Effect of EMIC waves on relativistic and ultrarelativistic electron populations: Ground-based and Van Allen Probes observations

Abstract We study the effect of electromagnetic ion cyclotron (EMIC) waves on the loss and pitch angle scattering of relativistic and ultrarelativistic electrons during the recovery phase of a moderate geomagnetic storm on 11 October 2012. The EMIC wave activity was observed in situ on the Van Allen Probes and conjugately on the ground across the Canadian Array for Real-time Investigations of Magnetic Activity throughout an extended 18 h interval. However, neither enhanced precipitation of \u3e0.7 MeV electrons nor reductions in Van Allen Probe 90° pitch angle ultrarelativistic electron flux were observed. Computed radiation belt electron pitch angle diffusion rates demonstrate that rapid pitch angle diffusion is confined to low pitch angles and cannot reach 90°. For the first time, from both observational and modeling perspectives, we show evidence of EMIC waves triggering ultrarelativistic (~2-8 MeV) electron loss but which is confined to pitch angles below around 45° and not affecting the core distribution. Key Points EMIC wave activity is not associated with precipitation of MeV electrons EMIC waves do not deplete the ultra-relativistic belt down to 90° EMIC waves cause loss of low pitch angle electrons with energies ~2-8 MeV

On the storm‐time evolution of relativistic electron phase space density in Earth's outer radiation belt

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/98813/1/jgra50151.pd

Competing source and loss mechanisms due to wave-particle interactions in Earth’s outer radiation belt during the 30 September to 3 October 2012 geomagnetic storm

Abstract Drastic variations of Earth’s outer radiation belt electrons ultimately result from various competing source, loss, and transport processes, to which wave-particle interactions are critically important. Using 15 spacecraft including NASA’s Van Allen Probes, THEMIS, and SAMPEX missions and NOAA’s GOES and POES constellations, we investigated the evolution of the outer belt during the strong geomagnetic storm of 30 September to 3 October 2012. This storm’s main phase dropout exhibited enhanced losses to the atmosphere at L*\u3c 4, where the phase space density (PSD) of multi-MeV electrons dropped by over an order of magnitude in1 MeV electrons and energetic protons, SAMPEX \u3e1 MeV electrons, and ground observations of band-limited Pc1-2 wave activity, we show that this sudden loss was consistent with pitch angle scattering by electromagnetic ion cyclotron waves in the dusk magnetic local time sector at 3\u3c L*\u3c 4. At 4\u3c L*\u3c 5, local acceleration was also active during the main and early recovery phases, when growing peaks in electron PSD were observed by both Van Allen Probes and THEMIS. This acceleration corresponded to the period when IMF Bz was southward, the AE index was \u3e300 nT, and energetic electron injections and whistler-mode chorus waves were observed throughout the inner magnetosphere for \u3e12 h. After this period, Bz turned northward, and injections, chorus activity, and enhancements in PSD ceased. Overall, the outer belt was depleted by this storm. From the unprecedented level of observations available, we show direct evidence of the competitive nature of different wave-particle interactions controlling relativistic electron fluxes in the outer radiation belt

Indices of 3-hour pH-metry in young overweighed patients with GERD

In the study there were 35 overweighed patients with GERD (study group - SG), clinical comparison group (CCG) consisted of 20 standard patients with GERD. Alkaline reflux was revealed in 22 patients (62 %) of SG and 7 patients (33 %) of CCG, while acid reflux was revealed in 13 persons (38 %) of SG and 13 persons (67 %) of CCG. The comparison of the groups showed that the alkaline reflux was more common in patients of SG, significant differences were determined between the acidity rate in an esophagus at rest and during stimulation (p < 0,05). In patients of the groups with acid reflux significant differences were determined in the esophagus at rest and during stimulation (p < 0,05), in forestomach - at rest and after stimulation (p < 0,05). In overweighed patients complaining of heartburn alkaline reflux is more common while patients with normal weight have acid reflux. In SG life activity (p < 0,05), social function (p < 0,05), mental health (p < 0,05) were statistically reduced, pain in the upper epigastric severely limits daily activity (p < 0,05) compared to the CCG. Our results demonstrate that patients need to be treated of GERD in a different way considering the body weight

Authentic Family Collection Textiles: A Contemporary Context

Статья представляет собой аналитический обзор произведений межрегиональной выставки «Хранители семейных традиций» состоявшейся в мае 2021 года в Новосибирском государственном художественном музее. На примере отдельных произведений (частное) обосновываются обобщающие факторы (всеобщее). В результате стилистического, семантического анализа художественного текста произведений определены системные факторы организации выставки как отражения менталитета эпохи, мировоззрения социальных, национальных, этнических групп и их индивидов. Искусствоведческий анализ позволил рассмотреть произведения как целостные художественные образы, существующие в диалектическом взаимодействии процесса и результата – эволюция и трансформация картины мира авторов, – и соотнести ее с картиной мира наших современников путем создания последовательно развивающегося нарратива экспозиции. Событийный анализ выявил закономерность содержания и организации выставки: каждый элемент произведения, само произведение и их собрание в экспозиции построены как взаимодействующие во времени и пространстве. Таким образом, каждый экспонат отражает определенный момент эпохи, а их совокупность – ее развитиеThe article is an analytical review of the works of the interregional exhibition «Keepers of Family Traditions» held in May 2021 at the Novosibirsk State Art Museum. Generalizing factors (general) are justified on the example of individual works (particular). As a result of the stylistic, semantic analysis of the literary text of the works, the systemic factors of the organization of the exhibition are determined as a reflection of the mentality of the era, the worldview of social, national, ethnic groups and their individuals. Art historical analysis allowed us to consider the work as a holistic artistic image that exists in the dialectical interaction of process and result: the evolution and transformation of the author’s picture of the world, and its correlation with the picture of the world of our contemporaries by creating a consistently developing narrative of the exposition. Event analysis revealed the regularity of the content and organization of the exhibition: each element of the work, the work itself and their collection in the exhibition are built as interacting in time and space. Thus, each exhibit reflects a certain moment of the era, and their totality reflects its developmen

