Prominence Thread Seismology Using the P 1/2P 2 Ratio
Prominence threads are expected to be cold plasma condensations in a long magnetic tube. Because of this density inhomogeneity along the magnetic field, the...
Prompt and Follow-up Multi-wavelength Observations of the GRB 161017A
This paper presents data on the simultaneous and complementary observations of the gamma-ray burst (GRB) GRB 161017A for optical, X-ray, and gamma wavelengths...
Propagating Waves Transverse to the Magnetic Field in a Solar Prominence
We report an unusual set of observations of waves in a large prominence pillar that consist of pulses propagating perpendicular to the prominence magnetic field...
Propagation of ionizing radiation in H II regions: The effects of optically thick density fluctuations
The accepted explanation of the observed dichotomy of two orders of magnitude between in situ measurements of electron density in H II regions, derived from...
Propagation of untwisting solar jets from the low-beta corona into the super-Alfvénic wind: Testing a solar origin scenario for switchbacks
Context. Parker Solar Probe's (PSP) discovery of the prevalence of switchbacks (SBs), localised magnetic deflections in the nascent solar wind, has sparked...
Propagation of Waves in Weakly Ionized Two-fluid Plasmas. I. Small-amplitude Alfvénic Waves
The large abundance of electrically neutral particles has a remarkable impact on the dynamics of many astrophysical plasmas. Here, we use a two-fluid model that...
Proper motion and apparent contraction in J0650+6001
We present a multi-epoch and multifrequency very long baseline interferometry (VLBI) study of the compact radio source J0650+6001. In VLBI images, the source is...
Proper motion L and T dwarf candidate members of the Pleiades
We present the results of a deep optical-near-infrared (optical-NIR) multi-epoch survey covering 2.5 deg2 of the Pleiades open star cluster to search for new...
Proper Motions and Orbits of Distant Local Group Dwarf Galaxies from a Combination of Gaia and Hubble Data
We have determined the proper motions (PMs) of 12 dwarf galaxies in the Local Group (LG), ranging from the outer Milky Way (MW) halo to the edge of the LG. We...