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solar radio science nuggets in April 2022
by Eduard Kontar 20 Apr '22

20 Apr '22

LOFAR size and shape measurements of solar metric radio burst sources by Gordovskyy et al https://www.astro.gla.ac.uk/users/eduard/cesra/?p=3260 Fundamental electromagnetic emissions by a weak electron beam in solar wind plasmas with density fluctuations by C. Krafft and P. Savoini https://www.astro.gla.ac.uk/users/eduard/cesra/?p=3239 --- CESRA Highlights of Solar Radio Physics, aka CESRA Nuggets, are short communications written in language accessible to a non-expert in the specific area and designed to keep solar and heliophysics communities informed and up-to-date about current research. The highlights can be followed, discussed, commented and shared via http://www.facebook.com/solarcesra/ and http://twitter.com/CESRA_community.

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TESS Topical Session on the Millimeter Chromosphere
by Kobelski, Adam R. (MSFC-ST13) 14 Apr '22

14 Apr '22

Hi All, In case you hadn’t seen it and were still debating where to submit your abstract, I wanted to remind you about session 23 before the TESS abstract deadline tomorrow: “Investigating the Solar Chromosphere at Millimeter Wavelengths”. Meeting website: https://aas.org/meetings/tess2022 If you have any science results utilizing millimeter wavelength observations, or that could benefit from millimeter wavelength observations, we encourage you to submit an abstract. Thank you, and we hope to see you in Bellevue! Adam, on behalf of the ALMA Solar Development Team 23. Title: Investigating the Solar Chromosphere at Millimeter Wavelengths Conveners: Adam Kobelski (NASA Marshall Space Flight Center), Gianna Cauzzi (National Solar Observatory) One of the most notable new developments in the study of the solar chromosphere is the ability to obtain high resolution observations of the Sun at millimeter wavelengths using the Atacama Large Millimeter Array (ALMA). This interferometric imaging array of 64 dishes, located at an altitude of 5000 meters in Chile, is currently able to observe the Sun at frequencies from 90 GHz to 370 GHz (~ 0.85 – 3.0 mm wavelengths), achieving spatial resolutions as high as 0.6”, with 1 s cadence. The millimeter continuum is emitted by electrons over much of the range from the temperature minimum to the transition region, and provides a direct measure of the local temperature. Thus, ALMA data provide important new diagnostics for studying the spatio-temporal structure and dynamics of the solar chromosphere. Over the past few years, the community has made significant progress in the processing and interpretation of this interferometric data. and numerous studies have used these data to probe various features and processes in the solar atmosphere. Within this session, we aim to introduce the community to both novel science results obtained by this new facility and to highlight future scientific opportunities enabled by ALMA, especially those in coordination with ground and spaced based instruments. We invite contributions from previous users of ALMA about their results, but also presentations of studies of the solar chromosphere that would potentially benefit from the additional temperature and magnetic field diagnostics from these millimeter observations. Two featured talks will provide a broad overview of solar ALMA science, including the potential for observations of solar activity and flares, and provide guidance for potential new users of the facility, with the goal of inspiring a broader participation in this exciting science.

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TESS session 16: next-gen missions -- call for abstracts
by Amir Caspi 13 Apr '22

13 Apr '22

Hi all, It's a bit last-minute, but I wanted to ensure that everyone knew about our TESS session #16, "High-Energy Solar Investigations Through Next-Generation Remote Sensing: Spectroscopy, Imaging, and Beyond." This is the next installment in our now long-running successful series of AGU sessions for next-gen missions, instruments, technology, and science studying high-energy processes on the Sun. Please consider submitting an abstract to the session! We welcome a broad range of topics, and especially encourage decadal concepts and long-term outlook. Abstracts are due this Friday, April 15. The session description is below, for your reference. Abstracts can be submitted at the following URL: https://submissions.mirasmart.com/TESS2022/Splash.aspx Looking forward to seeing you at TESS, in session 16! =) --- Amir, on behalf of the conveners 16. Title: High-Energy Solar Investigations Through Next-Generation Remote Sensing: Spectroscopy, Imaging, and Beyond Conveners: Amir Caspi (SwRI), Lindsay Glesener (UMN), Tom Woods (CU/LASP) Description: Energetic phenomena on the Sun, including impulsively-driven eruptions (flares and coronal mass ejections) and more gradual coronal heating and solar wind outflows, provide crucial insight into unique regimes of plasma physics and astrophysical processes, and are also the primary drivers of space weather. Physical processes within these phenomena, including particle acceleration and plasma heating, emit signatures across the electromagnetic spectrum, from Xrays/gamma-rays, through UV/EUV, to infrared and radio. Spectral and imaging observations of these emissions provide critical diagnostics into the macro- and microphysics underlying these processes. The X-ray and EUV emissions are also significantly geoeffective, contributing to societally-important dynamical effects in Earth’s upper atmosphere and ionosphere on a variety of timescales. Recent measurements from numerous solar observatories including RHESSI; SDO; SolO; MinXSS; SphinX; Chandrayaan-2; the FOXSI, MaGIXS, Hi-C, EUNIS, and EVE rockets; the GRIPS balloon; EOVSA; and many others – and from opportunistic observations by non-solar observatories such as NuSTAR, Fermi, ALMA, and VLA – have significantly advanced our understanding of these phenomena and their driving processes. They have also shown the pressing need for increasingly advanced high-resolution, high-sensitivity measurements across the entire spectrum, including polarimetry and especially imaging spectroscopy, to gain further insight into these high-energy processes and the solar magnetic field that powers them. This session invites presentations covering new instrumentation, enabling technology, missions, and concepts for next-generation solar remote sensing -- including spectroscopy, imaging, and beyond -- aimed at studying high-energy (hot and non-thermal) aspects of the Sun, as well as the solar magnetic field. Presentations are also invited on the science enabled by such new observations, including space weather-related science and impacts to Earth’s atmosphere and ionosphere. Recognizing the 2023-2032 Heliophysics Decadal Survey currently under way and the community-led Heliophysics 2050 vision, we also encourage presentations that include longer-term future outlooks and both intra- and inter-disciplinary integration of solar and heliospheric physics, space physics, and other relevant fields.

