2:45 PM - 3:00 PM
[PEM16-05] Using interplanetary scintillation observations for background solar wind speed in SUSANOO-CME
Keywords:Solar wind, MHD simulation, Space weather forecast, Interplanetary scintillation (IPS), coronal mass ejections (CMEs)
Coronal mass ejections (CMEs) are one of the causes of interplanetary space disturbances, and predicting the arrival of CMEs to the Earth is an important issue for space weather forecasting, for which global magnetohydrodynamic (MHD) simulations have been studied. Since CMEs are significantly affected by interactions with the surrounding solar wind, reproducing the solar wind is an important research topic.
In the global MHD simulation, for example SUSANOO-CME taht is used in the space weather forecasting, several parameters of the background solar wind are derived from the an empirical solar wind model based on the synoptic magnetogram. However, uncertainties in the empirical model. One of them can be replaced by the solar wind velocity data in interplanetary space from the Interplanetary Space Scintillation (IPS) observations at the Institute for Space and Earth Environment (ISEE), Nagoya University. IPS is a radio wave scattering phenomena caused by the solar wind.
Since the development of the next generation IPS observation instruments, that will observe IPS throughout the year, is currently underway, space weather forecasting is expected to be greatly improved through simulations using the IPS data.
In this study, with the aim of improving the accuracy of the heliospheric MHD simulation by reproducing the background solar wind, the solar wind velocity derived by the ISEE IPS observations was used as a boundary condition for SUSANOO-CME. To verify the background solar wind, we used the periods September 13-29, 2003 and August 14-30, 2007, when the influence of CMEs was small. As a result, no clear improvement in accuracy was observed in this study. Modifications to the tomographic processing of IPS data may be effective in improving accuracy.
In the global MHD simulation, for example SUSANOO-CME taht is used in the space weather forecasting, several parameters of the background solar wind are derived from the an empirical solar wind model based on the synoptic magnetogram. However, uncertainties in the empirical model. One of them can be replaced by the solar wind velocity data in interplanetary space from the Interplanetary Space Scintillation (IPS) observations at the Institute for Space and Earth Environment (ISEE), Nagoya University. IPS is a radio wave scattering phenomena caused by the solar wind.
Since the development of the next generation IPS observation instruments, that will observe IPS throughout the year, is currently underway, space weather forecasting is expected to be greatly improved through simulations using the IPS data.
In this study, with the aim of improving the accuracy of the heliospheric MHD simulation by reproducing the background solar wind, the solar wind velocity derived by the ISEE IPS observations was used as a boundary condition for SUSANOO-CME. To verify the background solar wind, we used the periods September 13-29, 2003 and August 14-30, 2007, when the influence of CMEs was small. As a result, no clear improvement in accuracy was observed in this study. Modifications to the tomographic processing of IPS data may be effective in improving accuracy.