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Advancements in Solar Physics: Insights from the Nobeyama Radioheliograph Symposiums

This document outlines significant symposiums centered around solar physics and observations conducted with the Nobeyama Radioheliograph (NoRH). Key events include the 1990 introduction of NoRH, followed by discussions in 1994, 1998, and 2004. These gatherings focused on advanced observations of coronal dynamics, particle acceleration mechanisms in solar flares, and the implications of MHD theories on current solar findings. It highlights the open data policy, international collaboration, and a call for publications to enhance our understanding of solar phenomena.

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Advancements in Solar Physics: Insights from the Nobeyama Radioheliograph Symposiums

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  1. NBYM04 Introduction • “Symposium on Nobeyama Radioheliograph” • 1990 November 26-28 @ NRO • “Kofu symposium – New look at the Sun with emphasis on advanced Observations of coronal dynamics and flares” • 1994 September 6-10 @ Kofu • “Solar physics with radio observations” • 1998 October 27 – 30 @ Kiyosato • “Solar physics with the Nobeyama Radioheliograph” － 2004 October 26 – 29 @ Kiyosato

  2. Nobeyama Radioheliograph • Proposal: early 1980s (Prof. Haruo Tanaka, 1985) • Reorganization: NAOJ (1988) Merger of Toyokawa and Nobeyama groups • Construction: 1990 – 1991 (Prof. Keizo Kai, 1991) • YOHKOH launched 1991 August • Routine observation 1992 June/July • Dual frequency 1995 • Another reorganization NSRO/NAO/NINS(2004)

  3. Main target • Particle acceleration mechanisms in solar flares? • No answer yet • Existing MHD solar flare theory does not include particle acceleration • Observed features do not fit to the existing theory • Two- or multi-loop configuration • Non-thermal loop (no evaporation from footpoints) • Flare associated oscillations

  4. Flare geometry found by NoRH

  5. Nonthermal electron injection(filling process of nonthermal loop with light speed) Earth size

  6. Non-thermal and thermal loop

  7. Other subjects • Eruptions • Uniform coverage for a long time (weather, good maintenance, one solar cycle), continuum emission, and high cadence • Active regions • Umbral oscillation (solar cycle dependence) • Magnetic field measurements • Quiet sun • Polar brightening, dark filaments/prominences (solar cycle dependence)

  8. Proposal of a new solar flare scenario • NoRH event on 1993 January 2 movie • Two (multiple) loop configuration, non-thermal loop • Ballooning/Flute instability (interchange instability) • Finite(high) beta plasma in a curved magnetic field • Thermal(confined) / flow plasma energy is the energy source for solar flares • Turbulence (power law energy distribution and power law distribution of power spectra of microwave light curves.)

  9. Power law energy distribution N(E)dE = A E-δdE　 log (N) log (E)

  10. A new flare model/scenario Plasma turbulence Plasma/particle Ballooning instability (interchange instability)

  11. International user group • Open data policy • INTERNET development • All the data since the beginning are online • Event lists, event images (Yokoyama) • Ejection lists, images (Shimojo) • NoRH software/SSW and analysis manuals (Yokoyama et al.) • Data analysis opportunities (CDAW like) • Invitation of international users to Nobeyama

  12. Publications • Refereed journals: 120 papers • Proceedings: 194 papers • More publications in refereed journals

  13. Proceedings of this symposium • Electronic files on CD-ROM • Proceedings book (review reports) • Special issue for NoRH: Publication of Astronomical Society of Japan (original contributions+one invited review paper) • We encourage you to submit original papers including NoRH data to PASJ special issue.

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