With Yohkoh SXT we got our first good look at motions in the low corona, both at the limb and on the disk. Thanks to this, we are learning a great deal about how CMEs begin.
Yohkoh sees eruptions
Yohkoh discovers X-ray dimming
Yohkoh capitalizes on sigmoids
Yohkoh sees cusps and infers reconnection
Global coronal patterns have hot components
Homing in on global waves and CMEs
Implosions are necessary