Ultraviolet spectroscopy of narrow coronal mass ejections

We present Ultraviolet Coronagraph Spectrometer (UVCS) observations of 5 narrow coronal mass ejections (CMEs) that were among 15 narrow CMEs originally selected by Gilbert et al. (2001). Two events (1999 March 27, April 15) were "structured", i.e. in white light data they exhibited well defined interior features, and three (1999 May 9, May 21, June 3) were "unstructured", i.e. appeared featureless. In UVCS data the events were seen as 4-13 deg wide enhancements of the strongest coronal lines HI Ly-alpha and OVI (1032,1037 A). We derived electron densities for several of the events from the Large Angle Spectrometric Coronagraph (LASCO) C2 white light observations. They are comparable to or smaller than densities inferred for other CMEs. We modeled the observable properties of examples of the structured (1999 April 15) and unstructured (1999 May 9) narrow CMEs at different heights in the corona between 1.5 and 2 R(Sun). The derived electron temperatures, densities and outflow speeds are similar for those two types of ejections. They were compared with properties of polar coronal jets and other CMEs. We discuss different scenarios of narrow CME formation either as a jet formed by reconnection onto open field lines or CME ejected by expansion of closed field structures. Overall, we conclude that the existing observations do not definitively place the narrow CMEs into the jet or the CME picture, but the acceleration of the 1999 April 15 event resembles acceleration seen in many CMEs, rather than constant speeds or deceleration observed in jets.Comment: AASTeX, 22 pages, incl. 3 figures (2 color) and 3 tables. Accepted for publication in Ap.

The hard X-ray burst spectrometer event listing 1980-1987

This event listing is a comprehensive reference for the Hard X-ray bursts detected with the Hard X-ray Burst Spectrometer on the Solar Maximum Mission from the time of launch 14 February 1980 to December 1987. Over 8600 X-ray events were detected in the energy range from 30 to approx. 600 keV with the vast majority being solar flares. The listing includes the start time, peak time, duration and peak rate of each event

Spectroscopic analysis of interaction between an EIT wave and a coronal upflow region

We report a spectroscopic analysis of an EIT wave event that occurred in active region 11081 on 2010 June 12 and was associated with an M2.0 class flare. The wave propagated near circularly. The south-eastern part of the wave front passed over an upflow region nearby a magnetic bipole. Using EIS raster observations for this region, we studied the properties of plasma dynamics in the wave front, as well as the interaction between the wave and the upflow region. We found a weak blueshift for the Fe XII {\lambda}195.12 and Fe XIII {\lambda}202.04 lines in the wave front. The local velocity along the solar surface, which is deduced from the line of sight velocity in the wave front and the projection effect, is much lower than the typical propagation speed of the wave. A more interesting finding is that the upflow and non-thermal velocities in the upflow region are suddenly diminished after the transit of the wave front. This implies a significant change of magnetic field orientation when the wave passed. As the lines in the upflow region are redirected, the velocity along the line of sight is diminished as a result. We suggest that this scenario is more in accordance with what was proposed in the field-line stretching model of EIT waves.Comment: 13 pages, 7 figures, accepted for publication in Ap

At the Same Time African Women and Mothers Resisted: Dialectical Constructions of Race and Gender in the Black Atlantic and Early Colonies of the New World

We find the rough beginning of this story in the dynamic and contingent scene of the early Atlantic. I say contingent because it is these early complex transatlantic (political and cultural) encounters that fundamentally shaped and shape the trajectory of modernity. At the heart of this development of modernity are constructions of race and gender. And given the contingency of history, it must be noted that, if responses to these encounters had been different, perhaps we would be living with a different modernity—maybe one with different or less harmful notions of race and gender difference. Understanding how these conceptualizations came to be is crucial for my more specific historical analysis of Black motherhood, so I find helpful frameworks in Paul Gilroy’s The Black Atlantic. Gilroy contributes an important narrative of modernity that complicates and resists the dominant one that aligns modern Western intellectual and cultural development with definitive nation-states

Monkey Houses or Revolutionary Legislatures? Moderating the Binary of Black Politicians in South Carolina

