Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh13b1983l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH13B-1983
Astronomy and Astrophysics
Astrophysics
[7599] Solar Physics, Astrophysics, And Astronomy / General Or Miscellaneous
Scientific paper
The NASA Solar Terrestrial Relations Observatory (STEREO) mission placed two spacecraft into nearly circular solar orbits, in the ecliptic plane, and with radii near 1 astronomical unit (AU). One spacecraft leads and the other lags, the earth's own 1 AU orbital path and both separates from earth at an average rate of 22°/year during the past 5 years. Together with the ACE spacecraft at the L1 point, they provide a good opportunity to study the evolution of CIRs in several days period. Currently, solar wind observations on ACE are the direct basis for Earth space environment forecasting. In the present study, we collect and analyze the CIRs from 2007 to 2009. We find that the correlation coefficient of CIR speed on STEREO-behind and ACE was high (R=0.84). The solar wind temperature didn't change much too, while the difference of solar wind density and magnetic field for STEREO-behind and ACE were large. The difference increased as the separation angle of the STEREO and ACE spacecrafts increasing. Under the assumption that solar wind travels radially and the coronal holes rotate rigidly on the solar disk, CIR arrival time on ACE can be predicted by CIR observations on STEREO-behind. The average and maximum error of travel times was 0.217 day and 0.952 day, respectively. The errors of the predicted arrival time increased with separation angle. Based on these result, the CIR observations on the STEREO-behind could be used as reference of CIR characteristics on the ACE, and provided basis for forecasting of Earth space environment disturbance.
Gong Jingyu
Liu Shujuan
Luo Baorong
Wang Jeffrey
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