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Comparison between simultaneous GOLF...

Henney, Carl John.

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Comparison between simultaneous GOLF and MDI observations in search of low frequency solar oscillations.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Comparison between simultaneous GOLF and MDI observations in search of low frequency solar oscillations./
作者:	Henney, Carl John.
面頁冊數:	134 p.
附註:	Chair: Roger K. Ulrich.
Contained By:	Dissertation Abstracts International60-08B.
標題:	Physics, Astronomy and Astrophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9940464
ISBN:	0599419369

Comparison between simultaneous GOLF and MDI observations in search of low frequency solar oscillations.
Henney, Carl John.

Comparison between simultaneous GOLF and MDI observations in search of low frequency solar oscillations. - 134 p.

Chair: Roger K. Ulrich.

Thesis (Ph.D.)--University of California, Los Angeles, 1999.

One of the mission objectives of both the Global Oscillations at Low Frequency (GOLF) and the Michelson Doppler Imager (MDI) instruments aboard the Solar and Heliospheric Observatory (SOHO) is the detection of new low frequency globally coherent solar oscillation modes. After more than two years of nearly continuous observing by both instruments, the clear detection of modes below 1200 μHz has still proven to be elusive. The search for new modes is aided here by combining the high duty cycle of GOLF with the spatial resolution and various data products of MDI. By combining the two data sets, a signal enhancement is anticipated since both instruments provide a low noise data stream and their sources of solar and instrumental noise are expected to be different from each other.

ISBN: 0599419369Subjects--Topical Terms:

1019521
Physics, Astronomy and Astrophysics.

Comparison between simultaneous GOLF and MDI observations in search of low frequency solar oscillations.
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040 $a UnM $c UnM
100 1 $a Henney, Carl John. $3 1258913
245 1 0 $a Comparison between simultaneous GOLF and MDI observations in search of low frequency solar oscillations.
300 $a 134 p.
500 $a Chair: Roger K. Ulrich.
500 $a Source: Dissertation Abstracts International, Volume: 60-08, Section: B, page: 4007.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 1999.
520 $a One of the mission objectives of both the Global Oscillations at Low Frequency (GOLF) and the Michelson Doppler Imager (MDI) instruments aboard the Solar and Heliospheric Observatory (SOHO) is the detection of new low frequency globally coherent solar oscillation modes. After more than two years of nearly continuous observing by both instruments, the clear detection of modes below 1200 μHz has still proven to be elusive. The search for new modes is aided here by combining the high duty cycle of GOLF with the spatial resolution and various data products of MDI. By combining the two data sets, a signal enhancement is anticipated since both instruments provide a low noise data stream and their sources of solar and instrumental noise are expected to be different from each other.
520 $a Presented here is a comparison between the observed GOLF signal and a selection of spatially masked MDI full-disk signals for a 759 day period from May 25, 1996 through June 22, 1998. The signal-to-background ratio is compared between the various signals for low degree (<italic>l</italic> ≤ 3) and low frequency (<2000 μHz) <italic>p</italic>-modes. It was found that signals from both MDI and GOLF are beneficial for detecting these <italic> p</italic>-modes. Cross-analysis between GOLF and MDI signals is done to enhance the ability to detect low frequency solar oscillations. Using cross-amplitude and averaged power spectra, an unique list of low degree modes is presented here, along with three new low frequency acoustic mode candidates.
520 $a Finally, the effects of early main sequence cometary mass accretion with heavy-element diffusion on the solar interior are investigated. For solar models with element diffusion, the addition of mass accretion with a rate suggested by observations of other stars has a negligible effect on the predicted <italic> p</italic>-mode frequencies for the cases investigated here. The predicted <italic> g</italic>-mode frequencies exhibit a slight shift of approximately 0.1 μHz with the addition of mass accretion. Compared to previous work, the squared sound speed structure inversions with the inclusion of the three new candidate modes result in better agreement with the standard solar model below 0.3 <math> <f> <rm>R<inf>&odot;</inf></rm></f> </math>.
590 $a School code: 0031.
650 4 $a Physics, Astronomy and Astrophysics. $3 1019521
690 $a 0606
710 2 0 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertation Abstracts International $g 60-08B.
790 $a 0031
790 1 0 $a Ulrich, Roger K., $e advisor
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9940464