Title: SOHO-23: Understanding a Peculiar Solar Minimum
Volume: 428 Year: 2010 View Volume 428 on ADS
Editors: Cranmer, Steven R.; Hoeksema, J. Todd; Kohl, John L.

These are the proceedings of the twenty-third in the series of international workshops associated with the Solar and Heliospheric Observatory (SOHO) mission. This workshop brought together more than 95 scientists with a broad range of interests and expertise to focus on the topic of the unusual minimum of the Sun's activity cycle that persisted in 2007, 2008, and 2009. The meeting attempted to arrive at a better understanding of why this minimum appeared to differ from other solar minima observed during the space age, and it also explored similarities and differences with minima from earlier periods. The issue of whether or not the Sun is entering a new "grand minimum" of activity (comparable to the historical Dalton and Maunder minima) was a topic of vivid discussion.

The SOHO-23 workshop addressed the following topics:
(1) the role of the solar interior in determining solar minimum characteristics, (2) manifestations of the unusual solar minimum in the photosphere and chromosphere, (3) the time-variable corona and the current solar minimum, (4) how the solar wind transmits the unique properties of solar minimum to the heliosphere, and (5) solar cycle history and prediction. There were 20 invited review talks, 28 contributed talks, and 44 poster papers presented on these topics.

This book is of interest for researchers and graduate students interested in solar physics and related fields such as astrophysics, space plasma physics, and laboratory plasma physics.

