Coronal mass ejections (CMEs) are powerful expulsions of gigantic clouds of magnetized plasma that routinely erupt from the Sun and propagate out through the solar system. When such an eruption is directed toward the Earth with high speed and has a southward component (Bz) of the magnetic field, an intense geomagnetic storm occurs upon the impact of the CME on Earth's magnetosphere. Therefore, understanding the evolution and propagation of CMEs and their space weather impacts are of utmost importance.
We propose a one -day workshop on “CME propagation in the interplanetary space to predict Bz and space weather impact”. The proposed ASI workshop will address one of the most compelling problems in solar and solar-terrestrial physics: the identification of the source of the out-of-the-ecliptic component (Bz) of the magnetic field in coronal mass ejections (CMEs) that is responsible for severe geomagnetic storms. This requires the state-of the-art observations, modelling, and data analysis in order to understand the physical processes which control the magnitude and direction of the CME flux rope that ultimately determine the strength of resulting geomagnetic storms. The main science question is to address, how the magnetic field vectors of the CME at the Sun and at 1 AU are related so that a reliable forecasting scheme can be established to predict these vectors at any point in the heliosphere.
The proposed workshop aims to discuss the recent advancements made in our understanding of the physical parameters associated with CMEs near the Sun and immediately outside Earth’s magnetosphere, thus providing critical inputs for broader space weather research.
The outcome of the research undertaken in an ongoing Indo-US Science and Technology Forum (IUSSTF) network center project on the same topic, will be shared in the scientific sessions of the workshop. The workshop is timely with the successful launch of Aditya-L1 recently. The workshop is also aimed in engaging in discussion and planning on CME modeling and its effect on heliosphere using CME observations from VELC and insitu payloads like ASPEX, MAG and PAPA.
Participation and tentative programme:
We invite participation from researchers working in the area of solar and heliospheric physics. There will be four sessions in the workshop.
(1) CME initiation and its characteristic evolution in the low corona
(2) Influence of background solar wind on the interplanetary evolution of CMEs
(3) Space weather forecasting capabilities to predict Bz
(4) Understanding the ICME dynamics from L1 point
Each session will be of 1.5 hours duration. There will be few oral and solicited talks and others will be contributory presentations
No. of expected Participants: between 50-100
Nandita Srivastava (USO/PRL, Udaipur), Piyali Chatterjee (IIA, Bangalore) and Prasad Subramanian (IISER, Pune), and Nat Gopalswamy (NASA/GSFC)
Nat Gopalswamy, Ranadeep Sarkar, Dibyendu Nandi, Talwinder Singh, Wageesh Mishra, Dibyendu Chakrabarty, Bhargav Vaidya, Sandeep Kumar, Piyali Chatterjee, Debesh Bhattacharjee, G. Sindhuja, Anshu Kumari, Aveek Sarkar, Ramit Bhattacharyya.