A Peer-Led Evidence-Based Contraceptive Counseling Initiative

The experience of sexual health and wellness varies for newly independent college freshman. For reproductive-age women, gaps in knowledge and self-efficacy overlap with barriers accessing contraception and reproductive health care contributing to high-risk behavior and poor sexual health outcomes. Community-based participatory research was used to develop and implement a peer-education program targeting sorority women on a college campus in the Southeastern United States in the fall semester of 2021. Two senior nursing majors completed continuing education to be empowered as peer-educators using The University of California San Francisco Beyond the Pill framework. They engaged directly with nursing faculty stakeholders and the research team to facilitate group contraceptive counseling sessions for sixty-two of their peers, through the shared social network of their sorority. Two contraceptive counseling sessions were piloted during the 2 month intervention period. The majority of respondents answered “yes” to previously having a class that included content on sexual health and/or reproduction, although key findings highlighted a gap between knowledge and self-efficacy within this population. Sexual health content and information related to values, practical skills and communication, including negotiating safe sex and condom use, were requested by respondents. While 70% of the respondents received a prescription or method of birth control within the last year, none of the respondents were accessing their contraceptive care through university health service services. Of the 18 session participants, 10 indicated they were “extremely or somewhat likely” to make changes to their current contraceptive plan after the session content. Results identify the underutilization of student health for well-woman exams, STI screenings, and prescriptions or methods of birth control. A tremendous opportunity awaits student health services to provide evidence-based contraceptive care to a currently vulnerable and underserved population of young women

Evidence of Critical Balance in Kinetic Alfven Wave Turbulence Simulations

A numerical simulation of kinetic plasma turbulence is performed to assess the applicability of critical balance to kinetic, dissipation scale turbulence. The analysis is performed in the frequency domain to obviate complications inherent in performing a local analysis of turbulence. A theoretical model of dissipation scale critical balance is constructed and compared to simulation results, and excellent agreement is found. This result constitutes the first evidence of critical balance in a kinetic turbulence simulation and provides evidence of an anisotropic turbulence cascade extending into the dissipation range. We also perform an Eulerian frequency analysis of the simulation data and compare it to the results of a previous study of magnetohydrodynamic turbulence simulations.Comment: 10 pages, 9 figures, accepted for publication in Physics of Plasma

Validity of the Taylor Hypothesis for Linear Kinetic Waves in the Weakly Collisional Solar Wind

The interpretation of single-point spacecraft measurements of solar wind turbulence is complicated by the fact that the measurements are made in a frame of reference in relative motion with respect to the turbulent plasma. The Taylor hypothesis---that temporal fluctuations measured by a stationary probe in a rapidly flowing fluid are dominated by the advection of spatial structures in the fluid rest frame---is often assumed to simplify the analysis. But measurements of turbulence in upcoming missions, such as Solar Probe Plus, threaten to violate the Taylor hypothesis, either due to slow flow of the plasma with respect to the spacecraft or to the dispersive nature of the plasma fluctuations at small scales. Assuming that the frequency of the turbulent fluctuations is characterized by the frequency of the linear waves supported by the plasma, we evaluate the validity of the Taylor hypothesis for the linear kinetic wave modes in the weakly collisional solar wind. The analysis predicts that a dissipation range of solar wind turbulence supported by whistler waves is likely to violate the Taylor hypothesis, while one supported by kinetic Alfven waves is not.Comment: 10 pages, 3 figures, Accepted for publication in The Astrophysical Journa

Effect of a weak ion collisionality on the dynamics of kinetic electrostatic shocks

In strictly collisionless electrostatic shocks, the ion distribution function can develop discontinuities along phase-space separatrices, due to partial reflection of the ion population. In this paper, we depart from the strictly collisionless regime and present a semi-analytical model for weakly collisional kinetic shocks. The model is used to study the effect of small but finite collisionalities on electrostatic shocks, and they are found to smooth out these discontinuities into growing boundary layers. More importantly, ions diffuse into and accumulate in the previously empty regions of phase space, and, by upsetting the charge balance, lead to growing downstream oscillations of the electrostatic potential. We find that the collisional age of the shock is the more relevant measure of the collisional effects than the collisionality, where the former can become significant during the lifetime of the shock, even for weak collisionalities.Comment: Published in J. Plasma Phy