Skip to main content
SpringerLink
Log in

Initial Results from Fitting \(p\)-Modes Using Intensity Observations from the Helioseismic and Magnetic Imager

  • Published:
Solar Physics Aims and scope Submit manuscript

Abstract

The Helioseismic and Magnetic Imager project recently started processing the continuum-intensity images following global helioseismology procedures similar to those used to process the velocity images. The spatial decomposition of these images has produced time series of spherical harmonic coefficients for degrees up to \(\ell=300\), using a different apodization than the one used for velocity observations. The first 360 days of observations were processed and are made available. I present initial results from fitting these time series using my fitting method and compare the derived mode characteristics to those estimated using coeval velocity observations.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21

Similar content being viewed by others

Notes

  1. A leakage matrix is the characterization of the spatial leaks, i.e. the relative amplitude of the signal from adjacent \(\ell\) and \(m\) in any target (\(\ell, m\)) spherical harmonic coefficient, which results from the fact that one can only observe the visible fraction of the Sun while the spherical harmonic functions are orthonormal on the complete sphere.

  2. For 72-day long time series, the number of tapers is between 3 and 33 (i.e. 3, 5, 9, 17, or 33), while for the 288-day long time series it is between 3 and 129 (i.e. 3, 5, 9, 17, 33, 65, or 129).

  3. Although this assumption is likely to be invalidated at some level by the latitudinal distribution of the solar magnetic field.

  4. The cause of this remains to be further investigated.

  5. The scaling is made by dividing the difference by its uncertainty.

References

  • Barban, C., Hill, F., Kras, S.: 2004, Simultaneous velocity-intensity spectral and cross-spectral fitting of helioseismic data. Astrophys. J. 602, 516. DOI . ADS .

    Article  ADS  Google Scholar 

  • Corbard, T., Salabert, D., Boumier, P., Picard Team: 2013, Helioseismology from SODISM and HMI intensity images. In: Jain, K., Tripathy, S.C., Hill, F., Leibacher, J.W., Pevtsov, A.A. (eds.) Fifty Years of Seismology of the Sun and Stars CS-478, Astron. Soc. Pacific, San Francisco, 151. ADS .

    Google Scholar 

  • Couvidat, S., Schou, J., Shine, R.A., Bush, R.I., Miles, J.W., Scherrer, P.H., Rairden, R.L.: 2012, Wavelength dependence of the Helioseismic and Magnetic Imager (HMI) instrument onboard the Solar Dynamics Observatory (SDO). Solar Phys. 275, 285. DOI . ADS .

    Article  ADS  Google Scholar 

  • Couvidat, S., Schou, J., Hoeksema, J.T., Bogart, R.S., Bush, R.I., Duvall, T.L., Liu, Y., Norton, A.A., Scherrer, P.H.: 2016, Observables processing for the Helioseismic and Magnetic Imager instrument on the Solar Dynamics Observatory. Solar Phys. 291, 1887. DOI . ADS .

    Article  ADS  Google Scholar 

  • Duvall, T.L. Jr., Jefferies, S.M., Harvey, J.W., Osaki, Y., Pomerantz, M.A.: 1993, Asymmetries of solar oscillation line profiles. Astrophys. J. 410, 829. DOI . ADS .

    Article  ADS  Google Scholar 

  • Froehlich, C., Andersen, B.N., Berthomieu, G., Crommelynck, D., Delache, P., Domingo, V., Jimenez, A., Jones, A.R., Roca Cortés, T., Wehrli, C.: 1988, VIRGO: The solar monitor experiment on SOHO. In: Rolfe, E.J. (ed.) Seismology of the Sun and Sun-Like Stars, SP-286, ESA, Noordwijk, 371. ADS .

    Google Scholar 

  • Frohlich, C., Andersen, B.N., Appourchaux, T., Berthomieu, G., Crommelynck, D.A., Domingo, V., Fichot, A., Finsterle, W., Gomez, M.F., Gough, D., Jimenez, A., Leifsen, T., Lombaerts, M., Pap, J.M., Provost, J., Cortes, T.R., Romero, J., Roth, H., Sekii, T., Telljohann, U., Toutain, T., Wehrli, C.: 1997, First results from VIRGO, the experiment for helioseismology and solar irradiance monitoring on SOHO. Solar Phys. 170, 1. DOI . ADS .

