The first SEPServer event catalogue ~68-MeV solar proton events observed at 1 AU in 1996-2010

SEPServer is a three-year collaborative project funded by the seventh framework programme (FP7-SPACE) of the European Union. The objective of the project is to provide access to state-of-the-art observations and analysis tools for the scientific community on solar energetic particle (SEP) events and related electromagnetic (EM) emissions. The project will eventually lead to better understanding of the particle acceleration and transport processes at the Sun and in the inner heliosphere. These processes lead to SEP events that form one of the key elements of space weather. In this paper we present the first results from the systematic analysis work performed on the following datasets: SOHO/ERNE, SOHO/EPHIN, ACE/EPAM, Wind/WAVES and GOES X-rays. A catalogue of SEP events at 1 AU, with complete coverage over solar cycle 23, based on high-energy (~68-MeV) protons from SOHO/ERNE and electron recordings of the events by SOHO/EPHIN and ACE/EPAM are presented. A total of 115 energetic particle events have been identified and analysed using velocity dispersion analysis (VDA) for protons and time-shifting analysis (TSA) for electrons and protons in order to infer the SEP release times at the Sun. EM observations during the times of the SEP event onset have been gathered and compared to the release time estimates of particles. Data from those events that occurred during the European day-time, i.e., those that also have observations from ground-based observatories included in SEPServer, are listed and a preliminary analysis of their associations is presented. We find that VDA results for protons can be a useful tool for the analysis of proton release times, but if the derived proton path length is out of a range of 1 AU < s a 2 3 AU, the result of the analysis may be compromised, as indicated by the anti-correlation of the derived path length and release time delay from the associated X-ray flare. The average path length derived from VDA is about 1.9 times the nominal length of the spiral magnetic field line. This implies that the path length of first-arriving MeV to deka-MeV protons is affected by interplanetary scattering. TSA of near-relativistic electrons results in a release time that shows significant scatter with respect to the EM emissions but with a trend of being delayed more with increasing distance between the flare and the nominal footpoint of the Earth-connected field line

The first SEPServer event catalogue ~68-MeV solar proton events observed at 1 AU in 1996-2010

SEPServer is a three-year collaborative project funded by the seventh framework programme (FP7-SPACE) of the European Union. The objective of the project is to provide access to state-of-the-art observations and analysis tools for the scientific community on solar energetic particle (SEP) events and related electromagnetic (EM) emissions. The project will eventually lead to better understanding of the particle acceleration and transport processes at the Sun and in the inner heliosphere. These processes lead to SEP events that form one of the key elements of space weather. In&nbsp; this paper we present the first results from the systematic analysis work performed on the following datasets: SOHO/ERNE, SOHO/EPHIN, ACE/EPAM, Wind/WAVES and GOES X-rays. A catalogue of SEP events at 1 AU, with complete coverage over solar cycle 23, based on high-energy (~68-MeV) protons from SOHO/ERNE and electron recordings of the events by SOHO/EPHIN and ACE/EPAM are presented. A total of 115 energetic particle events have been identified and analysed using velocity dispersion analysis (VDA) for protons and time-shifting analysis (TSA) for electrons and protons in order to infer the SEP release times at the Sun. EM observations during the times of the SEP event onset have been gathered and compared to the release time estimates of particles. Data from those events that occurred during the European day-time, i.e., those that also have observations from ground-based observatories included in SEPServer, are listed and a preliminary analysis of their associations is presented. We find that VDA results for protons can be a useful tool for the analysis of proton release times, but if the derived proton path length is out of a range of 1 AU &lt; s &lt; 3 AU, the result of the analysis may be compromised, as indicated by the anti-correlation of the derived path length and release time delay from the associated X-ray flare. The average path length derived from VDA is about 1.9 times the nominal length of the spiral magnetic field line. This implies that the path length of first-arriving&nbsp; MeV to deka-MeV protons is affected by interplanetary scattering. TSA of near-relativistic electrons results in a release time that shows significant scatter with respect to the EM emissions but with a trend of being delayed more with increasing distance between the flare and the nominal footpoint of the Earth-connected field line

Multimodal and collaborative practices in the organization of word searches in lingua franca military meetings

Abstract This study investigates word finding difficulties in military meetings during a crisis management exercise in which English is used as a lingua franca (ELF). Multimodal conversation analysis (CA) is used to examine how searching for a next item in a turn-in-progress, i.e., a word search, is attended to via coordination of verbal and embodied conduct. The analysis shows different kinds of word search organizations: searches can be initiated and carried out without recruiting the co-participants’ assistance, co-participation can be invited to varying degrees, and searches can be collaboratively completed without the speaker’s visible attempts to solicit assistance. These organizations are illustrative of the institutional and interactional context, namely that the opportunities to invite and manage co-participation via verbal and bodily-visual resources, such as gaze and indexing or iconic gestures, are in some cases more limited than in others. These opportunities are foremost connected to the sequential and sociomaterial environment of word searches and the situated roles enacted by the participants. The study highlights word searches as discrete activities that make linguistic and epistemic discrepancies between the speaker and co-participants relevant and negotiable in the moment-by-moment unfolding of interaction

Negotiating collaborative and inclusive practices in university students’ group-to-group videoconferencing sessions

