magnetic Cloud (IMC) and the interplanetary shock driven by the CME arrived at the magnetosphere, respectively, at about 19:30 UT and 14:30 UT on July 15. The velocity on the front of the IMC was as high as 1000 km/s, and the interplanetary magnetic field and its southward component jumped to unusual 60 nT and 50 nT, respectively, which were stronger than the magnetic field in the magnetosheath (around 40 nT), when the IMC arrived. Its effects lasted over 20 hours, and causd strong geoeffectiveness. During its passage the K_p index at a value of 9 for over 9 hours, and the Dst index minima was close to -300 nT. Here we present an overview of the event and available observations.