Origin and Evolution of Solar Eruptive Phenomena: Observations, Modeling and Sun-Earth Connection

Program WS3    List of Participants for workshop 3



Solar eruptions like flares, CMEs, and jets are transient large scale events expelling plasma and magnetic fields into the heliosphere. Large flares/CMEs propagate from Sun to Earth distance and hence drive plenty of the space weather phenomena. These events occur from magnetically concentrated regions called solar active regions consisting of the groups of sunspots. Active regions store large amounts of magnetic free energy that can be impulsively released during flares and coronal mass ejections. Magnetic energy storage is linked to the existence of twisted magnetic fields known as flux rope. Since the SoHO era of white-light observations, it has been recognized that the magnetic flux rope is the basic building block of the CME structure in the outer solar atmosphere. However, the formation and eruption mechanism of the magnetic flux rope is still elusive and has been a most studied subject of research in the past two decades.

Several space/ground-based observatories assisted with new technology enabled the researchers to acquire the high-resolution and high-cadence observations of the Sun. In particular, the recent uninterrupted high-resolution photospheric vector-field magnetic observations have advanced our understanding of the coronal eruptive features linking to the dynamics of magnetic fields. On the other hand, observations from different vantage points are used to track the propagating disturbance from the Sun into the interplanetary medium whereas in-situ observations are being utilized to study the interaction of the solar magnetic field with the Earth magnetosphere. Altogether, predicting the onset of eruptive flares on the Sun, tracking the CME propagation in the interplanetary medium, and then knowing their geo-effectiveness at the near-earth environment have become ever important in the technology-driven era of human life.

The focus of the workshop would be on recent highlights in the field of solar eruptive phenomena and their space-weather impacts with special emphasis on new observations from space/ground instruments, and advanced numerical simulations. The topics being discussed are also helpful for the science scope of observations to be obtained from the upcoming Indian space science mission ADITYA-L1.

Participation and Tentative Program

Graduate, PhD students, postdoctoral fellows and early-career scientists will be recommended to attend this workshop, however anyone actively working in solar and space physics in India (or Indian overseas scientists) may also participate in this workshop. There are four sessions in this workshop aimed to discuss the topics below

  1. Multi-wavelength observations of eruptive features: jets, prominences, filaments, X-ray sigmoids, EUV hot channels.
  2. Magnetic connections in flares and CMEs: flux rope formation, triggering and driving mechanisms, flare-CME association.
  3. Sun-Earth connection of solar eruptions: propagation, in-situ observations, space-weather effects.
  4. Numerical modeling and MHD simulations: extrapolations, simulations of eruptions and associated physical processes.

Each session will be of 1.5 hours duration. There will be 4 invited talks and 16 contributed/solicited talks.

No. of expected participants: 50

P. Vemareddy (IIA), B. Ravindra (IIA), Abhishek K. Srivastava (IIT BHU), Bhuwan Joshi (USO/PRL),
Ramesh Chandra (Kumaun University), R. A. Maurya (NIT Calicut)