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TESS session on energy release
by Jiong Qiu 13 Apr '22

13 Apr '22

Dear colleagues, We would like to bring to your attention a topical session on "Explosive Energy Release Processes in the Solar Corona and Earth's Magnetosphere," which will take place during the Triennial Earth-Sun Summit (TESS) (https://aas.org/meetings/tess2022) in Bellevue/Seattle, WA, on 8-11 August 2022. As the title suggests, we invite contributions that facilitate an in-depth interdisciplinary discussion of the fundamental processes related to explosive energy release in both the solar corona and the magnetosphere. Studies that contrast the similarities and differences in the two environments are particularly encouraged. Possible focal topics include the roles of ideal versus resistive instability; the triggers for fast magnetic reconnection; the mechanisms of particle acceleration and plasma heating in the reconnection site, field-line shrinkage region, and elsewhere; the connections between multiscale spatiotemporal structures and dynamics. The full session description is included below. The deadline for abstract submission is April 15 (this Friday). 21. Title: Explosive Energy Release Processes in the Solar Corona and Earth's Magnetosphere Conveners: Bin Chen (NJIT), Vadim Uritsky (CUA), James Drake (UMD); Spiro Antiochos (NASA/GSFC); Joel Dahlin (NASA/GSFC); Rick DeVore (NASA/GSFC); Fan Guo (LANL); Maria Kazachenko (CU Boulder); Marit Oieroset (UC Berkeley); Jiong Qiu (MSU) Description: This session focuses on explosive energy release processes occurring in the solar corona (solar flares, coronal mass ejections, jets, etc.) and in the Earth?s magnetosphere (magnetic storms, substorms, etc.). They share the widely important process of explosive release of the previously stored magnetic energy, as well as the subsequent conversion of the magnetic energy to other forms of energy such as mass motion, accelerated particles, and heated plasma. Despite the vastly different plasma density and magnetic field strength values, the system length scales and Alfv?n speeds in the two systems are strikingly similar. In both cases, the impulsive energy release is usually followed by a fast field-line shrinkage (or dipolarization) of the reconnected field lines, forming closed magnetic field lines anchored to the surface of the Sun/Earth. Observations and models have shown that the processes of energy build-up, triggering, release, and conversion involved in both systems are highly complex and dynamic. They include a plethora of physical processes including, but not limited to, ideal/resistive instabilities, magnetic reconnection, bursty plasma flows, turbulence/waves, shocks, and magnetic islands. We invite contributions that facilitate an in-depth interdisciplinary discussion of these fundamental processes. Studies that contrast the similarities and differences in the two environments are particularly encouraged. Possible focal topics include the roles of ideal versus resistive instability; the triggers for fast magnetic reconnection; the mechanisms of particle acceleration and plasma heating in the reconnection site, field-line shrinkage region, and elsewhere; the connections between multiscale spatiotemporal structures and dynamics. Best regards, Bin Chen, Vadim Uritsky, on behalf of the session conveners

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Max Millennium News
by Keiji YOSHIMURA 13 Apr '22

13 Apr '22

MAX MILLENNIUM NEWS 13 April 2022 CONTENTS 1. E-PRINTS POSTED IN THE PAST WEEK 2. FROM THE EDITOR ===================================================================== 1. E-PRINTS POSTED IN THE PAST WEEK ----------------------------------- > http://solar.physics.montana.edu/cgi-bin/eprint/default_page.pl Eigen vectors of solar magnetic field in cycles 21-24 and their links to solar activity indices -- Zharkova V.V. and Shepherd S.J. 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar flare research. If you have news that is of broad interest to that community, feel free to send your message to the MMScience e-mail list: http://solar.physics.montana.edu/max_millennium/mmlists.shtml Address questions to keiji.yoshimura at montana.edu

