Search Publications
Magnetic Nulls in the Reconnection Driven by Turbulence
Dunlop, M. W.; Wang, Z.; Fu, H. S. +5 more
For the first time, we use spacecraft measurements to investigate the magnetic nulls in a reconnection event driven by turbulence in the magnetosheath. We particularly focus on the relation between magnetic-null topologies and currents, which can be decomposed into a component perpendicular to spine ({J}\perp ) and a component parallel …
Evidence for a Neutral Iron Line Generated by MeV Protons from Supernova Remnants Interacting with Molecular Clouds
Koyama, Katsuji; Uchida, Hiroyuki; Nobukawa, Masayoshi +6 more
Supernova remnants (SNRs) have been prime candidates for Galactic cosmic-ray accelerators. When low-energy cosmic-ray protons (LECRp) collide with interstellar gas, they ionize neutral iron atoms and emit the neutral iron line (Fe I Kα) at 6.40 keV. We search for the iron K-shell line in seven SNRs from the Suzaku archive data of the Galactic plan…
Ultra-red Galaxies Signpost Candidate Protoclusters at High Redshift
Ivison, R. J.; Omont, A.; Clements, D. L. +20 more
We present images obtained with LABOCA of a sample of 22 galaxies selected via their red Herschel SPIRE colors. We aim to see if these luminous, rare, and distant galaxies are signposting dense regions in the early universe. Our 870 µm survey covers an area of ≈1 deg2 down to an average rms of 3.9 {mJy} {beam}}-1, with …
High-resolution Observations of Flares in an Arch Filament System
Cao, Wenda; Liu, Rui; Ahn, Kwangsu +3 more
We study five sequential solar flares (SOL2015-08-07) occurring in Active Region 12396 observed with the Goode Solar Telescope (GST) at the Big Bear Solar Observatory, complemented by Interface Region Imaging Spectrograph and SDO observations. The main flaring region is an arch filament system (AFS) consisting of multiple bundles of dark filament …
Signatures of Solar Cycle 25 in Subsurface Zonal Flows
Thompson, M. J.; Howe, R.; Komm, R. +5 more
The pattern of migrating zonal flow bands associated with the solar cycle, known as the torsional oscillation, has been monitored with continuous global helioseismic observations by the Global Oscillations Network Group (GONG), together with those made by the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO) and…
Characteristics and Energy Dependence of Recurrent Galactic Cosmic-Ray Flux Depressions and of a Forbush Decrease with LISA Pathfinder
Mendes, L.; Russano, G.; Lloro, I. +82 more
Galactic cosmic-ray (GCR) energy spectra observed in the inner heliosphere are modulated by the solar activity, the solar polarity and structures of solar and interplanetary origin. A high counting rate particle detector (PD) aboard LISA Pathfinder, meant for subsystems diagnostics, was devoted to the measurement of GCR and solar energetic particl…
A Multiwavelength View of the Neutron Star Binary 1FGL J1417.7-4402: A Progenitor to Canonical Millisecond Pulsars
Strader, Jay; Bahramian, Arash; Cheung, C. C. +6 more
The Fermi γ-ray source 1FGL J1417.7-4407 (J1417) is a compact X-ray binary with a neutron star primary and a red giant companion in a ∼5.4 days orbit. This initial conclusion, based on optical and X-ray data, was confirmed when a 2.66 ms radio pulsar was found at the same location (and with the same orbital properties) as the optical/X-ray source.…
Deciphering the Activity and Quiescence of High-redshift Cluster Environments: ALMA Observations of Cl J1449+0856 at z = 2
Finoguenov, A.; Cimatti, A.; Daddi, E. +13 more
We present Atacama Large Millimeter/submillimeter Array observations of the 870 µm continuum and CO(4-3) line emission in the core of the galaxy cluster Cl J1449+0856 at z = 2, a near-IR-selected, X-ray-detected system in the mass range of typical progenitors of today’s massive clusters. The 870 µm map reveals six F 870µm
Two-phase Heating in Flaring Loops
Qiu, Jiong; Longcope, Dana W.; Zhu, Chunming
We analyze and model a C5.7 two-ribbon solar flare observed by the Solar Dynamics Observatory, Hinode, and GOES on 2011 December 26. The flare is made of many loops formed and heated successively over one and half hours, and their footpoints are brightened in the UV 1600 Å before enhanced soft X-ray and EUV missions are observed in flare loops. As…
A Data-constrained Model for Coronal Mass Ejections Using the Graduated Cylindrical Shell Method
Singh, T.; Yalim, M. S.; Pogorelov, N. V.
Coronal mass ejections (CMEs) are major drivers of extreme space weather conditions, as this is a matter of serious concern for our modern technologically dependent society. The development of numerical approaches that would simulate CME generation and propagation through the interplanetary space is an important step toward our capability to predi…