New Flare List: Combining GOES-Halpha-NAR

27 Aug

I have just released a new combined flare list from several data sources:
http://lmsal.com/~higgins/combined_flare_list/combine_goesxray_halpha_flare_lists.csv

This code was used to construct it:
https://raw.githubusercontent.com/pohuigin/sympathetic_eruptions/master/combine_goesxray_halpha_flare_lists.pro

The constituent flare lists (GOES X-ray and Halpha) were obtained from http://hec.helio-vo.eu/hec/hec_gui.php and the AR list was obtained from SSWIDL (‘rd_nar()’)

This combines the standard GOES flare list that is distributed from NGDC with the Halpha list from the same site, with the NOAA AR list, available from SWPC. The list uses GOES flares as a base for timing, and first collates them with the Halpha flares. Sometimes GOES flares are detected, but no location is listed, while a corresponding flare in the Halpha list exists and has a location.

After the connections between GOES and Halpha flares are established, the connections between the NOAA AR list and the GOES list are made (used rd_nar() in SSWIDL). From time to time GOES flares are associated with a NOAA number, but no location is listed. The NOAA AR locations for a given day are used; they are rotated to the flare time and recorded in the list.

Recommended use of the flare list is to take use the GOES peak times and the Lat and Lon values that are NE 1000.

The columns in the list are:
GST= GOES flare start time
GPK= GOES flare peak time
GEN= GOES flare end time
HST= Halpha flare start time (-1 if blank)
HPK= Halpha flare peak time (-1 if blank)
HEN= Halpha flare end time (-1 if blank)
GCLASS= GOES Flare Class
HCLASS= Halpha Flare Class (ignore this… always blank)
GNOAA= Associated NOAA number listed in GOES event list for given flare (0 if blank)
HNOAA= Associated NOAA number listed in Halpha event list for given flare (0 if blank)
LAT= Recorded HG Latitude for flare (1000 if blank)
LON= Recorded HG Longitude for flare (1000 if blank)
HALPHAMATCH= 1 (-1) if (no) GOES-Halpha flare match was made; 0 if GOES flare list already contained a location
NARMATCH= 1 (-1) if (no) GOES-NOAA list match was made

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SMART V1 Detection Masks and Magnetic Property Calalog Release

30 Aug

SMART is a magnetic feature detection algorithm that was originally developed in the Astrophysics Research Group at Trinity College Dublin, Ireland. The code run described below is tuned to SOHO/MDI line-of-sight magnetograms.
Version 1 (SMARTv1) of the code is described in Higgins et al. (2011).

SMARTv1 has been used in a number of studies:
Higgins et al. (2013; in prep)
Higgins (2013; PhD thesis)
Ahmed et al. (2013)
Verbeeck et al. (2013)

The SMARTv1 code will be made available on BitBucket soon.
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Data Release
The catalog of magnetic feature detections for 1996-2011 is available here.
The set of detection masks for each year are available from the following links:
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
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Data Use Policy
These data are released under the Creative Commons license. Scientific usage of the data described above is permitted as long as a citation to Higgins et al. (2011) and an acknowledgement to Higgins for providing the data is included. Preferably, a footnote with a link to this post should be included with the citation to inform readers about the data set.

Suggested acknowledgement: “The authors acknowledge Paul A. Higgins (TCD/LMSAL) for providing the SMART feature detections used in this work.”

Creative Commons License
SMARTv1 Detections and Magnetic Properties by Paul A. Higgins is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.

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SMART V2 Detection Masks Release

28 Aug

SMART is a magnetic feature detection algorithm that was originally developed in the Astrophysics Research Group at Trinity College Dublin, Ireland. The code run described below is tuned to SOHO/MDI line-of-sight magnetograms. Version 1 (SMARTv1; see previous data release) of the code is described in Higgins et al. (2011). The SMART code described in this paper has been augmented in version 2 (SMARTv2; used here) in two ways for this release:

  • 1. Only one magnetogram is used to create each detection mask. Previously, two magnetograms (subsequent in time) were used.
  • 2. A smoothed-thresholded mask is region grown using a dilated-unsmoothed-thresholded mask to create the final detection mask. Previously, the smoothed-thresholded mask was dilated to create the final detection mask.

