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2D solar wind speeds from 6 to 26 solar radii in solar cycle 24 by using Fourier filtering View all abstracts by submitter

Il-Hyun Cho   Submitted: 2018-06-24 19:10

Measurement of the solar wind speed near the Sun is important for understanding the acceleration mechanism of the solar wind. In this study, we determine 2D solar wind speeds from 6 to 26 solar radii by applying Fourier motion filters to SOHO/LASCO C3 movies observed from 1999 to 2010. Our method successfully reproduces the original flow speeds in the artificially generated data as well as streamer blobs. We measure 2D solar wind speeds from 1-day to 1-year timescales and their variation in solar cycle 24. We find that the solar wind speeds at timescales longer than a month in the solar maximum period are relatively uniform in the azimuthal direction, while they are clearly bimodal in the minimum period, as expected from the Ulysses observations and IPS reconstruction. The bimodal structure appears at around 2006, becomes most distinctive in 2009, and abruptly disappears in 2010. The radial evolution of the solar wind speeds resembles the Parker's solar wind solution.

Authors: Il-Hyun Cho, Yong-Jae Moon, Valery M. Nakariakov, Su-Chan Bong, Jin-Yi Lee, Donguk Song, Harim Lee, and Kyung-Suk Cho
Projects: SoHO-LASCO

Publication Status: accepted by PRL
Last Modified: 2018-06-25 09:30
Go to main E-Print page  Efficient Calculation of Non-Local Thermodynamic Equilibrium Effects in Multithreaded Hydrodynamic Simulations of Solar Flares  Non-damping oscillations at flaring loops  Edit Entry  Download Preprint  Delete Entry 

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