Bulletin of the American Physical Society
Mid-Atlantic Section Fall Meeting 2020
Volume 65, Number 20
Friday–Sunday, December 4–6, 2020; Virtual
Session E03: Solar Activity |
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Chair: Bin Chen, NJIT |
Saturday, December 5, 2020 11:30AM - 12:06PM |
E03.00001: Answering the Outstanding Questions of Solar Wind Physics Invited Speaker: Nicholeen Viall We present our recent paper, Nine Outstanding Questions of Solar Wind Physics, which is a part of the Grand Challenges in Earth and Space Sciences series of the Journal of Geophysical Research. These questions synthesize input from the Heliophysics community and involve the formation of the solar wind, the inherent properties of the solar wind, and the evolution of the solar wind. The nine questions focus on (1) origin locations on the Sun, (2) plasma release, (3) acceleration, (4) heavy-ion abundances and charge states, (5) magnetic structure, (6) Alfven waves, (7) turbulence, (8) distribution-function evolution, and (9) energetic-particle transport. We discuss the current state of research in the field of solar wind physics, an updated framework for discussing solar wind formation, as well as future needs and opportunities for progress. [Preview Abstract] |
Saturday, December 5, 2020 12:06PM - 12:42PM |
E03.00002: Pulsations and oscillatory signatures in solar flares -- a unique probe of fundamental flare processes Invited Speaker: Laura Hayes Solar flares are the most powerful and energetic physical phenomena in our solar system, releasing radiation across the entire electromagnetic spectrum with total energies reaching on the order of 10$^{\mathrm{25}}$ J in a matter of minutes. A key observational feature of the emission generated in solar flares is the presence of pronounced pulsations and oscillatory signatures known as quasi-periodic pulsations. Despite decades of research into the phenomena, the true nature and underpinning mechanisms causing the oscillatory signatures remains poorly understood. The occurrence of such pulsations in flaring emission places additional constraints on the interpretation and processes that operate in solar flares, and hence a full description of the phenomena is required to build towards an integrated solar flare model. In this talk I will present an overview of quasi-periodic pulsations that exists in solar flare emission and discuss a recent statistical study of quasi-periodic pulsations observed in the X-ray emission from flares over the last solar cycle, placing the results in the context of proposed mechanisms. [Preview Abstract] |
Saturday, December 5, 2020 12:42PM - 1:18PM |
E03.00003: Understanding the Flaring Solar Chromosphere Invited Speaker: Graham Kerr Solar flares are transient yet dramatic energy release events occurring in the solar atmosphere, representing extreme examples of various plasma physics phenomenon. They are also major drivers of space weather. Here I focus on the response of the solar chromosphere to flare energy injection. The chromosphere is the primary energy deposition site, and consequently the origin of the bulk the flare's radiated energy. Confronting state-of-the-art models of the chromosphere's response with observations is key if we wish to interrogate our understanding of flare energy transport mechanisms. I will describe how we can use state-of-the-art field-aligned radiation hydrodynamics flare simulations to forward model chromospheric radiation, and how we can use those simulations to both help interpret observations, and to challenge our theories. I will focus on two specific observables that have the potential to pose strong constraints on flare energy transport models: the white light continuum, and the He I 10830 line. Both of these observations present subtle yet powerful diagnostics of the flaring plasma. [Preview Abstract] |
Saturday, December 5, 2020 1:18PM - 1:30PM |
E03.00004: Modeling of sunspot oscillations observed in AR12470 by ALMA and GST Yi Chai Waves and oscillations are considered as an important candidate for solving the coronal heating problem, therefore numerous efforts have been made in both observation and modeling during decades. Using the joint observation data taken on December 17, 2015 from Atacama Large Millimeter/submillimeter Array (ALMA) as well as Goode Solar Telescope (GST) at the Big Bear Solar Observatory, we discovered clear 3-minute oscillations with a stable phase difference between ALMA band 3 and GST H alpha sub bands. We use a dynamic model by Chae and Goode (2015) to obtain a 1-D model of the disturbed chromosphere and input this into the RH code to synthesize the 1-D chromospheric H alpha emission. We report on the comparison of the simulated H-alpha behavior with the observations, which show doppler shifts that broadly agree with the model. We then use the temperature enhancements from the model to compare with the ALMA brightness temperature variations, with promising results. Details and further discussion will be presented in the talk. [Preview Abstract] |
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