The SMARTv2 code is available on GitHub.
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Data Release

Detection image for 2013-Oct-28 01:35 UT.

SMARTv2 Detection image for 2013-Oct-28 01:35 UT.

The SMARTv2 feature detection masks for the whole MDI mission are now available. These data include every available MDI LOS magnetogram. Therefore, both 1min and 5min images are included. Selected parameters, including averaging time (INTERVAL), of the MDI fits files are included in file #2 (linked below).

These data have not been filtered. Every available MDI FITS file was run through the detection code. To remove ‘bad data’ (e.g., MDI images taken during a roll of the spacecraft, images taken during a proton storm, or images with missing blocks) from the set, file #2 (linked below) should be used to determine which files are reliable and which are not. I intend to develop a routine which could be run on file #2 to determine which data to remove, but if anyone else is interested in contributing this code, please get in contact!
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Available Files
Currently, the data are hosted at LMSAL.

  • 1. The parameter file corresponding to this run of the code is available here.
  • 2. A list of the MDI FITS files used, with selected header keywords is available here.
  • 3. A list of each AR detection in every MDI FITS file used, and its location/bounding box information is available here.
  • 4. A TAR file of the detection masks in FITS format (~700 Mb) is available here.
  • 5. Another TAR file of the PNG images for each set of detections for a given MDI FITS file (as in above image) is available (~43 Gb). Given the large size of this file, it cannot be hosted presently. Contact me (pohuiginATgmailDOTcom) if you would like to obtain the PNG set so that a data transfer can be organised.

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Data Use Policy
These data are released under the Creative Commons license. Scientific usage of the data described above is permitted as long as a citation to Higgins et al. (2011) and an acknowledgement to Higgins for providing the data is included. Preferably, a footnote with a link to this post should be included with the citation to inform readers about SMARTv2.

Suggested acknowledgement: “The authors acknowledge Paul A. Higgins (TCD/LMSAL) for providing the SMART feature detections used in this work.”

Creative Commons License
SMARTv2 Detections for Solar Cycle 23 by Paul A. Higgins is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.

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Flaring Active Region / Evolution Literature

6 Dec

Welsch, B. T.; Christe, S.; McTiernan, J. M. – 2011
Photospheric Magnetic Evolution in the WHI Active Regions
http://arxiv.org/pdf/1103.2396v2.pdf

Schmieder, Brigitte; Mandrini, Cristina; Chandra, Ramesh; Démoulin, Pascal; Török, Tibor; Pariat, Etienne; Uddin, Wahab – 2011
Solar activity due to magnetic complexity of active regions
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8360177

http://onlinelibrary.wiley.com/doi/10.1002/asna.200510485/pdf

http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1996JKAS…29….9L&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf

http://link.springer.com/article/10.1134%2FS106377290812007X

http://www.sciencedirect.com/science/article/pii/S0273117707007405

http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2008ASPC..383….1A&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf

http://www.ias.ac.in/jaa/junsep2006/JAA23.pdf

http://www.sciencedirect.com/science/article/pii/S0273117705009105

http://www.sciencedirect.com/science/article/pii/S0273117705009105

http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2005HiA….13..138I&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf

Active Region Helicity and Flaring

http://arxiv.org/abs/1012.0120

Evolution of Magnetic Field Twist and Tilt in Active Region NOAA 10930
B. Ravindra, P. Venkatakrishnan and Sanjiv Kumar Tiwari
http://arxiv.org/pdf/1012.0120v1.pdf

Time Evolution of Coronal Magnetic Helicity in the Flaring Active Region NOAA 10930
Sung-Hong Park, Jongchul Chae, Ju Jing, Changyi Tan, Haimin Wang
http://arxiv.org/abs/1008.1558

Productivity of Solar Flares and Magnetic Helicity Injection in Active Regions
Sung-Hong Park, Jongchul Chae, Haimin Wang
http://arxiv.org/abs/1005.3416

SURVEY OF MAGNETIC HELICITY INJECTION IN REGIONS PRODUCING X-CLASS FLARES
B. J. LaBonte, M. K. Georgoulis, and D. M. Rust
http://iopscience.iop.org/0004-637X/671/1/955/pdf/63496.web.pdf

Evolutionary Characteristics of Magnetic Helicity Injection in Active Regions
Hyewon Jeong and Jongchul Chae
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2007ASPC..369..167J&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf

