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Observations of an extreme storm in interplanetary space caused by successive coronal mass ejections
Kajdič, Primož; Lavraud, Benoit; Nitta, Nariaki V. +8 more
Space weather refers to dynamic conditions on the Sun and in the space environment of the Earth, which are often driven by solar eruptions and their subsequent interplanetary disturbances. It has been unclear how an extreme space weather storm forms and how severe it can be. Here we report and investigate an extreme event with multi-point remote-s…
Discovery of X-ray pulsations from a massive star
Huenemoerder, David P.; Ignace, Richard; Hamann, Wolf-Rainer +4 more
X-ray emission from stars much more massive than the Sun was discovered only 35 years ago. Such stars drive fast stellar winds where shocks can develop, and it is commonly assumed that the X-rays emerge from the shock-heated plasma. Many massive stars additionally pulsate. However, hitherto it was neither theoretically predicted nor observed that …