Full velocities and propagation directions of coronal mass ejections inferred from simultaneous full-disk imaging and Sun-as-a-star spectroscopic observations
arXiv:2305.08765 · doi:10.3847/1538-4357/acd6a1
Abstract
Coronal mass ejections (CMEs) are violent ejections of magnetized plasma from the Sun, which can trigger geomagnetic storms, endanger satellite operations and destroy electrical infrastructures on the Earth. After systematically searching Sun-as-a-star spectra observed by the Extreme-ultraviolet Variability Experiment (EVE) onboard the Solar Dynamics Observatory (SDO) from May 2010 to May 2022, we identified eight CMEs associated with flares and filament eruptions by analyzing the blue-wing asymmetry of the O III 52.58 nm line profiles. Combined with images simultaneously taken by the 30.4 nm channel of the Atmospheric Imaging Assembly onboard SDO, the full velocity and propagation direction for each of the eight CMEs are derived. We find a strong correlation between geomagnetic indices (Kp and Dst) and the angle between the CME propagation direction and the Sun-Earth line, suggesting that Sun-as-a-star spectroscopic observations at EUV wavelengths can potentially help to improve the prediction accuracy of the geoeffectiveness of CMEs. Moreover, an analysis of synthesized long-exposure Sun-as-a-star spectra implies that it is possible to detect CMEs from other stars through blue-wing asymmetries or blueshifts of spectral lines.
arXiv commentAccepted by ApJ
References in corpus (24)
- CHIANTI - an atomic database for emission lines - Paper XV: Version 9, improvements for the X-ray satellite lines
- Velocity Characteristics of Evaporated Plasma Using Hinode/EIS
- Connecting speeds, directions and arrival times of 22 coronal mass ejections from the Sun to 1 AU
- Probable detection of an eruptive filament from a superflare on a solar-type star
- Temporal evolution of chromospheric evaporation: case studies of the M1.1 flare on 2014 September 6 and X1.6 flare on 2014 September 10
- Imaging and spectroscopic observations of magnetic reconnection and chromospheric evaporation in a solar flare
- What can we learn about solar coronal mass ejections, coronal dimmings, and Extreme-Ultraviolet jets through spectroscopic observations?
- Observational Evidence for Gentle Chromospheric Evaporation During the Impulsive Phase of a Solar Flare
- Two components of the coronal emission revealed by EUV spectroscopic observations
- A stellar flare-coronal mass ejection event revealed by X-ray plasma motions
- The quest for stellar coronal mass ejections in late-type stars: I. Investigating Balmer-line asymmetries of single stars in Virtual Observatory data
- Quantitative Comparison of Methods for Predicting the Arrival of Coronal Mass Ejections at Earth based on multi-view imaging
- A STEREO Survey of Magnetic Cloud Coronal Mass Ejections Observed at Earth in 2008--2012
- ElEvoHI: a novel CME prediction tool for heliospheric imaging combining an elliptical front with drag-based model fitting
- Morphological evolution of a 3D CME cloud reconstructed from three viewpoints
- Sun-as-a-star spectroscopic observations of the line-of-sight velocity of a solar eruption on October 28, 2021
- Blue wing enhancement of the chromospheric Mg II h and k lines in a solar flare
- Different Patterns of Chromospheric Evaporation in a Flaring Region Observed with Hinode/EIS
- Detection of Flare-induced Plasma Flows in the Corona of EV Lac with X-ray Spectroscopy
- Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra
- UVCS/SoHO Catalog of Coronal Mass Ejections from 1996 to 2005: Spectroscopic Proprieties
- The Slowly Varying Corona: I --- Daily Differential Emission Measure Distributions Derived from EVE Spectra
- Observations of solar flares with IRIS and SDO
- Three-dimensional analyses of an aspherical coronal mass ejection and its driven shock