Index of /~sylvain/research/tables

[ICO]NameLast modifiedSizeDescription
[DIR]Parent Directory  -  
[DIR]HiL/10-Oct-2016 23:04 -  
[DIR]MediumL/22-Mar-2024 10:48 -  

Content

Tables of mode frequencies, line-widths, asymmetries and amplitudes, resulting from my fitting are available here.
Using the same format as the standard JSOC tables, a subset has also been ingested in the JSOC2 (i.e., the password protected JSOC).
  • MediumL/ holds results from fitting MDI, GONG and HMI at low and intermediate degrees: 0 ≤ ℓ ≤ 200 | 300 (resolved modes), using all the GONG (up to ℓ=200), MDI and HMI (up to ℓ=300) data available to date.

  • HiL/ holds results from fitting MDI, GONG and HMI at high degrees: 100 ≤ ℓ ≤ 900 | 1000 (derived from ridge fitting), for selected time series.

Most Recent Releases

Mar 2024, Medium-L

The files in MediumL hold tables of mode frequencies, line-widths, asymmetries and amplitudes, resulting from fitting individual modes for 0 ≤ l ≤ 200|300 using MDI, GONG and HMI observations.

All the tables have been updated as follows, and ingested in the JSOC:

  • Mar 21 2024
    • More GONG tables for 36d, 01e, 01e.sym, 02e, 04e & 08e (Mar 12),
    • More HMI tables for 36d, 01e, 01e.sym, 02e, 04e, 05e, 05e.sym & 08e,
    • See the list of available tables.
     
  • Jan 19 2024
    • More GONG tables for 36d, 01e, 01e.sym, 02e & 04e,
      note that the most recent GONG data has poor duty cycle due to lack of data from multiple stations.
    • NEW: tables resulting from fitting 10e, or 720-day long time-series,
      all the available data (GONG, MDI & HMI) have been fitted for 10e time-series.
     
  • Dec 6 2023
    • More HMI tables for 36d, 01e, 01e.sym & 02e.
     
  • May 3, 2023
    • More HMI and GONG tables for 32x.
     
  • Apr 12, 2023
    • More GONG tables for 36d, 01e, 01e.sym, 02e & 04e.
    • More HMI tables for 36d, 01e, 01e.sym, 02e, 04e, 05e, 05e.sym, 08e & 16e.
     
  • Jan 4, 2023
    • More GONG tables: 128e, i.e., 128x 72-day = 9,216-day long fit, for 5 leakage matrices and using an asymmetric mode profile, and 1 leakage matrix when using a symmetric mode profile.
      See "Precision and systematic errors in global helioseismology mode fitting and inversions: Leveraging some 25 years of nearly uninterrupted observations", by S.G. Korzennik, published in Frontiers in Astronomy and Space Sciences (DOI: 10.3389/fspas.2022.1031313).
     
  • All the tables have been re-processed using version 7 (v7.x) of the procedure that converts singlets (νn,ℓ,m) to multiplets (νn,ℓ) and expansion coefficients.
    • The actual fitting of individual modes was not redone or changed. Only the computation of the expansion coefficients was updated, the latest version does a much better rejection of outliers than v6.x.
     
  • The tables of coefficients for expansion in m are available for 6, 9, 18 or 36 coefficients and for two normalizations: Ritzwoller & Lavely 1991 or Schou et al. 2002.
     
  • The tables include ℓ=0 modes, as well as more ℓ=1 modes than before.
     
  • The website was reorganized with better (unique) file names and more subdirectories.
     
  • Time series of various lengths have been fitted, starting with 36-, 72- and 360-day long abutting time series and with lenghs increasing in a factor two progression, namely time series that are 144-, 288-, ..., up to 128x 72-day long ones, with a 50% overlap in time whenever possible.
     
  • All the tables have been converted to the Stanford format and ingested into the password protected JSOC (aka JSOC2) using Schou's m10qr file format for compatibility. These are su_sylvain data series.
     

March 2013, High-L

The files in HiL hold tables of mode frequencies, line-widths, asymmetries and amplitudes, resulting from fitting full-disk observations, for 100 ≤ l ≤ 900|1000 resulting from ridge fitting, corrected to produce mode estimates.

Observations from all three instruments (MDI, GONG and HMI) for three Dynamics epochs were analyzed:

InstrumentYear (length, days)
MDI 2001 (90d) 2002 (98d) 2010 (67d)
GONG 2002 (98d) 2010 (67d)
HMI 2010 (67d)

The exact same epochs were fitted for each instrument for each year, as determined by MDI's full-disk images availability, only the fill factor is different.
 

Sylvain G. Korzennik  (skorzennik@cfa.harvard.edu)
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Last modified: Wednesday, 06-Dec-2023 11:27:46 EST