Observations of super flare occurrence (with energy 1033–1036 erg)s in low mass stars like M dwarfs still remains as a puzzle. In this paper we have inferred the typical sizes and characteristics of magnetic fields associated with active regions in M dwarfs responsible for these super flares. This is done by extrapolation of physical conditions associated with largest solar flares. The average poloidal and toroidal magnetic fields near the surface of selected M dwarfs will be also inferred in this context.

A quarter of a century has passed since the observing technique of integral field spectroscopy (IFS) was first applied to planetary nebulae (PNe). Progress after the early experiments was relatively slow, mainly because of the limited field-of-view (FoV) of first generation instruments. With the advent of MUSE at the ESO Very Large Telescope, this situation has changed. MUSE is a wide field-of-view, high angular resolution, one-octave spanning optical integral field spectrograph with high throughput. Its major science mission has enabled an unprecedented sensitive search for Lyα emitting galaxies at redshift up to z=6.5. This unique property can be utilized for faint objects at low redshift as well. It has been demonstrated that MUSE is an ideal instrument to detect and measure extragalactic PNe with high photometric accuracy down to very faint magnitudes out to distances of 30 Mpc, even within high surface brightness regions of their host galaxies. When coupled with a differential emission line filtering (DELF) technique, MUSE becomes far superior to conventional narrow-band imaging, and therefore MUSE is ideal for accurate Planetary Nebula Luminosity Function (PNLF) distance determinations. MUSE enables the PNLF to become a competitive tool for an independent measure of the Hubble constant, and stellar population studies of the host galaxies that present a sufficiently large number of PNe.

My thanks to the reviewers for their insightful comments and to the editors of Church History, most especially Jon Butler, for shepherding the reviews. Having once served as a Church History editor, I appreciate his labors even more.

The COVID-19 pandemic brought about at least two normative challenges on unprecedented scale for liberal democracies. One concerned prioritization decisions when health care resources were constrained. The other, which arguably led to lasting damage to social cohesion and citizens’ trust in government and government public health institutions, concerned policies introduced with the aim of reducing the spread of SARS-CoV2, some of which turned out to be mistaken. I discuss in this essay a few examples of misguided, liberty-limiting public health policies and describe how public health and public health ethics principlism provided cover for such policies. Citizens had reasons to be concerned about the duration of such liberty-infringing policies, the absence of predictable government policies, and the absence of transparent justifications for the policies that were implemented.

The Multi-Unit Spectroscopic Explorer (MUSE) has enabled a renaissance of the planetary nebula luminosity function (PNLF) as a standard candle. In the case of NGC 300, we learned that the precise spectrophotometry of MUSE was crucial to obtain an accurate PNLF distance. We present the advantage of the integral field spectrograph compared to the slit spectrograph in delivering precise spectrophotometry by simulating a slit observation on integral field spectroscopy data. We also discuss the possible systematic shift in measuring the PNLF distance using the least-square method, especially when the PNLF cutoff is affected by small number statistics.

A scholium in codex Vaticanus graecus 156 provides evidence that Cassius Dio's Roman History once contained an explicit reference to the ludi saeculares of a.d. 204, something that has been denied in recent scholarship.

When he was nearing the end of his life, Viktor Shklovskii recorded an oral interview that was recently digitized and published by the Moscow oral history project (http://www.oralhistory.ru). During the audio encoding process, Shklovskii's voice and the contents of the interview were badly distorted. This article frames noise as an important force that impacts not only how sound documents become authoritative archival evidence, but also indexically points to the context of their creation. To do so, I compare the role that sound plays in Shklovskii's own writing with the history of the Soviet state's archival preservation of sound, a variety of amateur sound recording projects, and mainstream discussions of audio quality and sound recording in the Soviet press. Ultimately, I argue that for audio researchers, making room for noise allows us to see the emancipatory gesture embedded within amateur tape recording itself: the ambiguous noise that seemingly marred unpolished recordings can instead be heard as a sonic alternative to official narratives.