Resonance scattering of 30.4 nm chromospheric radiation by coronal singly ionized helium observed with EIT

被引：19

作者：

Delaboudinière, JP ^{[1
]}

机构：

[1] Univ Paris 11, Inst Astrophys Spatiale, CNRS, F-91405 Orsay, France

来源：

SOLAR PHYSICS | 1999年 / 188卷 / 02期

关键词：

D O I：

10.1023/A:1005268807716

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A diffuse emission is observed above the solar limb in the '304 Angstrom' channel of the Extreme-Ultraviolet Imaging Telescope (EIT) onboard the SOHO spacecraft. Part of this emission is attributed to the presence of residual singly-ionized helium in the solar corona, which resonantly scatters the intense helium 'Lyman alpha' radiation of the chromosphere. This emission can be distinguished from other coronal emissions in the EIT bandpass. Maps of the helium ion density integrated along the line of sight are derived. These agree well with models in the low latitude, closed magnetic field regions of the solar corona. However, the helium ions' abundance seems to be enhanced in the polar, open field regions above coronal holes. This may be related to acceleration processes of the fast solar wind close to the Sun.

引用

页码：259 / 275

页数：17

共 15 条

[1]

Arnaud M., 1985, Astronomy & Astrophysics Supplement Series, V60, P425

[2]

BREEVELD ER, 1988, ASTROPHYS LETT COMM, V27, P155

[3] PROTON AND ALPHA-PARTICLE FLUXES IN THE SOLAR-WIND - RESULTS OF A 3-FLUID MODEL [J].

BURGI, A .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1992, 97 (A3) :3137-3150

[4] Observation of quasi-periodic compressive waves in solar polar plumes [J].

DeForest, CE ;

Gurman, JB .

ASTROPHYSICAL JOURNAL, 1998, 501 (02) :L217-L220

[5] EIT: Extreme-ultraviolet imaging telescope for the SOHO mission [J].

Delaboudiniere, JP ;

Artzner, GE ;

Brunaud, J ;

Gabriel, AH ;

Hochedez, JF ;

Millier, F ;

Song, XY ;

Au, B ;

Dere, KP ;

Howard, RA ;

Kreplin, R ;

Michels, DJ ;

Moses, JD ;

Defise, JM ;

Jamar, C ;

Rochus, P ;

Chauvineau, JP ;

Marioge, JP ;

Catura, RC ;

Lemen, JR ;

Shing, L ;

Stern, RA ;

Gurman, JB ;

Neupert, WM ;

Maucherat, A ;

Clette, F ;

Cugnon, P ;

VanDessel, EL .

SOLAR PHYSICS, 1995, 162 (1-2) :291-312

[6] NEW MAUNA-LOA CORONAGRAPH SYSTEMS [J].

FISHER, RR ;

LEE, RH ;

MACQUEEN, RM ;

POLAND, AI .

APPLIED OPTICS, 1981, 20 (06) :1094-1101

[7] MEASUREMENTS ON LYMAN ALPHA CORONA [J].

GABRIEL, AH .

SOLAR PHYSICS, 1971, 21 (02) :392-&

[8] DIFFUSION EFFECTS ON THE HELIUM ABUNDANCE OF THE SOLAR TRANSITION REGION AND CORONA [J].

HANSTEEN, VH ;

HOLZER, TE ;

LEER, E .

ASTROPHYSICAL JOURNAL, 1993, 402 (01) :334-343

[9] INTENSITIES OF HELIUM LINES IN SOLAR EUV SPECTRUM [J].

JORDAN, C .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1975, 170 (02) :429-440

[10] SOLAR CORONAL OBSERVATIONS AND FORMATION OF THE HE-II 304-ANGSTROM LINE [J].

JORDAN, SD ;

THOMPSON, WT ;

THOMAS, RJ ;

NEUPERT, WM .

ASTROPHYSICAL JOURNAL, 1993, 406 (01) :346-349

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