Investigation of EMIC wave scattering as the cause for the BARREL 17 January 2013 relativistic electron precipitation event: A quantitative comparison of simulation with observations

Abstract Electromagnetic ion cyclotron (EMIC) waves were observed at multiple observatory locations for several hours on 17 January 2013. During the wave activity period, a duskside relativistic electron precipitation (REP) event was observed by one of the Balloon Array for Radiation belt Relativistic Electron Losses (BARREL) balloons and was magnetically mapped close to Geostationary Operational Environmental Satellite (GOES) 13. We simulate the relativistic electron pitch angle diffusion caused by gyroresonant interactions with EMIC waves using wave and particle data measured by multiple instruments on board GOES 13 and the Van Allen Probes. We show that the count rate, the energy distribution, and the time variation of the simulated precipitation all agree very well with the balloon observations, suggesting that EMIC wave scattering was likely the cause for the precipitation event. The event reported here is the first balloon REP event with closely conjugate EMIC wave observations, and our study employs the most detailed quantitative analysis on the link of EMIC waves with observed REP to date. Key PointsQuantitative analysis of the first balloon REP with closely conjugate EMIC wavesOur simulation suggests EMIC waves to be a viable cause for the REP eventThe adopted model is proved to be applicable to simulating the REP event

Observations of coincident EMIC wave activity and dusk-side energetic electron precipitation on 18-19 January 2013

Electromagnetic ion cyclotron (EMIC) waves have been suggested to be a cause of radiation belt electron loss to the atmosphere. Here simultaneous, magnetically conjugate measurements are presented of EMIC wave activity, measured at geosynchronous orbit and on the ground, and energetic electron precipitation, seen by the BARREL balloon campaign, on two consecutive days in January 2013. Multiple bursts of precipitation were observed on the dusk-side of the magnetosphere at the end of 18 Jan and again late on 19 Jan, concurrent with particle injections, substorm activity, and enhanced magnetospheric convection. The structure, timing, and spatial extent of the waves are compared to those of the precipitation during both days to determine when and where EMIC waves cause radiation belt electron precipitation. The conjugate measurements presented here provide observational support of the theoretical picture of dusk-side interaction of EMIC waves and MeV electrons leading to radiation belt loss

Measurements of fiducial and differential cross sections for Higgs boson production in the diphoton decay channel at s√=8 TeV with ATLAS

Measurements of fiducial and differential cross sections are presented for Higgs boson production in proton-proton collisions at a centre-of-mass energy of s√=8 TeV. The analysis is performed in the H → γγ decay channel using 20.3 fb−1 of data recorded by the ATLAS experiment at the CERN Large Hadron Collider. The signal is extracted using a fit to the diphoton invariant mass spectrum assuming that the width of the resonance is much smaller than the experimental resolution. The signal yields are corrected for the effects of detector inefficiency and resolution. The pp → H → γγ fiducial cross section is measured to be 43.2 ±9.4(stat.) − 2.9 + 3.2 (syst.) ±1.2(lumi)fb for a Higgs boson of mass 125.4GeV decaying to two isolated photons that have transverse momentum greater than 35% and 25% of the diphoton invariant mass and each with absolute pseudorapidity less than 2.37. Four additional fiducial cross sections and two cross-section limits are presented in phase space regions that test the theoretical modelling of different Higgs boson production mechanisms, or are sensitive to physics beyond the Standard Model. Differential cross sections are also presented, as a function of variables related to the diphoton kinematics and the jet activity produced in the Higgs boson events. The observed spectra are statistically limited but broadly in line with the theoretical expectations

Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at s√=8 TeV with the ATLAS detector

The results of a search for supersymmetry in final states containing at least one isolated lepton (electron or muon), jets and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. The search is based on proton-proton collision data at a centre-of-mass energy s√=8 TeV collected in 2012, corresponding to an integrated luminosity of 20 fb−1. No significant excess above the Standard Model expectation is observed. Limits are set on supersymmetric particle masses for various supersymmetric models. Depending on the model, the search excludes gluino masses up to 1.32 TeV and squark masses up to 840 GeV. Limits are also set on the parameters of a minimal universal extra dimension model, excluding a compactification radius of 1/R c = 950 GeV for a cut-off scale times radius (ΛR c) of approximately 30

Measurement of χ c1 and χ c2 production with s√ = 7 TeV pp collisions at ATLAS

The prompt and non-prompt production cross-sections for the χ c1 and χ c2 charmonium states are measured in pp collisions at s√ = 7 TeV with the ATLAS detector at the LHC using 4.5 fb−1 of integrated luminosity. The χ c states are reconstructed through the radiative decay χ c → J/ψγ (with J/ψ → μ + μ −) where photons are reconstructed from γ → e + e − conversions. The production rate of the χ c2 state relative to the χ c1 state is measured for prompt and non-prompt χ c as a function of J/ψ transverse momentum. The prompt χ c cross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χ c decays. The fractions of χ c1 and χ c2 produced in b-hadron decays are also measured