Magnetic field fluctuations observed in the heliosheath by Voyager 1 at 114 ± 2 AU during 2010

被引:7
作者
Burlaga, L. F. [1 ]
Ness, N. F. [2 ]
机构
[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[2] Catholic Univ Amer, Inst Astrophys & Computat Sci, Washington, DC 20064 USA
关键词
COSMIC-RAY MODULATION; ACCELERATION; HELIOSPHERE; TURBULENCE; TRANSPORT;
D O I
10.1029/2012JA017894
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The radial component of the flow speed VR in the heliosheath was decreasing between 2009.0 (108.5 AU) and 2010.3, at which time it reached the "stagnation region" where VR approximate to 0 km/s from 2010.3 to at least to 2011.0 (115.7 AU). The fluctuations of the hour averages of the magnetic field B observed by Voyager 1 (V1) each day throughout 2010 were primarily compressive (longitudinal) fluctuations, along the T (average B) direction in HG coordinates. The yearly average of the daily standard deviations (SD) of the compressive component of B was < SDc > = < SD(BT)> approximate to < SD(B)> approximate to 0.015 nT. The corresponding standard deviations of the transverse components < SDt > = SD(BR) > approximate to < SD(BN)> approximate to 0.006 nT. During 2010, < SDc >/< SDt > > 2.6 and < SDc >/< B > = 0.15. The counting rate of cosmic rays >70 MeV/nuc tends to increase with increasing B and SDc, contrary to expectations.
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页数:7
相关论文
共 26 条
[1]   Magnetic fields at the solar wind termination shock [J].
Burlaga, L. F. ;
Ness, N. F. ;
Acuna, M. H. ;
Lepping, R. P. ;
Connerney, J. E. P. ;
Richardson, J. D. .
NATURE, 2008, 454 (7200) :75-77
[2]   MAGNETIC FIELD STRENGTH FLUCTUATIONS IN THE HELIOSHEATH: VOYAGER 1 OBSERVATIONS DURING 2009 [J].
Burlaga, L. F. ;
Ness, N. F. .
ASTROPHYSICAL JOURNAL, 2012, 744 (01)
[3]   COMPRESSIBLE "TURBULENCE" OBSERVED IN THE HELIOSHEATH BY VOYAGER 2 [J].
Burlaga, L. F. ;
Ness, N. F. .
ASTROPHYSICAL JOURNAL, 2009, 703 (01) :311-324
[4]   MAGNETIC FIELD STRENGTH FLUCTUATIONS AND TEMPERATURE IN THE HELIOSHEATH [J].
Burlaga, L. F. ;
Ness, N. F. ;
Acuna, M. H. .
ASTROPHYSICAL JOURNAL LETTERS, 2009, 691 (02) :L82-L86
[5]  
Burlaga L.F., 1995, INTERPLANETARY MAGNE
[6]   Crossing the termination shock into the hetiosheath:: Magnetic fields [J].
Burlaga, LF ;
Ness, NF ;
Acuña, IH ;
Acuña, MH ;
Lepping, RP ;
Connerney, JEP ;
Stone, EC ;
McDonald, FB .
SCIENCE, 2005, 309 (5743) :2027-2029
[7]   TURBULENCE VISCOSITY AND DISSIPATION IN SOLAR-WIND PLASMA [J].
COLEMAN, PJ .
ASTROPHYSICAL JOURNAL, 1968, 153 (2P1) :371-&
[8]  
Drake J. F., 2011, 2011 FALL M AGU SAN
[9]   Long-term cosmic-ray modulation in the heliosphere [J].
Ferreira, SES ;
Potgieter, MS .
ASTROPHYSICAL JOURNAL, 2004, 603 (02) :744-752
[10]   ACCELERATION OF SUPRATHERMAL TAILS IN THE SOLAR WIND [J].
Fisk, L. A. ;
Gloeckler, G. .
ASTROPHYSICAL JOURNAL, 2008, 686 (02) :1466-1473