0254-6124/2011/31(6)-716–09Chin.J.Space Sci.
Ma Yuan,Xie Ruixiang,Zheng Xiangmin,Wang Min,Yan Yihua.Statistical analysis of type I I I bursts in the centimetric-decimetric wavelength region.Chin.J.Space Sci.,2011,31(6):716-724
−I I I
1,21,21,21,22
1(650011)
2(100012)
23(2000720049)625∼1500MHz,2600∼3800MHz 5200∼7600MHz I I I.I I I
.,,
.I I I625∼3800MHz,.
,,,
.,I I I5200∼7600MHz ,.–I I I
.
,I I I,
P353
Statistical Analysis of Type I I I Bursts in the Centimetric-Decimetric Wavelength Region
MA Yuan1,2XIE Ruixiang1,2ZHENG Xiangmin1,2
WANG Min1,2YAN Yihua2
1(Yunnan Astronomical Obrvatory,Chine Academy of Sciences,Kunming650011)
2(National Astronomical Obrvatories,Chine Academy of Sciences,Beijing100012)
Abstract A statistical analysis of multi-band type I I I bursts obrved with the spectrographes in the ranges of625∼1500MHz,2600∼3800MHz and5200∼7600MHz during the23rd solar cycle (from July2000to September2004)is carried out in the paper.The main statistical , distribution of type I I I bursts,duration,frequency drift rate(normal and rever slopes),degree of polarization and fr
equency bandwidth are given.The results indicate that the average values of the frequency drift rates and frequency bandwidths increa with the frequency.The average values of the durations and degrees of polarization are neither constant nor uniform varying over broad frequency extent.Most of type I I I bursts are distributed within the range from625to3800MHz,and
2010-06-02,2011-06-30
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:–I I I717
decrea with the increa in frequency.This distribution result means that the places of electron acceleration and energy relea are mainly within the decimetric range,and the characteristic of frequency range is possibly related with the magnetic configuration on decimetric wavelengths,and
断陷湖the position of the electron acceleration in the reconnection region of magneticfield nearby the place
画拼音of the mainflare.However,there are large number type I I I bursts in the range of5200∼7600MHz. This diagnostic means that the place of electron acceleration is in the broad range of the corona.The radiation mechanisms of type I I I bursts on centimetric-decimetric wavelengths most probably includ
e
the coherent plasma radiation or the emission process of electron cyclotron mar.
Key words Solar radio radiation,Multi-band type I I I burst,Statistical analysis
1
I I I CME
,
.
[1−2].20,
I I I,
[3].
,I I I
.
,I I I
I I I
[4−12].,I I I ,[13].
,I I I,
,
.I I I
,.
,,
I I I,
[14,1].–
,
,
新的征程I I I
.3
步虚
23,
I I I
.2
3
625∼1500MHz, 2600∼3800MHz5200∼7600MHz,
8ms,8ms5ms,
1.37MHz,20MHz20MHz,2%
,,
10%.
2000720049
,3267,127104I I I ,
.I I I:
30000MHz/s, 3000ms,>3σ(σ),.
,I I I
,.
,800∼975MHz,
,.
3
3.1I I I
625∼1500MHz267I I I ,,140,127
正宗炸酱面
.
I I I
1(a)2(a).1(a)2(a)
,625∼1500MHz I I I
.
2600∼3800MHz127I I I
,78,49
718Chin.J.Space Sci.
2011,31(6)
.I I I
1(b)
2(b)
.
1(b)
,I I I
2600∼3800MHz
,
(
2b).
5200∼7600MHz 104
I I I
,
47
,57
,I I I
1(c)
2(c)
,
,
,
,
.
625∼7600MHz
I I I
,
,
I I I
,
I I I
625∼3800MHz门卫招聘
,
,
.
,
,
,
I I I
(625∼3800MHz).
,
[15]
..
[1]
,
.
I I I
[1]
.
3.2I I I
625∼1500MHz
,
,
5
.
,
267
I I I
262
1I I I
(
)
Fig.1Histograms of type I I I burst number distribution with the starting frequencies (the solid and dashed lines
reprent the positive and negative frequency drift rates
respectively)
2I I I
(
)
Fig.2Histograms of type I I I burst number distribution with the ending frequencies (the solid and dashed lines
reprent the positive and negative frequency drift rates respectively)
:–I I I719
173∼2437ms,837ms.
2600∼3800MHz,
,1.126
175∼1712ms,
669ms.
5200∼7600MHz
2,102
141∼2490ms,763ms.
I I I3
3.
I I I,I I I
,1∼103s[16−17],
I I I,25∼200ms[7].
,,
销售术语,. 625∼3800MHz,I I I
[7,19],I I I
τ≈220f−1s[20](f MHz).
2600∼7600MHz,
669ms763ms,3(b),
(c),[7–8].
[7]I I I
τ≈107.71f−0.95ms(f MHz).
[18]2600∼3800MHz73
20s I I I,
τ≈5.98×104f−0.05s.5200∼7600MHz 102I I Iτ≈1044.2f−0.829s.
(7600MHz),
I I I,
[20].
3.3
625∼1500MHz267,140
(),38∼6381MHz/s,1019MHz/s;127
(),−24∼−4982MHz/s,−849MHz/s.
2600∼3800MHz127,78
,235∼14571MHz/s, 2689MHz/s;49,−257∼−19428MHz/s,−3084MHz/s.
5200∼7600MHz104,47
,720∼2400MHz/s,
3
Fig.3Distributions of the half-power durations in the three frequency ranges,respectively
720Chin.J.Space Sci.2011,31(6)
6768MHz/s;57,−605∼−27127MHz/s,−9403MHz/s.
4I I I
,,
.,
[8,22],
.,2600∼3800MHz
,[7], 1700∼17000MHz/s.,[23]75∼550000kHz18–
I I I d f/d t=−0.01f1.84MHz/s.625∼1500MHz 127I I I
d f/d t=−2.6×10−6f2.709MHz/s.
I I I–
门前大桥下简谱I I I.,
,–
.
,I I I–()()[1,24].
,I I I
,
,
4
[25].
3.4
25∼1500MHz267,
206,6%∼70%,
20%,120,86 .
2600∼3800MHz127,
105,
6%∼90%,36.5%,57
,48.
5200∼7600MHz75,
6%∼55%,
16%,40,35.
5I I I
.,I I I
.,
I I I,
50%[26−27].
4
Fig.4Distributions of the frequency drift rate in the three frequency ranges,respectively
