A HIGH-FREQUENCY TYPE II SOLAR RADIO BURST ASSOCIATED WITH THE 2011 FEBRUARY 13 CORONAL MASS EJECTION

作者：Cho K S^*; Gopalswamy N; Kwon R Y; Kim R S; Yashiro S

来源：Astrophysical Journal, 2013, 765(2): 148.

DOI：10.1088/0004-637X/765/2/148

• shock waves
• Sun: corona
• Sun: coronal mass ejections (CMEs)
• Sun: flares
• Sun: fundamental parameters
• Sun: radio radiation

We examine the relationship between the high-frequency (425 MHz) type II radio burst and the associated white-light coronal mass ejection (CME) that occurred on 2011 February 13. The radio burst had a drift rate of 2.5 MHz s(-1), indicating a relatively high shock speed. From SDO/AIA observations we find that a loop-like erupting front sweeps across high-density coronal loops near the start time of the burst (17:34:17 UT). The deduced distance of shock formation (0.06 Rs) from the flare center and speed of the shock (1100 km s(-1)) using the measured density from SDO/AIA observations are comparable to the height (0.05 Rs, from the solar surface) and speed (700 km s(-1)) of the CME leading edge observed by STEREO/EUVI. We conclude that the type II burst originates even in the low corona (%26lt;59 Mm or 0.08 Rs, above the solar surface) due to the fast CME shock passing through high-density loops.

• 出版日期2013-3-10