Comparison between cool and hot plasma behaviors of surges

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Cold Plasmas, Cooling Flows (Astrophysics), High Temperature Plasmas, Solar Corona, Sun, Surges, Chromosphere, Magnetic Fields, Sky Surveys (Astronomy), Space Observations (From Earth), Spectrographs

Scientific paper

Ground-based coordinated observations with the Multichannel Subtractive Double Pass spectrograph (MSDP) allowed us to obtain chromospheric intensity and velocity field maps below coronal structures during the launch of the NIXT payload on 1991 July 11 (eclipse day). A large H-alpha ejection in AR 6713 (N38 W40) was detected during the NIXT flight. However, only a low level of X-ray emission was associated with this event. In contrast, bright X-ray emission associated with a subflare was observed in a nearby active region, but with only a weak associated ejection in H-alpha. A discussion of both of these events gives strong constraints on the triggering mechanisms of surges.

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