Search Publications
Solar Orbiter Observations of Proton and Alpha Particle Kinetic Signatures Related to the Presence of Switchbacks in the Inner Heliosphere: A Case Study
Telloni, Daniele; D'Amicis, Raffaella; Perrone, Denise +6 more
We investigate how ions, namely protons and alpha particles, kinetically react to the presence of strong deflections in the magnetic field, the so-called switchbacks, in the first stream of slow Alfvénic wind observed by Solar Orbiter at the heliocentric distance of 0.64 au. We focus on an isolated, large-scale switchback, and we study in detail i…
Source Region and Launch Characteristics of Magnetic-arch-blowout Solar Coronal Mass Ejections Driven by Homologous Compact-flare Blowout Jets
Joshi, Bhuwan; Moore, Ronald L.; Sterling, Alphonse C. +1 more
We study the formation of four coronal mass ejections (CMEs) originating from homologous blowout jets. All of the blowout jets originated from NOAA Active Region (AR) 11515 on 2012 July 2, within a time interval of ≈14 hr. All of the CMEs were wide (angular widths ≈ 95°–150°), and propagated with speeds ranging between ≈300 and 500 km s‑1
Statistics of Solar White-light Flares. I. Optimization and Application of Identification Methods
Hou, Yijun; Li, Ting; Liu, Jifeng +1 more
White-light flares (WLFs) are energetic activity in the stellar atmosphere. However, observed solar WLFs are relatively rare compared to stellar WLFs or solar flares observed at other wavelengths, which limits our further understanding of solar/stellar WLFs through statistical studies. By analyzing flare observations from the Solar Dynamics Observ…
XMM-Newton Perspective of the Unique Magnetic Binary-ϵ Lupi
Wade, Gregg A.; Biswas, Ayan; Chandra, Poonam +3 more
The ϵ Lupi A (HD 136504) system stands out among magnetic massive binaries as the only short-period binary system in which both components have detectable magnetic fields. The proximity of the magnetospheres of the components leads to magnetospheric interactions, which are revealed as periodic pulses in the radio light curve of this system. In thi…
Transition Region Brightening in a Moss Region and Their Relation with Lower Atmospheric Dynamics
Joshi, Jayant; Chen, Yajie; Yurchyshyn, Vasyl +5 more
Small-scale brightenings (SBs) are commonly observed in the transition region (TR) that separates the solar chromosphere from the corona. These brightenings, omnipresent in active region patches known as "moss" regions, could potentially contribute to the heating of active region plasma. In this study, we investigate the properties of SB events in…
KIC 8840638: A Newly Discovered Eclipsing Binary with δ Scuti–Type Oscillations
Yang, Tao-Zhi; Zuo, Zhao-Yu; Liu, Jun-Hui +4 more
In this paper, we analyze the light variation of KIC 8840638 using high-precision time-series data from the Kepler mission. The analysis reveals that this target is a new detached eclipsing binary system with a δ Scuti component, rather than a single δ Scuti star as previously known. The frequency analysis of short-cadence data reveals 95 signific…
TESS Observations of Outbursts on Polars—Superflares
Qian, Shengbang; Wang, Qishan; Fang, Xiaohui
Flare events are magnetic activities on the stellar surface, which can provide us with information about the accretion behavior and evolution of polars. In this paper, we search for flare events on polars from all the available 2 minute cadence TESS data through visual inspection, and identify six flare events on five flaring stars from 185 polars…
Calcium Bright Knots and the Formation of Chromospheric Anemone Jets on the Sun
Shibata, Kazunari; Singh, Kunwar Alkendra Pratap; Nishida, Keisuke
Space-based observations show that the solar atmosphere from the solar chromosphere to the solar corona is filled with small-scale jets and is linked with small-scale explosions. These jets may be produced by mechanisms similar to those of large-scale flares and such jets may be related to the heating of the corona and chromosphere as well as the …
Has the Palomar 14 Globular Cluster Been Captured by the Milky Way?
Kroupa, Pavel; Haghi, Hosein; Zonoozi, Akram Hasani +1 more
We examine a new scenario to model the outer halo globular cluster (GC) Palomar 14 (Pal 14) over its lifetime by performing a comprehensive set of direct N-body calculations. We assume Pal 14 was born in a now detached/disrupted dwarf galaxy with a strong tidal field. Pal 14 evolved there until the slope of the stellar mass function (MF) became cl…
X-Ray and Spectral Ultraviolet Observations of Periodic Pulsations in a Solar Flare Fan/Looptop
Reeves, Katharine K.; Kazachenko, Maria D.; Lörinčík, Juraj +3 more
We present simultaneous X-ray and spectral ultraviolet observations of strikingly coherent oscillations in emission from a coronal looptop and fan structure, during the impulsive phase of a long-duration M-class solar flare. The ≈50 s oscillations are observed near in-phase by Solar Orbiter/STIX, GOES, and IRIS Fe XXI intensity, Doppler, and nonth…