Writing this paper was an extensive process. It began early in the Spring semester—in ASI 120. From the beginning of the semester the ASI 120 students knew we would be writing a historiography in the realm of Reconstruction. To hone down a more specific topic, we were assigned Eric Foner’s A Short History of Reconstruction. By reading his account of Reconstruction, I was able to select a topic: black politicians in South Carolina. Next, a research librarian visited my seminar and introduced us to the research process. From there, I was able to gather sources and begin my annotated bibliography. To complete the annotated bibliography, I took elaborate and detailed notes on the historical interpretation of each author, and then proceeded to summarize each source. From the annotated bibliography, I worked at categorizing the sources and developing my argument for the paper—essentially, arguing for which source is the “best”, what is the criteria for being “the best”, and why. Once I settled on the criteria, I was able to form a draft of an argumentative historiography paper. I met with both Dr. Mackay and the Core Write Place Consultants to distill my drafts to more concise and effective versions. After some final grammar and structure tweaks, I submitted my final paper to my instructor, Dr. Mackay

The Body and Blood: What Was and Is at Stake in the Protestant Reformation

This paper is an explanation of Robert A. Orsi\u27s concept of presence from the introduction and first chapter of his book titled, History and Presence. Before writing any paper for a class, I thoroughly review the syllabus for the assignment. Based on the requirements listed in the syllabus, and on the discussion we had in seminar about the Orsi text and Dr. Smith\u27s lecture on the religious origins of modernity, I drafted an outline of my paper. Throughout the process of creating my outline, I considered various organizations for my explanation as well as a few different arguments I could make in my paper about Orsi\u27s solution to the problem of modern religion. The strongest organization and arguments, I found, highlighted and emphasized my personal experiences with presence and absence in my own religious upbringing. As a result, my first paper draft included these personal experiences. I brought this first draft to a conference with my ASI 110 professor, Dr. Mackay, and she helped me strengthen and unify my paper. Then, I edited my paper with her comments in mind before I went to a Core Write Place Consultant, Ethan, who helped me fine-tune my paper. After the consult, I edited the paper again before showing it to Dr. Mackay one last time before submitting it just to make sure I was really on the right track

Oratory

The crafting of persuasive appeals that finds its conditions of possibility in and has the capacity to exceed the context of its production. Sophistic oratory can be read as both a symptom of and a cha llenge to the socioeconomic, politica l, and cu ltural climate of ancient Greece. Emerging out of a society destab ilized by the precarious movement from fragmentation and tyrannical rule toward unification and democracy, sophistic oratory was a force of transformation within the polis. Anticipating the Aristotelian division of rhetoric into forensic, deliberative, and epideictic types, sophistic oratory played an active ro le in the reclamation of property lost in tyrannical rule, the instruction of proper citizenry and just govern ance, and the inculcation of va lues through the praise and blame of prominent figures

Anabaptists and Postmodernity

The title of this book was intended simply to bring together two concerns: Anabaptist identity on the one hand and our postmodern cultural moment on the other. Thus the purpose of the book was to inquire about the relationship between the two. The aim was to seek answers to such questions as what it means to be an Anabaptist today, the extent to which postmodernity presents problems and possibilities for Anabaptists, and how Anabaptists ought to live out their faith in the contemporary context

Large-scale Bright Fronts in the Solar Corona: A Review of "EIT waves"

``EIT waves" are large-scale coronal bright fronts (CBFs) that were first observed in 195 \AA\ images obtained using the Extreme-ultraviolet Imaging Telescope (EIT) onboard the \emph{Solar and Heliospheric Observatory (SOHO)}. Commonly called ``EIT waves", CBFs typically appear as diffuse fronts that propagate pseudo-radially across the solar disk at velocities of 100--700 km s$^{-1}$ with front widths of 50-100 Mm. As their speed is greater than the quiet coronal sound speed ($c_s\leq$200 km s$^{-1}$) and comparable to the local Alfv\'{e}n speed ($v_A\leq$1000 km s$^{-1}$), they were initially interpreted as fast-mode magnetoacoustic waves ($v_{f}=(c_s^2 + v_A^2)^{1/2}$). Their propagation is now known to be modified by regions where the magnetosonic sound speed varies, such as active regions and coronal holes, but there is also evidence for stationary CBFs at coronal hole boundaries. The latter has led to the suggestion that they may be a manifestation of a processes such as Joule heating or magnetic reconnection, rather than a wave-related phenomena. While the general morphological and kinematic properties of CBFs and their association with coronal mass ejections have now been well described, there are many questions regarding their excitation and propagation. In particular, the theoretical interpretation of these enigmatic events as magnetohydrodynamic waves or due to changes in magnetic topology remains the topic of much debate.Comment: 34 pages, 19 figure