    Article  ADS  Google Scholar 

  • Komm, R., Howe, R., Hill, F.: 2002, Localizing width and energy of solar global p-modes. Astrophys. J. 572, 663. DOI . ADS .

    Article  ADS  Google Scholar 

  • Korzennik, S.G.: 2005, A mode-fitting methodology optimized for very long helioseismic time series. Astrophys. J. 626, 585. DOI . ADS .

    Article  ADS  Google Scholar 

  • Korzennik, S.G.: 2008, YAOPBM−II: Extension to higher degrees and to shorter time series. J. Phys. CS-118, 012082. DOI . ADS .

    Google Scholar 

  • Korzennik, S.G.: 2013, Mode frequencies from GONG, MDI, and HMI data. In: Jain, K., Tripathy, S.C., Hill, F., Leibacher, J.W., Pevtsov, A.A. (eds.) Fifty Years of Seismology of the Sun and Stars CS-478, Astron. Soc. Pacific, San Francisco, 137. ADS .

    Google Scholar 

  • Korzennik, S.G., Rabello-Soares, M.C., Schou, J.: 2004, On the determination of Michelson Doppler Imager high-degree mode frequencies. Astrophys. J. 602, 481. DOI . ADS .

    Article  ADS  Google Scholar 

  • Oliviero, M., Severino, G., Straus, T.: 2001, A high frequency and high \(l\) resolution intensity-velocity phase differences from GONG data. In: Wilson, A., Pallé, P.L. (eds.) SOHO 10/GONG 2000 Workshop: Helio- and Asteroseismology at the Dawn of the Millennium SP-464, ESA, Noordwijk,669. ADS .

    Google Scholar 

  • Pierce, A.K., Slaughter, C.D.: 1977, Solar limb darkening, I: At wavelengths of 3033-7297. Solar Phys. 51, 25. DOI . ADS .

    Article  ADS  Google Scholar 

  • Salabert, D., García, R.A., Jiménez, A.: 2013, Differences of the solar magnetic activity signature in velocity and intensity helioseismic observations. In: Jain, K., Tripathy, S.C., Hill, F., Leibacher, J.W., Pevtsov, A.A. (eds.) Fifty Years of Seismology of the Sun and Stars CS-478, Astron. Soc. Pacific, San Francisco, 145. ADS .

    Google Scholar 

  • Schou, J.: 1999, Migration of zonal flows detected using Michelson Doppler Imager F-mode frequency splittings. Astrophys. J. Lett. 523, L181. DOI . ADS .

    Article  ADS  Google Scholar 

  • Schou, J., Scherrer, P.H., Bush, R.I., Wachter, R., Couvidat, S., Rabello-Soares, M.C., Bogart, R.S., Hoeksema, J.T., Liu, Y., Duvall, T.L., Akin, D.J., Allard, B.A., Miles, J.W., Rairden, R., Shine, R.A., Tarbell, T.D., Title, A.M., Wolfson, C.J., Elmore, D.F., Norton, A.A., Tomczyk, S.: 2012, Design and ground calibration of the Helioseismic and Magnetic Imager (HMI) instrument on the Solar Dynamics Observatory (SDO). Solar Phys. 275, 229. DOI . ADS .

    Article  ADS  Google Scholar 

  • Woodard, M.F.: 1984, Short-period oscillations in the total solar irradiance. PhD thesis, University of California, San Diego. ADS .

Download references

Acknowledgements

HMI data are courtesy of NASA/SDO and the HMI science team; HMI is supported by NASA contract NAS5–02139 to Stanford University. The author wishes to thank T.P. Larson and J. Schou for providing their estimate of the intensity leakage matrix. The author is supported by NASA grant NNX15AL65G. Most of the computations done for this work were carried out on the Smithsonian Institution’s High Performance Cluster (SI/HPC).

Author information

Authors and Affiliations

  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, 02138, USA

    Sylvain G. Korzennik

Authors
  1. Sylvain G. Korzennik
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Sylvain G. Korzennik.

Ethics declarations

Disclosure of Potential Conflicts of Interest

The author declares that he has no conflicts of interest.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Korzennik, S.G. Initial Results from Fitting \(p\)-Modes Using Intensity Observations from the Helioseismic and Magnetic Imager . Sol Phys 292, 138 (2017). https://doi.org/10.1007/s11207-017-1162-8

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s11207-017-1162-8

Keywords

Search

Navigation