Abstract
Evidence for the existence of the FIP-efifect in the transition region is presented here based on recent observations from the Coronal Diagnostic Spectrometer (CDS) on-board the Solar and Heliospheric observatory (SOHO). observations of an emerging flux region in lines of Mg v-VII and Ne VI-VII reveal differences in the relative Mg/Ne abundance of a factor of 9.2 between two transition region brightenings separated by less than 1 arc min on the Sun. The lower abundance ratio is approximately equal to the photosphcric Mg/Ne value and is associated with a small loop-like feature in the central, hottest part of the active region. The higher abundance ratio is found in spike-like structures at the edge of the active region. A density diagnostic of O IV is used to derive an electron number density of 1011.3 cm-3 for the low Mg/Ne brightening, while a Mg VII diagnostic gives a density of 109.2 cm for the high Mg/Ne brightening.
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References
Anders, E. and Grevesse, N.: 1989, Geochtm. Cosmochiim. 53, 197.
Arnaud, M. and Raymond, J. C.: 1992, Astrophys. J. 398, 394.
Arnaud, M. and Rothenflug, R.: 1985, Astron. Astrophys. Suppl. Ser. 60, 425.
Bhatia, A. K. and Dosehek, G. A.; 1995, Atom. Dat. Nucl. Dot. Tables 60, 145.
Bhatia, A. K. and Mason, H. E.: 1980, Monthly Notices Roy. Astron. Soc. 190, 925.
Dere, K. P, Landi, E., Mason, H. E., Monsignori-Fossi, B. F., and Young, P. R.: 1997, Astron. Astrophys. Suppl., in press.
Feldman, U.: 1992, Phys. Scripta 46, 202.
Feldman, U. and Widing, K. G.: 1990, Astrophys. J. 363, 292.
Feldman, U., Widing, K. G., and Lund, P. A: 1990, Astrophys. J. 364, L21.
Feldman, U. and Widing, K. G.: 1993, Astrophys. J. 414, 381.
Fludra, A., Harrison, R. A, Brekke, P., Mason, H. E., Pike, C. D., Thompson, W T., and Young, P. R.: 1997, Solar Phys. 175, 487 (this issue).
Grevesse, N., Noels, A., and Sauvai, A. J.: 1992, in ‘Coronal Streamers, Coronal Loops and Coronal and Solar Wind Composition’, Proc. of the First SOHO Workshop, ESA SP-348, p. 305.
Harrison, R. A., Fludra, A., Pike, C. D., Payne, J., Thompson, W. T., Poland, A. I., Breeveld, E. R., Breeveld, A. A., Culhane, J. L., Kjeldseth-Moe, O., Huber, M. C. E., and Aschenbach, B.; 1997, Solar Phys. 170, 123.
Harrison, R. A., Sawyer E. C., Carter, M. K., Cruise, A. M., Cutler, R. M., Fludra, A., Hayes, R. W, Kent, B. J., Lang, J., Parker, D. J., Payne, J., Pike, C. D., Peskett, S. C., Richards, A. G., Culhane, J. L., Norman, K., Breeveld, A. A., Breeveld, E. R., Al Janabi, K. F., McCalden, A. J., Parkinson, J. H., Self, D. G., Thomas, P. D., Poland, A. I., Thomas, R. J., Thompson, W. T., Kjeldseth-Moe, O., Brekke, P., Karud, J., Maltby, P., Aschenbach, B., Brauninger, H., Kuhne, M., Hollandt, J., Siegmund, O. H. W, Huber, M. C. E., Gabriel, A. H., Mason, H. E., and Bromage, B. J. L: 1995, Solar Phys. 162, 233.
Mason, H. E.: 1995, Adv. Space Res. 15, 53.
Mason, H. E. and Bhatia, A. K.: 1978, Monthly Notices Roy. Astron. Soc. 184, 423.
Mason, H. E., Young, P. R., Pike, C. D., Harrison, R. A., Fludra, A., Bromage, B. J. I., and Del Zanna, G.: 1997, Solar Phys. 170, 143.
Meyer, J.-P: 1985a, Astrophys. J. Suppl. 57, 151.
Meyer, J.-P: 1985b, Astrophys. J. Suppl. 57, 173.
Meyer, J.-P.: 1993, Adv. Space Res. 13, 377.
Pottasch, S. R.: 1964, Space Sci. Rev. 3, 816.
Sheeley, N. R.: 1995, Astrophys. J. 440, 884.
Sheeley, N. R.: 1996, Astrophys. J. 469, 423.
Thomas, R. J. and Neupert, W. M.: 1994, Astrophys. J. Suppl. 91, 461.
Widing, K. G., Feldman, U., and Bhatia, A. K.: 1986, Astrophys. J. 308, 982.
Widing, K. G. and Feldman, U.: 1989, Astrophys. J. 344, 1046.
Widing, K. G. and Feldman, U.: 1992, Astrophys. J. 392, 715.
Widing, K. G. and Feldman, U. 1993, Astrophys. J. 416, 392.
Young, P. R., Landi, E., and Thomas, R. J.: 1997, Astron. Astrophys., submitted.
Zhang, H. L. and Sampson, D. H.: 1992, Atom. Dat. Nucl. Dat. Tables 52, 143.
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Young, P.R., Mason, H.E. (1997). The Mg/Ne Abundance Ratio in a Recently Emerged Flux Region Observed by CDS. In: Fleck, B., Švestka, Z. (eds) The First Results from SOHO. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5236-5_29
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