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HMI Science Nugget #4 "New Challenge to Solar Meridional Circulation Theories"
by aimee norton 03 Mar '14

03 Mar '14

New HMI Science Nuggets are available at http://hmi.stanford.edu/hminuggets, featuring the following topic #4 "SDO/HMI Observations Create New Challenge to Solar Meridional Circulation Theories" contributed by Mausumi Dikpati Solar meridional circulation, if mechanically driven and thermally braked, contains two cells in latitude; generating two cells in depth, recently observed by SDO/HMI, is a new challenge to theory. We invite those who use HMI data for their research, or whose research is closely related to HMI science objectives, to contribute to the HMI science nuggets. -- SDO/HMI team

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New HMI Nugget #5 "Comparison of sunspot properties in cycle 24 and 23"
by aimee norton 03 Mar '14

03 Mar '14

New HMI Science Nuggets are available at http://hmi.stanford.edu/hminuggetsfeaturing #5 "Comparison of sunspot properties in cycle 24 and 23" contributed by Reza Rezaei We analyze umbral area, magnetic field, and umbral intensity of the sunspots during the rising phase of cycle 24. We do not find a significant variation in either sunspot physical properties or distribution of sunspot umbral area from previous cycles. We invite those who use HMI data for their research, or whose research is closely related to HMI science objectives, to contribute to the HMI science nuggets. -- SDO/HMI team >

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New HMI Science Nugget #6 "Fickle Fields: Are Transient Magnetic Reversals Real?"
by aimee norton 03 Mar '14

03 Mar '14

New HMI Science Nuggets are available at http://hmi.stanford.edu/hminuggets, featuring the following topic #6 "Fickle Fields: Are Transient Magnetic Reversals Real?" contributed by Brian Harker We present observations from SDO/HMI of a magnetic transient observed in NOAA 11429 during the M7.9 flare on 13 March 2012. The observed transient showed an impulsive rotation of the field vector in response to the white-light flare. _________ We invite those who use HMI data for their research, or whose research is closely related to HMI science objectives, to contribute to the HMI science nuggets. -- SDO/HMI team

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New HMI Nugget #7 "Measuring the Solar Radius during the Venus Transit"
by aimee norton 03 Mar '14

03 Mar '14

New HMI Science Nuggets are available at http://hmi.stanford.edu/hminuggets, featuring the following topic #7 "Measuring the Solar Radius with HMI during the Venus Transit of 2012" contributed by Sebastien Couvidat The Venus transit of 2012 allowed us to measure the solar radius around 6173Å with HMI: we obtained a value of 959.58″ at 1 AU, with a systematic uncertainty larger than 0.27″. We invite those who use HMI data for their research, or whose research is closely related to HMI science objectives, to contribute to the HMI science nuggets. -- SDO/HMI team

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New UKSP Nugget: 44. Slipping reconnection during a solar flare
by Iain Hannah 27 Feb '14

27 Feb '14

44. Slipping reconnection during a solar flare by Jaroslav Dudík (University of Cambridge) Comparing observations with a 3D model http://www.uksolphys.org/?p=7524 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ UKSP Nuggets are published on a monthly basis highlighting solar physics research led from the UK. http://www.uksolphys.org/uksp-nuggets Iain Hannah and Lyndsay Fletcher ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Dr. Iain G. Hannah Royal Society Research Fellow, Astronomy & Astrophysics Group, SUPA School of Physics & Astronomy, Kelvin Building, University of Glasgow, Glasgow, UK, G12 8QQ Web: http://www.astro.gla.ac.uk/~iain/ Eml: iain.hannah(a)glasgow.ac.uk<mailto:iain.hannah@glasgow.ac.uk> Tel: +44 (0)141 330 6427 Fax: +44 (0)141 330 5183 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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Max Millennium News
by canfield＠mithra.physics.montana.edu 26 Feb '14

26 Feb '14

MAX MILLENNIUM NEWS 26 February 2014 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 Measurements of EUV Coronal Holes and Open Magnetic Flux -- Lowder, C., Qiu, J., Leamon, R. & Liu, Y. A model for the formation of the active region corona driven by magnetic flux emergence -- F. Chen, H. Peter, S. Bingert, M. C. M. Cheung Magnetic Helicity in Emerging Solar Active Regions -- Y. Liu, J. T. Hoeksema, M. Bobra, K. Hayashi, P. W. Schuck, X. Sun The Magnetic Field of Active Region 11158 During the 2011 February 12-17 Flares : Differences between Photospheric Extrapolation and Coronal Forward-Fitting Methods -- Aschwanden, M.J., Sun, X.D., and Liu, Y. Diagnosis of Magnetic and Electric Fields of Chromospheric Jets through Spectropolarimetric Observations of HI Paschen Lines -- Tetsu Anan, Roberto Casini, Kiyoshi Ichimoto Are There Different Populations of Flux Ropes in the Solar Wind? -- M. Janvier, P. Demoulin, S. Dasso 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar activity 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 canfield at physics.montana.edu

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Max Millennium News
by canfield＠mithra.physics.montana.edu 19 Feb '14

