Search Publications
Multipoint Detection of GRB221009A's Propagation through the Heliosphere
Wilson, Lynn; Balikhin, Michael; Larson, Davin +9 more
We present the results of processing the effects of the powerful gamma-ray burst GRB221009A captured by the charged particle detectors (electrostatic analyzers and solid-state detectors) on board spacecraft at different points in the heliosphere on 2022 October 9. To follow the GRB221009A propagation through the heliosphere, we used the electron a…
Non-universality of the Turbulent Spectra at Sub-ion Scales in the Solar Wind: Dispersive Effects versus the Doppler Shift
Sahraoui, Fouad; Huang, Shiyong
Large surveys of the power spectral density of the magnetic fluctuations in the solar wind have reported different slope distributions at MHD, sub-ion and sub-electron scales: the smaller the scale, the broader the distribution. Here, we review briefly some of the most relevant explanations of the broadening of the slopes at sub-ion scales. Then, …
A Surprising Periodicity Detected during a Super-outburst of V844 Herculis by TESS
Thorstensen, John R.; Garnavich, Peter; Littlefield, Colin +6 more
We identify a previously undetected periodicity at a frequency of 49.08 ± 0.01 days-1 (period of 29.34 ± 0.01 minutes) during a super-outburst of V844 Her observed by TESS. V844 Her is an SU UMa type cataclysmic variable with an orbital period of 78.69 minutes, near the period minimum. The frequency of this new signal is constant in con…
The Advanced Spectral Library: The Evolution of Chromospheric Wind Characteristics from Noncoronal to Hybrid Giant Stars
Carpenter, Kenneth G.; Nielsen, Krister E.; Airapetian, Vladimir S. +1 more
The Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph treasury program Advanced Spectral Library enables investigations of the characteristics and dynamics of the wind and chromosphere of cool stars using high-quality spectral data. This paper shows how the wind features change with spectral class when transferring across the Linsk…
The Signature of the Northern Galactic Center Region in Low-velocity UV Absorption
Fox, Andrew J.; Bordoloi, Rongmon; Ashley, Trisha +1 more
The Galactic Center (GC) is surrounded by plasma lobes that extend up to ~14 kpc above and below the plane. Until now, UV absorption studies of these lobes have only focused on high-velocity components (∣v LSR∣ > 100 km s-1) because low- and intermediate-velocity (LIV) components (∣v LSR∣ < 100 km s-1
Observation of Turbulent Magnetohydrodynamic Cascade in the Jovian Magnetosheath
McComas, D. J.; Szalay, J. R.; Ebert, R. W. +6 more
We present the first estimation of the energy cascade rate in Jupiter's magnetosheath (MS). We use in situ observations from the Jovian Auroral Distributions Experiment and the magnetometer investigation instruments on board the Juno spacecraft, in concert with two recent compressible models, to investigate the cascade rate in the magnetohydrodyna…
Chandra Observation of NGC 1559: Eight Ultraluminous X-Ray Sources Including a Compact Binary Candidate
Kong, Albert K. H.; Chu, You-Hua; Li, Kwan-Lok +1 more
Despite the 30 yr history of ultraluminous X-ray sources (ULXs) studies, issues such as the majority of their physical natures (i.e., neutron stars, stellar-mass black holes, or intermediate black holes) as well as the accretion mechanisms are still under debate. Expanding the ULX sample size in the literature is clearly a way to help. To this end…
Solar Energetic Particle Events with Short and Long Onset Times
Yashiro, Seiji; Nitta, Nariaki V.; Asai, Ayumi +1 more
Gradual solar energetic particle (SEP) events, usually attributed to shock waves driven by coronal mass ejections (CMEs), show a wide variety of temporal behaviors. For example, TO, the >10 MeV proton onset time with respect to the launch of the CME, has a distribution of at least an order of magnitude, even when the source region is not far fr…
Diagnostics from Polarization of Scattered Optical Light from Galactic Infrared Cirrus
Martin, Peter G.; Bowes, Shannon K.
We propose polarization of scattered optical light from intermediate Galactic latitude infrared cirrus as a new diagnostic to constrain models of interstellar dust and the anisotropic interstellar radiation field (aISRF). For single scattering by a sphere, with Mie scattering phase functions for intensity and polarized intensity for a dust model a…
Physics and Chemistry of Radiation Driven Cloud Evolution. [C II] Kinematics of IC 59, and IC 63
Soam, Archana; Andersson, B. -G.; Güsten, Rolf +5 more
We used high-resolution [C II] 158 µm mapping of two nebulae IC 59 and IC 63 from SOFIA/upGREAT in conjunction with ancillary data of the gas, dust, and polarization to probe the kinematics, structure, and magnetic properties of their photodissociation regions (PDRs). The nebulae are part of the Sh 2-185 H II region that is illuminated by th…