ISBN: 978-1-58381-736-0 eISBN: 978-1-58381-737-7
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Paper Title Page Authors
Front matter   
Cover Cranmer, Steven R.; Hoeksema, J. Todd; Kohl, John L.
Front matter 1 Cranmer, Steven R.; Hoeksema, J. Todd; Kohl, John L.
Part I. Overviews   
What’s So Peculiar about the Cycle 23/24 Solar Minimum? 3 Sheeley, N. R., Jr.
The Role of Harvard College Observatory and UVCS in the Development of SOHO 15 Huber, M. C. E.
Part II. Role of the Solar Interior in Determining Solar Minimum Characteristics   
Helioseismology over the Solar Cycle 23 Thompson, M. J.
The Dynamo Dialectic: An Inside Look at the Current Solar Minimum 29 Miesch, M. S.
Differences Between the Current Solar Minimum and Earlier Minima 37 Basu, S.; Broomhall, A.-M.; Chaplin, W. J.; Elsworth, Y.; Fletcher, S.; New, R.
The New Solar Minimum: How Deep does the Problem Go? 43 Fletcher, S.; New, R.Broomhall, A.-M.; Chaplin, W.; Elsworth, Y.
Frequency Shifts of the Individual Low-Degree P-Modes during Solar Cycle 23 and its Extended Minimum 51 Salabert, D.; García, R. A.; Pallé, P. L.; Jiménez-Reyes, S. J.
What Solar Oscillation Tell Us About the Solar Minimum 57 Jain, K.; Tripathy, S. C.; Burtseva, O.; Hernández, I. G.; Hill, F.; Howe, R.; Kholikov, S.; Komm, R.; Leibacher, J.
Part III. Manifestations of the Unusual Solar Minimum in the Photosphere and Chromosphere   
Irradiance Variations during This Solar Cycle Minimum 63 Woods, T. N.
Minima of Solar Cycles 22/23 and 23/24 as Seen in SOHO/CELIAS/SEM Absolute Solar EUV Flux 73 Didkovsky, L. V.; Judge, D. L.; Wieman, S. R.; McMullin, D.
Hydrogen Lyman Emission through the Solar Cycle 81 Curdt, W.; Tian, H.
Is There Such a Thing as Quiet Sun? 87 Rast, M. P.
Did Recent Large-Scale Evolution of the Magnetic Field Presage the Unusual Current Minimum? 93 Benevolenskaya, E. E.
Turbulent Magnetic Fields in the Quiet Sun: A Search for Cyclic Variations 103 Kleint, L.; Berdyugina, S. V.; Shapiro, A. I.; Bianda, M.
Three Cycles of the Solar Toroidal Magnetic Field and This Peculiar Minimum 109 Lo, L.; Hoeksema, J. T.; Scherrer, P. H.
Zeeman Component Decomposition (ZCD) of Polarized Spectra: Application for the Quiet Sun Internetwork Magnetic Field 113 Sennhauser, C.; Berdyugina, S. V.
Sunspot Umbra Atmosphere from Full Stokes Inversion 117 Wenzel, R.; Berdyugina, S. V.; Fluri, D. M.; Arnaud, J.; Sainz-Dalda, A.
Magnetic Fields and Hα Filament Formation during Solar Minimum 123 Panasenco, O.; Pevtsov, A.
Photospheric Manifestations of Supergranules during the Last Two Solar Minima 127 Williams, P. E.; Pesnell, W. D.
The Signature of Flares in VIRGO Total Solar Irradiance Measurements 133 Quesnel, A.; Dennis, B. R.; Fleck, B.; Fröhlich, C.; Hudson, H. S.; Tolbert, A. K.
Part IV. The Time-Variable Corona and the Current Solar Minimum   
Large Scale Properties of Coronal Heating along the Solar Cycle 139 Peres, G.; Argiroffi, C.; Orlando, S.; Reale, F.
The Progress of Solar Cycle 24 at High Latitudes 147 Altrock, R. C.
Flare and CME Properties and Rates at Sunspot Minimum 153 Hudson, H. S.; Li, Y.
Statistical Properties of Flares and Sunspots over the Solar Cycle 161 Temmer, M.
Historical Eclipses and the Recent Solar Minimum Corona 171 Judge, P. G.; Burkepile, J.; de Toma, G.; Druckmüller, M.
Properties of the Reconnecting Current Sheets in CME/Flare Events 177 Lin, J.; Li, J.; Ko, Y.-K.; Raymond, J. C.
Studies of Wave-Like Phenomena Caused by the Catastrophe and the Consequences 181 Lin, J.; Shen, C.; Wang, H.
Time Evolution of a Coronal Velocity Source Surface during Solar Cycle 23 187 Strachan, L.; Panasyuk, A. V.; Kohl, J. L.
Variations in the Absolute Ultraviolet Intensities of Polar Coronal Holes 191 Gardner, L. D.; Kohl, J. L.; Cranmer, S. R.; Lin, M.; Panasyuk, A. V.; Uzzo, M.
Ion Temperatures in the Low Solar Corona: Polar Coronal Holes at Solar Minimum 197 Landi, E.; Cranmer, S. R.
Physical Conditions in a CME from Hinode, STEREO, and SOHO Observations 201 Landi, E.; Raymond, J. C.; Miralles, M. P.; Hara, H.
Part V. How does the Solar Wind Transmit the Unique Properties of Solar Minimum out to the Heliosphere?   
Extended Coronal Heating and Solar Wind Acceleration over the Solar Cycle 209 Cranmer, S. R.; Kohl, J. L.; Miralles, M. P.; van Ballegooijen, A. A.
The Minimum Between Cycle 23 and 24: Is Sunspot Number the Whole Story? 217 de Toma, G.; Gibson, S. E.; Emery, B. A.; Arge, C. N.
The Whole Heliosphere Interval in the Context of the Current Solar Minimum 223 Gibson, S. E.; Webb, D. F.; Thompson, B. J.
Comparison of Two Solar Minima: Narrower Streamer Stalk Region and Conserved Open Magnetic Flux in the Region Outside of Streamer Stalks 229 Zhao, L.; Fisk, L.
The Tale of Two Minima and a Solar Cycle in Between: An Ongoing Fast Solar Wind Investigation 237 Miralles, M. P.; Cranmer, S. R.; Panasyuk, A. V.; Uzzo, M.
How are the Present Solar Minimum Conditions Transmitted to the Outer Heliosphere and Heliosheath? 245 Richardson, J. D.
The Solar Wind as Seen by SOHO/SWAN Since 1996: Comparison with SOHO/LASCO C2 Coronal Densities 253 Lallement, R.; Quémerais, E.; Lamy, P.; Bertaux, J.-L.; Ferron, S.; Schmidt, W.
Solar Energetic Particle Events through the Current Solar Cycle Minimum 259 Kahler, S. W.
Proton Heating Rate in Polar Winds at Solar Minima 269 Vasquez, B. J.; Smith, C. W.; Stawarz, J. E.
Solar Wind Characteristics during the Current Solar Minimum (2007–2009): STEREO PLASTIC Observations 275 Galvin, A. B.; Popecki, M.; Simunac, K.; Kistler, L.; Ellis, L.; Farrugia, C.
Impact of Coronal Mass Ejections, Interchange Reconnection, and Disconnection on Heliospheric Magnetic Field Strength 279 Crooker, N. U.; Owens, M. J.
Part VI. Solar Cycle History and Prediction   
Past and Future Solar Activity from Cosmogenic Radionuclides 287 Abreu, J. A.; Beer, J.; Ferriz-Mas, A.
Updating the Historical Sunspot Record 297 Svalgaard, L.
Does the Current Minimum Validate (or Invalidate) Cycle Prediction Methods? 307 Hathaway, D. H.
Comparing Estimates of the Mg II Index at Solar Minimum from 1961 through 1981 with the Observed Mg II Index from 1978 to Present 315 Morrill, J. S.; Floyd, L.; McMullin, D.; Snow, M.; Viereck, R.
Modeling the Slow Solar Wind during the Solar Minimum 321 Ofman, L.; Kramar, M.
The Solar Microwave Flux and the Sunspot Number 325 Svalgaard, L.; Hudson, H. S.
Ground-Level Enhanced (GLE) Solar Particle Events at Solar Minimum 329 Tylka, A. J.; Dietrich, W. F.
Author Index 335 Cranmer, Steven R.; Hoeksema, J. Todd; Kohl, John L.
Back Matter 337 Cranmer, Steven R.; Hoeksema, J. Todd; Kohl, John L.