Search Publications
High-accuracy polarization measurements of the white-light corona during the 2023 total solar eclipse
Hanaoka, Yoichiro; Sakai, Yoshiaki; Masuda, Yukio
This study measured the polarization of the white-light corona during the total solar eclipse on 20 April 2023, which occurred under high solar activity. The same instrument that was used for the 2017 and 2019 eclipse observations was employed, and despite the short duration of totality, the obtained data could be used for high-accuracy polarizati…
Evidence of Kelvin-Helmholtz and tearing mode instabilities at the magnetopause during space weather events
Jerse, Giovanna; Marcucci, Maria Federica; Laurenza, Monica +9 more
Introduction: Kelvin-Helmholtz (KH) and tearing mode (TM) instabilities are one of the most important mechanisms of solar wind energy, momentum and plasma transport within the magnetosphere.Methods: To investigate the conditions under which KHTM instabilities occur in the Earth environment it is fundamental to combine simultaneous multipoint in si…
Statistical geoeffectiveness of solar-interplanetary disturbance events of type II radio bursts and CMEs/shocks
Yan, Jingye; Yu, Quanyingqi
Understanding and predicting the geoeffectiveness of solar activity on Earth is crucial for space weather. Therefore, predicting the impact of coronal mass ejections (CMEs) and their associated interplanetary (IP) shocks on Earth is essential. Observations of CMEs near the Sun can be used for these prediction and to study their propagation and evo…
The evolution of our understanding of coronal mass ejections
Vourlidas, Angelos; Stenborg, Guillermo; Howard, Russell A.
The unexpected observation of a sudden expulsion of mass through the solar corona in 1971 opened up a new field of interest in solar and stellar physics. The discovery came from a white-light coronagraph, which creates an artificial eclipse of the Sun, enabling the viewing of the faint glow from the corona. This observation was followed by many mo…
Exploring the impact of imaging cadence on inferring CME kinematics
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +2 more
The kinematics of coronal mass ejections (CMEs) are crucial for understanding their initiation mechanism and predicting their impact on Earth and other planets. With most of the acceleration and deceleration occurring below 4 R⊙, capturing this phase is vital to better understand their initiation mechanism. Furthermore, the kinematics of CMEs in t…
SITCoM: SiRGraF Integrated Tool for Coronal dynaMics
Patel, Ritesh; Udhwani, Purvi; Shrivastav, Arpit Kumar
SiRGraF Integrated Tool for Coronal dynaMics (SITCoM) is based on the Simple Radial Gradient Filter used to filter the radial gradient in the white-light coronagraph images and bring out dynamic structures. SITCoM has been developed in Python and integrated with SunPy and can be installed by users with the command pip install sitcom. This enables …
The Planetary Theory of Solar Activity Variability: A Review
Scafetta, Nicola; Bianchini, Antonio
Commenting the 11-year sunspot cycle, Wolf (1859, MNRAS 19, 85–86) conjectured that "the variations of spot-frequency depend on the influences of Venus, Earth, Jupiter, and Saturn." The high synchronization of our planetary system is already nicely revealed by the fact that the ratios of the planetary orbital radii are closely related to each othe…
Solar Jets: SDO and IRIS Observations in the Perspective of New MHD Simulations
Schmieder, Brigitte
Solar jets are observed as collimated plasma beams over a large range of temperatures and wavelengths. They have been observed in H α and optical lines for more than 50 years and called surges. The term "jet" comes from X-ray observations after the launch of the Yohkoh satellite in 1991. They are the means of transporting energy through the helios…
Eruption and Interplanetary Evolution of a Stealthy Streamer-Blowout CME Observed by PSP at ∼0.5 AU
Lynch, Benjamin J.; Palmerio, Erika; Stevens, Michael L. +5 more
Streamer-blowout coronal mass ejections (SBO-CMEs) are the dominant CME population during solar minimum. Although they are typically slow and lack clear low-coronal signatures, they can cause geomagnetic storms. With the aid of extrapolated coronal fields and remote observations of the off-limb low corona, we study the initiation of an SBO-CME pre…
Predicting CME arrival time through data integration and ensemble learning
Xu, Yan; Jing, Ju; Wang, Haimin +7 more
The Sun constantly releases radiation and plasma into the heliosphere. Sporadically, the Sun launches solar eruptions such as flares and coronal mass ejections (CMEs). CMEs carry away a huge amount of mass and magnetic flux with them. An Earth-directed CME can cause serious consequences to the human system. It can destroy power grids/pipelines, sa…