Multiwavelength study of a Solar Eruption from AR NOAA 11112 I. Flux Emergence, Sunspot Rotation and Triggering of a Solar Flare
Pankaj Kumar, Sung-Hong Park, K.-S. Cho, S.-C. Bong
http://arxiv.org/abs/1210.3413

On the injection of helicity by shearing motion of fluxes in relation to Flares and CMEs
P. Vemareddy, A. Ambastha, R. A. Maurya, J. Chae
http://arxiv.org/abs/1202.5195

Convection Literature

8 Oct

Here are some interesting bits from a variety of papers on subsurface modeling and measurements of convection, including supergranulation.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009LRSP….6….2N&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Solar Surface Convection
Nordlund, Åke; Stein, Robert F.; Asplund, Martin


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ApJ…673..557M&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Structure and Evolution of Giant Cells in Global Models of Solar Convection
Miesch, Mark S.; Brun, Allan Sacha; De Rosa, Marc L.; Toomre, Juri


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005LRSP….2….6G&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Local Helioseismology
Gizon, Laurent; Birch, Aaron C.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ApJ…659..848Z&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Validation of Time-Distance Helioseismology by Use of Realistic Simulations of Solar Convection
Zhao, Junwei; Georgobiani, Dali; Kosovichev, Alexander G.; Benson, David; Stein, Robert F.; Nordlund, Åke


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ApJ…698.1749H&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Subsurface Circulations within Active Regions
Hindman, Bradley W.; Haber, Deborah A.; Toomre, Juri


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ApJ…657.1157G&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Local Helioseismology and Correlation Tracking Analysis of Surface Structures in Realistic Simulations of Solar Convection
Georgobiani, Dali; Zhao, Junwei; Kosovichev, Alexander G.; Benson, David; Stein, Robert F.; Nordlund, Åke


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008SoPh..251..241G&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Observation and Modeling of the Solar-Cycle Variation of the Meridional Flow
Gizon, Laurent; Rempel, Matthias


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008SoPh..251..381J&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
High-Resolution Mapping of Flows in the Solar Interior: Fully Consistent OLA Inversion of Helioseismic Travel Times
Jackiewicz, J.; Gizon, L.; Birch, A. C.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ApJ…749L..13H&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Supergranules as Probes of Solar Convection Zone Dynamics
Hathaway, David H.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ESASP.517..417Z&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
On the inference of supergranular flows by time-distance helioseismology
Zhao, Junwei; Kosovichev, Alexander G.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ASPC..416..421S&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Supergranulation-Scale Convection Simulations
Stein, R. F.; Nordlund, Å.; Georgoviani, D.; Benson, D.; Schaffenberger, W.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ASPC..354…92B&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Supergranulation Scale Convection Simulations
Benson, D.; Stein, R.; Nordlund, Å.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ApJ…668.1189W&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Probing Supergranular Flow in the Solar Interior
Woodard, M. F.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008SoPh..251..417H&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
Structure and Evolution of Supergranulation from Local Helioseismology
Hirzberger, Johann; Gizon, Laurent; Solanki, Sami K.; Duvall, Thomas L.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009A%26A…505.1265W&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
A method for the treatment of supergranulation advection by giant cells
Williams, P. E.; Cuntz, M.


http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ApJ…725L..47D&db_key=AST&link_type=ABSTRACT&high=4ec98647c728522
The Vertical Component of the Supergranular Motion
Duvall, T. L., Jr.; Birch, A. C.


UPDATE 2012-10-25


http://iopscience.iop.org/0004-637X/581/2/1356/pdf/56007.web.pdf
SOLAR MULTISCALE CONVECTION AND ROTATION GRADIENTS STUDIED IN
SHALLOW SPHERICAL SHELLS
Marc L. DeRosa, Peter A. Gilman, Juri Toomre


I <3 Space

19 Sep

Hopefully I will be good and update this blog in a timely manner about my research activities, out-reach / educational projects, space news, open-science activism, and personal science-themed hobbies, and so forth.

Currently I am finishing up my physics PhD at Trinity College Dublin in Ireland on solar activity and the global magnetic field of the Sun.

My trinity webpage: http://www.tcd.ie/Physics/Astrophysics/higgins.php
-remind me to update this…