Abstract In group-to-group videoconferencing (VC), social actions are coordinated between participants in the physical and online environment, which raises the practical problem of how to manage the interactional space in a collaborative and inclusive manner. This can be particularly challenging for less experienced (i.e., novice) users of VC. The present study uses multimodal conversation analysis (CA) to investigate how university students, who speak English as a foreign language, organise their conduct in the moment-by-moment unfolding of VC. It focuses on moments that make additional interactional work to include the remote party salient, namely transitions regarding next-speaker selection and topic change. The analysis illustrates the reflexive use of different constellations of talk and screen-oriented behaviours as key for coordinating actions in the VC environment. The study has implications for educational research and practice, since it helps understand the interactional competence learners need to develop to succeed in environments of online collaborative work

Material and embodied resources in the accomplishment of closings in technology-mediated business meetings

Abstract This study uses conversation analysis (CA) and video-recorded data from an international company to investigate closings in technology-mediated (i.e. distant) meetings. The focus is on the situated affordances and multimodal resources that the chair and participants deploy to transition from meeting talk to a coordinated exit. Due to restricted access to bodily-visual leave-taking behaviours, other mutually recognized practices need to be implemented to initiate and advance closings: (1) when closing is made relevant as the next step, (2) when opportunity spaces to move out of the closing emerge, and (3) when departure from the meeting needs to be negotiated. This progression requires the close coordination of co-participants’ vocal and embodied conduct in the physical setting and rendering actions publicly intelligible via the screen at specific moments. The analysis portrays closings as emergent, collaborative accomplishments, in which the import of multimodal turn constructions and (dis)aligning behaviours must be negotiated in situ

Interactional spaces in stationary, mobile, video-mediated and virtual encounters

Abstract In any focused social interaction, people come together, move, and position their bodies with respect to each other, and maintain and change such formations while they interact. Establishing and sustaining such formations makes it possible for them to see and hear others, to show and share objects, and to orient to same features in the environment. Forming copresence and a shared space is core and a precondition to any social interaction. Since the influential work by Adam Kendon (F-formations) and Erving Goffman (participation frameworks, focused encounters, withs) an accumulating body of research has explored — in different interactional settings — the pragmatics of how humans organize themselves spatially for interacting with each other. More recently, Lorenza Mondada (2009) has introduced the term “interactional space” to refer to the dynamic ways in which people not only initiate and establish copresent formations but also continuously (re)organize them with respect to each other, the unfolding activity and material environment. In this chapter, we offer an overview of pragmatics research on spatial arrangements in interaction. We illustrate how people organize their copresence in order to interact with each other in stable, mobile, video-mediated (i.e., distributed) and virtual settings. We explore “interactional space” as a visual phenomenon and thereby focus on situations where participants can (at least partly) see each other

Vuorovaikutuksen näkökulma vieraskielisiin etäopetustilanteisiin:haasteita ja käytänteitä

Millaista vuorovaikutus on tilanteissa, joissa opettaja ja oppijat ovat fyysisesti eri paikoissa? Millaiset käytänteet ovat toimivia? Miten oppijoiden osallistumista ja sitoutumista voidaan parhaiten tukea? Muun muassa näihin etäopetukseen liittyviin kysymyksiin on etsitty kuluneen koronapandemian aikana vastauksia. Vuorovaikutuksen tutkimus on yksi alue, joka voi auttaa ymmärtämään ja kehittämään nykyisiä ja tulevia käytännön ratkaisuja paremmin.nonPeerReviewe

University students’ (dis)engagement experiences in synchronous sessions during the COVID-19 pandemic

Abstract In the past two years, student engagement in online learning situations has become a mutual concern for educators all over the world. The impact of working in online environments and using video and other communication channels on students’ learning experiences is still not fully understood. The present study addresses this question by drawing on students’ written reflections and interviews from the Finnish higher education context collected during the COVID-19 pandemic. It uses the qualitative method of thematic analysis to investigate students’ experiences of interacting in synchronous sessions and their perceptions on (dis)engagement. The analysis shows the importance of versatile teaching methods and enhanced participation, the use of web cameras and anti-distraction strategies for engagement. In contrast, some aspects, such as communication issues, camera-induced self-awareness, and distractions from one’s physical and digital surroundings, pertain to disengagement. The study contributes to a better understanding of the common challenges and affordances of distributed learning environments on student engagement, but also shows individual differences in how these are perceived. The findings have implications for online teaching pedagogy and course design in general and higher education in particular

Kinetics of the γ → ε Martensitic Transformation in Fine-Grained Fe-26Mn-0.14C Austenitic Steel

A high-Mn Fe-26Mn-0.14C austenitic steel was hot deformed at 900 °C, 1000 °C, and 1100 °C with the strain rate of 5 s−1 followed by air cooling (AC) or water quenching (WQ). Deformation at 1100 °C results in the occurrence of dynamic recrystallization (DRX) that produces a fine grain size (∼10 μm), which was found to prevent the γ fcc → ε hcp transformation upon cooling. The transformation in the fine-grained austenite is insensitive to the defect concentration. Isothermal holding of the dynamically recrystallized specimen at 1100 °C for 3 minutes results in grain growth (∼40 μm). The coarser grain size was observed to allow the transformation to proceed (17 pct martensite). The role of grain boundaries, twins, and faults in suppressing the phase transformation is discussed