Search Publications
Plasmoids, Flows, and Jets during Magnetic Reconnection in a Failed Solar Eruption
Antiochos, Spiro K.; Kumar, Pankaj; Cho, Kyung-Suk +3 more
We report a detailed analysis of a failed eruption and flare in active region 12018 on 2014 April 3 using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly, IRIS, STEREO, and Hinode/Solar Optical Telescope. At least four jets were observed to emanate from the cusp of this small active region (large brigh…
Observational Evidence of S-web Source of the Slow Solar Wind
Barczynski, K.; Peter, H.; Zhukov, A. N. +25 more
From 2022 March 18 to 21, NOAA Active Region (AR) 12967 was tracked simultaneously by Solar Orbiter at 0.35 au and Hinode/EIS at Earth. During this period, strong blueshifted plasma upflows were observed along a thin, dark corridor of open magnetic field originating at the AR's leading polarity and continuing toward the southern extension of the n…
The First Flight of the Marshall Grazing Incidence X-Ray Spectrometer (MaGIXS)
Reeves, Katharine K.; Del Zanna, Giulio; Golub, Leon +35 more
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) sounding rocket experiment launched on 2021 July 30 from the White Sands Missile Range in New Mexico. MaGIXS is a unique solar observing telescope developed to capture X-ray spectral images of coronal active regions in the 6-24 Å wavelength range. Its novel design takes advantage of recent…
Role of Small-scale Impulsive Events in Heating the X-Ray Bright Points of the Quiet Sun
Del Zanna, Giulio; Bhardwaj, Anil; Mason, Helen E. +6 more
Small-scale impulsive events, known as nanoflares, are thought to be one of the prime candidates that can keep the solar corona hot at its multimillion-Kelvin temperature. Individual nanoflares are difficult to detect with the current generation of instruments; however, their presence can be inferred through indirect techniques such as Differentia…
The Merging of a Coronal Dimming and the Southern Polar Coronal Hole
Long, David M.; Baker, Deborah; Green, Lucie M. +4 more
We report on the merging between the southern polar coronal hole and an adjacent coronal dimming induced by a coronal mass ejection on 2022 March 18, resulting in the merged region persisting for at least 72 hr. We use remote sensing data from multiple co-observing spacecraft to understand the physical processes during this merging event. The evol…
Understanding the Relationship between Solar Coronal Abundances and F10.7 cm Radio Emission
Long, David M.; Brooks, David H.; Baker, Deborah +7 more
Sun-as-a-star coronal plasma composition, derived from full-Sun spectra, and the F10.7 radio flux (2.8 GHz) have been shown to be highly correlated (r = 0.88) during solar cycle 24. However, this correlation becomes nonlinear during increased solar magnetic activity. Here we use cotemporal, high spatial resolution, multiwavelength images of the Su…
Strongest Coronal Magnetic Fields in Solar Cycles 23 and 24: Probing, Statistics, and Implications
Fleishman, Gregory D.; Anfinogentov, Sergey A.; Fedenev, Viktor V.
A strong coronal magnetic field, when present, manifests itself as bright microwave sources at high frequencies produced by the gyroresonant (GR) emission mechanism in thermal coronal plasma. The highest frequency at which this emission is observed is proportional to the absolute value of the strongest coronal magnetic field on the line of sight. …
Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point
Schmieder, Brigitte; Ding, Mingde; Zhu, Jiahao +1 more
Coronal jets are eruptions identified by a collimated, sometimes twisted spire. They are small-scale energetic events compared with flares. Using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly and a magnetogram from Hinode/Spectro-Polarimeter (Hinode/SP), we study the formation and evolution of a jet …
Intriguing Plasma Composition Pattern in a Solar Active Region: A Result of Nonresonant Alfvén Waves?
Stangalini, Marco; Long, David M.; Brooks, David H. +6 more
The plasma composition of the solar corona is different from that of the solar photosphere. Elements that have a low first ionization potential (FIP) are preferentially transported to the corona and therefore show enhanced abundances in the corona compared to the photosphere. The level of enhancement is measured using the FIP bias parameter. In th…
Observations of Magnetic Reconnection and Particle Acceleration Locations in Solar Coronal Jets
Panesar, Navdeep K.; Fleishman, Gregory D.; Musset, Sophie +2 more
We present a multiwavelength analysis of two flare-related jets on 2014 November 13, using data from the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA), the Reuven High Energy Solar Spectroscopic Imager (RHESSI), the Hinode/X-ray Telescope (XRT), and the Interface Region Imaging Spectrograph (IRIS). Unlike most coronal jets, whe…