Does the solar magnetic field increase?

被引:8
作者
Kotov, VA
Kotova, IV
机构
[1] Crimean Astrophys Observ, UA-334413 Crimea, Ukraine
[2] Moscow MV Lomonosov State Univ, Moscow 119899, Russia
来源
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 2001年 / 27卷 / 04期
关键词
Sun;
D O I
10.1134/1.1358384
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider measurements of the general magnetic field (GMF) of the Sun as a star at four world observatories from 1968 until 1999. We show that, within the error limits, the mean strength of the photospheric magnetic field H (of its longitudinal component, in magnitude) has not changed over the last 32 years. This is in conflict with the recent conclusion by Lockwood et al. (1999) that the solar coronal magnetic field increased by 40% from 1964 until 1996 and has almost doubled in the last 100 years. The causes of discrepancies in the results are discussed. At the same time, the GMF exhibits a natural 11-year variation associated with the solar cycle. The strength of the photospheric longitudinal magnetic field (in absolute value) averaged over 32 years is 0.46 G (at an rms GMF strength of 0.57 G). The mean GMF for all years of measurements had a south polarity: (H) over bar = -0.030 +/- 0.018 G. The difference from zero is statistically significant at 1.7 sigma (90%) and may be directly related to the outstanding problem of the solar magnetic "monopole." (C) 2001 MAIK "Nauka/Interperiodica".
引用
收藏
页码:260 / 266
页数:7
相关论文
共 25 条
[1]  
BUMBA V, 1967, MAGNETIC RELATED STA
[2]  
DEMIDOV ML, 1999, COMMUNICATION
[3]  
GRIGOREV VM, 1983, AERON FIZ SOLNTSA, V65, P13
[4]  
GRIGORYEV VM, 1987, SOL PHYS, V114, P147
[5]  
GRIGORYEV VM, 1989, SOLAR MAGNETIC FIELD, V1, P108
[6]  
Haneychuk VI, 1999, ASTRON REP+, V43, P330
[7]   FILAMENTARY NATURE OF SOLAR MAGNETIC-FIELDS [J].
HOWARD, R ;
STENFLO, JO .
SOLAR PHYSICS, 1972, 22 (02) :402-&
[8]  
Kotov V.A., 1980, IZV KRYM ASTROFIZ OB, V62, P117
[9]  
Kotov V.A., 1998, IZV KRYM ASTRON OBS, V94, P110
[10]  
Kotov V. A., 1980, IZV KRYMSK ASTROFIZ, V61, P3