19 Feb '14

MAX MILLENNIUM NEWS 19 February 2014 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 Propagation and dispersion of transverse wave trains in magnetic flux tubes -- R. Oliver, M. S. Ruderman, J. Terradas Sparkling EUV Bright Dots Observed with Hi-C -- S. Regnier, C. E. Alexander, R. W. Walsh, A. R. Winebarger, J. Cirtain, L. Golub, K. E. Korreck, N. Mitchell, S. Platt, M. Weber, B. De Pontieu, A. Title, K. Kobayashi, S. Kuzin, C. E. DeForest 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar activity 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 canfield at physics.montana.edu

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Max Millennium News
by canfield＠mithra.physics.montana.edu 12 Feb '14

12 Feb '14

MAX MILLENNIUM NEWS 12 February 2014 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 Sunquakes and starquakes -- Alexander G. Kosovichev Sunquakes: helioseismic response to solar flares -- Alexander G. Kosovichev Twisted magnetic flux tubes in the solar wind -- Zaqarashvili, T.V., V"or"os, Z., Narita, Y., Bruno, R. Helioseismic Constraints and Paradigm Shift in Solar Dynamo -- Alexander G. Kosovichev, Valery V. Pipin, Junwei Zhao Solar Energetic Particles and Associated EIT Disturbances in Solar Cycle 23 -- Miteva, R., Klein, K.-L., Kienreich, I., Temmer, M., Veronig, A., Malandraki, O. E. Remote sensing of low-energy SEPs via charge exchange -- Hudson, H. S.; MacKinnon, A. L.; Badnell, N. R. Cycle 23 Variation in Solar Flare Productivity -- Hudson, Hugh; Fletcher, Lyndsay; McTiernan, Jim Charge-exchange Limits on Low-energy α-particle Fluxes in Solar Flares -- Hudson, H. S.; Fletcher, L.; MacKinnon, A. L.; Woods, T. N. 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar activity 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 canfield at physics.montana.edu

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Invitation to RHESSI Working Group - Exploring the Lower Atmospheric Response to Flare Heating
by Ryan Milligan 11 Feb '14

11 Feb '14

Dear RHESSI Colleagues, This is an invitation to submit an abstract to the working group on "Exploring the Lower Atmospheric Response to Flare Heating" at the upcoming 13th RHESSI Workshop to be held in Windisch, Switzerland from 1-4 April 2014. The scope of the working group is given below and further details can be found at: http://sprg.ssl.berkeley.edu/~solarsdy/rhessi13/index.html The deadline for registration and abstract submission is 15 February 2014. Looking forward to seeing you in Windisch! Ryan and Joel. Exploring the Lower Atmospheric Response to Flare Heating Organised by R. Milligan & J. Allred The bulk of a flare's energy released during the impulsive phase is often manifested as increased optical and UV/EUV emission emanating from lower solar atmosphere. Much can be learned about the energy release and transport processes by studying the response of the lower atmosphere to this injection of energy. For example, flow velocities, plasma densities, and emission measures can be deduced by careful analysis of the emitted radiation. This session will focus on how multi-wavelength observations of the response of the lower solar atmosphere, combined with advanced numerical simulations, can provide key insights into the processes of particle acceleration, plasma heating, energy transport, and wave propagation. Our discussion will be focused on, but not limited to, the following questions: What can we learn about these processes by combining RHESSI observations with those from other instruments, both in space (SDO, STEREO, Hinode, IRIS,...) and on the ground (ROSA, IBIS, Big Bear,...)? Where in the atmosphere and by what mechanisms are the line and continuum transitions observed by these instruments produced? More specifically, where and how is white light emission produced during flares? How does the increased photospheric/chromospheric emission compare/contrast with that of stellar flares? Are current models able to reproduce the observations? And do the measured velocities, time profiles, and emission measures match those predicted by simulations? We invite presentations of both observational and theoretical studies to this session. ================================== Leverhulme Trust Research Fellow Astrophysics Research Centre School of Mathematics and Physics Queen's University Belfast E-mail: r.milligan(a)qub.ac.uk<mailto:r.milligan@qub.ac.uk> Tel: +44-28-9097-3649 Fax: +44-28-9097-3110 Web: http://star.pst.qub.ac.uk/~rm Skype: ryanmilligan Twitter: @ryanomilligan ==================================

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Max Millennium News
by canfield＠mithra.physics.montana.edu 05 Feb '14

05 Feb '14

MAX MILLENNIUM NEWS 5 February 2014 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 MHD modeling of coronal loops: the transition region throat -- M. Guarrasi, F. Reale, S. Orlando, A. Mignone, J. A. Klimchuk Effects of enhanced stratification on equatorward dynamo wave propagation -- Petri J. Kapyla, Maarit. J. Mantere, Elizabeth Cole, Jorn Warnecke, Axel Brandenburg Sudden Photospheric Motion and Sunspot Rotation Associated with the X2.2 Flare on 2011 February 15 -- Shuo Wang, Chang Liu, Na Deng, Haimin Wang Radio Imaging of a Type IVM Radio Burst on the 14th of August 2010 -- H. M. Bain, S. Krucker, P. Saint-Hilaire, and C. L. Raftery Slipping magnetic reconnection during an X-class solar flare observed by SDO/AIA -- J. Dudik, M. Janvier, G. Aulanier, G. Del Zanna, M. Karlicky, H. Mason, B. Schmieder 2. FROM THE EDITOR ------------------ The Max Millennium program exists to enhance all aspects of solar activity 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 canfield at physics.montana.edu

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