Optimal masks for g-mode detection in MDI velocity data

R. Wachter; J. Schou; A. Kosovichev; P. H. Scherrer

Optimal masks for g-mode detection in MDI velocity data

R. Wachter, J. Schou, A. Kosovichev, P. H. Scherrer

Research output: Contribution to journal › Conference article › peer-review

Abstract

We are applying spatial masks to MDI velocity data that are optimized for revealing g-modes in the frequency range 50 through 500 μHz. These masks take into account the horizontal component of g-mode velocity eigenfunctions as well as the time dependent mode projection properties due to the changing solar B angle, and the varying noise level across the solar disk. The solar noise, which is likely to be caused by supergranulation in this frequency range is assumed to be uniformly distributed over the solar surface, consisting of a dominant horizontal component and a small radial component. The resulting time series are examined for possible g-mode candidates and new upper limits for the surface amplitude of g-modes are obtained.

Original language	English (US)
Pages (from-to)	115-118
Number of pages	4
Journal	European Space Agency, (Special Publication) ESA SP
Issue number	508
State	Published - Jun 2002
Externally published	Yes
Event	SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO - Davos, Switzerland Duration: Mar 11 2002 → Mar 15 2002

All Science Journal Classification (ASJC) codes

Aerospace Engineering
Space and Planetary Science

Keywords

Oscillations
Sun

Cite this

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title = "Optimal masks for g-mode detection in MDI velocity data",

abstract = "We are applying spatial masks to MDI velocity data that are optimized for revealing g-modes in the frequency range 50 through 500 μHz. These masks take into account the horizontal component of g-mode velocity eigenfunctions as well as the time dependent mode projection properties due to the changing solar B angle, and the varying noise level across the solar disk. The solar noise, which is likely to be caused by supergranulation in this frequency range is assumed to be uniformly distributed over the solar surface, consisting of a dominant horizontal component and a small radial component. The resulting time series are examined for possible g-mode candidates and new upper limits for the surface amplitude of g-modes are obtained.",

keywords = "Oscillations, Sun",

author = "R. Wachter and J. Schou and A. Kosovichev and Scherrer, {P. H.}",

year = "2002",

month = jun,

language = "English (US)",

pages = "115--118",

journal = "European Space Agency, (Special Publication) ESA SP",

issn = "0379-6566",

publisher = "European Space Agency",

number = "508",

note = "SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO ; Conference date: 11-03-2002 Through 15-03-2002",

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TY - JOUR

T1 - Optimal masks for g-mode detection in MDI velocity data

AU - Wachter, R.

AU - Schou, J.

AU - Kosovichev, A.

AU - Scherrer, P. H.

PY - 2002/6

Y1 - 2002/6

N2 - We are applying spatial masks to MDI velocity data that are optimized for revealing g-modes in the frequency range 50 through 500 μHz. These masks take into account the horizontal component of g-mode velocity eigenfunctions as well as the time dependent mode projection properties due to the changing solar B angle, and the varying noise level across the solar disk. The solar noise, which is likely to be caused by supergranulation in this frequency range is assumed to be uniformly distributed over the solar surface, consisting of a dominant horizontal component and a small radial component. The resulting time series are examined for possible g-mode candidates and new upper limits for the surface amplitude of g-modes are obtained.

AB - We are applying spatial masks to MDI velocity data that are optimized for revealing g-modes in the frequency range 50 through 500 μHz. These masks take into account the horizontal component of g-mode velocity eigenfunctions as well as the time dependent mode projection properties due to the changing solar B angle, and the varying noise level across the solar disk. The solar noise, which is likely to be caused by supergranulation in this frequency range is assumed to be uniformly distributed over the solar surface, consisting of a dominant horizontal component and a small radial component. The resulting time series are examined for possible g-mode candidates and new upper limits for the surface amplitude of g-modes are obtained.

KW - Oscillations

KW - Sun

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UR - http://www.scopus.com/inward/citedby.url?scp=0036617171&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0036617171

SN - 0379-6566

SP - 115

EP - 118

JO - European Space Agency, (Special Publication) ESA SP

JF - European Space Agency, (Special Publication) ESA SP

IS - 508

T2 - SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO

Y2 - 11 March 2002 through 15 March 2002

ER -

Optimal masks for g-mode detection in MDI velocity data

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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