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Max Millennium News
by Keiji YOSHIMURA 06 Apr '22

06 Apr '22

MAX MILLENNIUM NEWS 6 April 2022 CONTENTS 1. E-PRINTS POSTED IN THE PAST WEEK 2. FROM THE EDITOR ===================================================================== 1. E-PRINTS POSTED IN THE PAST WEEK ----------------------------------- > http://solar.physics.montana.edu/cgi-bin/eprint/default_page.pl Ambipolar diffusion: Self-similar solutions and MHD code testing. Cylindrical symmetry -- F. Moreno-Insertis, D. Nobrega-Siverio, E. R. Priest, A. W. Hood 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar flare research. If you have news that is of broad interest to that community, feel free to send your message to the MMScience e-mail list: http://solar.physics.montana.edu/max_millennium/mmlists.shtml Address questions to keiji.yoshimura at montana.edu

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Max Millennium News
by Keiji YOSHIMURA 30 Mar '22

30 Mar '22

MAX MILLENNIUM NEWS 30 March 2022 CONTENTS 1. E-PRINTS POSTED IN THE PAST WEEK 2. FROM THE EDITOR ===================================================================== 1. E-PRINTS POSTED IN THE PAST WEEK ----------------------------------- > http://solar.physics.montana.edu/cgi-bin/eprint/default_page.pl Statistical analysis of circular-ribbon flares -- Yanjie Zhang, Qingmin Zhang, Dechao Song, Shuting Li, Jun Dai, Zhe Xu, Haisheng Ji 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar flare research. If you have news that is of broad interest to that community, feel free to send your message to the MMScience e-mail list: http://solar.physics.montana.edu/max_millennium/mmlists.shtml Address questions to keiji.yoshimura at montana.edu

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Solar radio science nuggets in March 2022
by Eduard Kontar 29 Mar '22

29 Mar '22

Spectral Analysis of Solar Radio Type III Bursts from 20 kHz to 410 MHz by K. Sasikumar Raja et al.* https://www.astro.gla.ac.uk/users/eduard/cesra/?p=3221 New results from the spectral observations of solar coronal type II radio bursts by R. Ramesh et al.* https://www.astro.gla.ac.uk/users/eduard/cesra/?p=3231 CESRA Highlights of Solar Radio Physics, aka CESRA Nuggets, are short communications written in language accessible to a non-expert in the specific area and designed to keep solar and heliophysics communities informed and up-to-date about current research. The highlights can be followed, discussed, commented and shared via http://www.facebook.com/solarcesra/ and http://twitter.com/CESRA_community.

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Max Millennium News
by Keiji YOSHIMURA 23 Mar '22

23 Mar '22

MAX MILLENNIUM NEWS 23 March 2022 CONTENTS 1. E-PRINTS POSTED IN THE PAST WEEK 2. FROM THE EDITOR ===================================================================== 1. E-PRINTS POSTED IN THE PAST WEEK ----------------------------------- > http://solar.physics.montana.edu/cgi-bin/eprint/default_page.pl Nanoflare distributions over solar cycle 24 based on SDO/AIA differential emission measure observations -- Stefan Purkhart and Astrid M. Veronig The Fractality and Size Distributions of Astrophysical Self-Organized Criticality Systems -- Markus J. Aschwanden On modeling ICME cross-sections as static MHD columns -- Debesh Bhattacharjee, Prasad Subramanian, Volker Bothmer, Teresa Nieves-Chinchilla, Angelos Vourlidas SolO/EUI Observations of Ubiquitous Fine-scale Bright Dots in an Emerging Flux Region: Comparison with a Bifrost MHD Simulation -- Tiwari, Sanjiv K.; Hansteen, Viggo H.; De Pontieu, Bart; Panesar, Navdeep K.; Berghmans, David 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar flare research. If you have news that is of broad interest to that community, feel free to send your message to the MMScience e-mail list: http://solar.physics.montana.edu/max_millennium/mmlists.shtml Address questions to keiji.yoshimura at montana.edu

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Max Millennium News
by Keiji YOSHIMURA 16 Mar '22

16 Mar '22

MAX MILLENNIUM NEWS 16 March 2022 CONTENTS 1. E-PRINTS POSTED IN THE PAST WEEK 2. FROM THE EDITOR ===================================================================== 1. E-PRINTS POSTED IN THE PAST WEEK ----------------------------------- > http://solar.physics.montana.edu/cgi-bin/eprint/default_page.pl Magnetic Winding as an Indicator of Flare Activity in Solar Active Regions -- Raphaldini, B., Prior, C., MacTaggart, D. Helicity shedding by flux rope ejection -- Kliem, B., and Seehafer, N. 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar flare research. If you have news that is of broad interest to that community, feel free to send your message to the MMScience e-mail list: http://solar.physics.montana.edu/max_millennium/mmlists.shtml Address questions to keiji.yoshimura at montana.edu

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