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Width and Variation of the ENA Flux Ribbon Observed by the Interstellar Boundary Explorer
S. A. Fuselier,1,*F. Allegrini,2,3H. O. Funsten,4A. G. Ghielmetti,1D. Heirtzler,5H. Kucharek,5O. W. Lennartsson,1D. J. McComas,2,3E. Möbius,5T. E. Moore,6S. M. Petrinec,1L. A. Saul,7J. A. Scheer,7N. Schwadron,8P. Wurz7
The dominant feature in Interstellar Boundary Explorer (IBEX)sky maps of heliospheric energetic neutral atom (ENA) flux isa ribbon of enhanced flux that extends over a broad range ofecliptic latitudes and longitudes. It is narrow (~20° averagewidth) but long (extending over 300° in the sky) and isobserved at energies from 0.2 to 6 kilo–electron volts.We demonstrate that the flux in the ribbon is a factor of 2to 3 times higher than that of the more diffuse, globally distributedheliospheric ENA flux. The ribbon is most pronounced at ~1 kilo–electronvolt. The average width of the ribbon is nearly constant, independentof energy. The ribbon is likely the result of an enhancementin the combined solar wind and pickup ion populations in theheliosheath.
1 Lockheed Martin Advanced Technology Center, Palo Alto, CA 94304, USA. 2 University of Texas at San Antonio, San Antonio, TX 78249, USA. 3 Southwest Research Institute, San Antonio, TX 78228, USA. 4 Los Alamos National Laboratory, Los Alamos, NM 87545, USA. 5 University of New Hampshire, Durham, NH 03824, USA. 6 Goddard Space Flight Center, Greenbelt, MD 20771, USA. 7 University of Bern, Physikalisches Institut, 3012 Bern, Switzerland. 8 Boston University, Boston, MA 02215, USA.
* To whom correspondence should be addressed. E-mail: stephen.a.fuselier{at}lmco.com
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