A surge obsrved in Hα and CIV |
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Authors: | B Schmieder P Mein JC Vial E Tandberg-Hanssen |
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Institution: | Observatoire de Paris, Meudon, France;L.P.S.P. 91370 Verrières, France;Marshall Space Flight Center, Alabama 35812, USA |
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Abstract: | Simultaneous Hα (MSDP at Meudon) and C IV (UVSP aboard SMM) measurements of Active Region 2701 were made on October 2, 1980. Isodensity and velocity maps were derived for both lines and superposed. A good correlation was found between Hα and C IV velocities. A surge was observed for 10 minutes. The base was located in a bright point in CIV and Hα, and escaping matter followed the same channel (“absorbing” in Hα, “emitting” in C IV). The velocity along the surge was about 80 kms.-1 in Hα and 100 km s-1 in C IV. A loop appeared in C IV. We discuss the existing models and conclude that the vertical pressure gradient was capable of driving the surge. |
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