Abstract
A large coronal mass ejection (CME) was occurred on July 10, 2005 08:54 UT at the South‐West solar limb. This was a partial type of CME as the ejected coronal plasma covered partially around the occulting disk of coronagraph. The Large Angle and Spectrometric Coronagraph (LASCO) aboard Solar and Heliospheric Observatory (SOHO) data were used in detecting CME. The data taken by the Extreme‐ultraviolet Imaging Telescope (EIT) as well as Michelson Doppler Imager (MDI) that observes the active regions in white‐light wavelength and maps the magnetic field of the photosphere are used to identify the source region of CME. The projected speed of CME perpendicular the Sun‐Earth line is determined to estimate the arrival time at the Earth’s orbit. The speed and location of the source region of CME are used to study the effect of CME to the Earth’s magnetosphere (geo‐effectiveness). It is concluded that the CME’s effect to the Earth’s space environment was relatively small (Dst index greater than –100 nT) due to the source region was located close to the West solar limb. This work supports the efforts in establishing space weather service at LAPAN.
Keywords: coronal mass ejection, geo‐effectiveness, space environment, space weather
