HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX
Since 2008 December, the Interstellar Boundary Explorer (IBEX) has been making detailed observations of neutrals from the boundaries of the heliosphere using two neutral atom cameras with overlapping energy ranges. The unexpected, yet defining feature discovered by IBEX is a Ribbon that extends over...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/95619 |
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| author | Fuselier, S. A. Allegrini, F. Bzowski, M. Funsten, H. O. Ghielmetti, A. G. Gloeckler, G. Heirtzler, D. Janzen, Paul H. Kubiak, M. A. Kucharek, Harald McComas, David J. Mobius, Eberhard Moore, T. E. Petrinec, S. M. Quinn, M. Reisenfeld, D. Saul, L. A. Scheer, J. A. Schwadron, N. Trattner, K. J. Wurz, P. Vanderspek, Roland K |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Fuselier, S. A. Allegrini, F. Bzowski, M. Funsten, H. O. Ghielmetti, A. G. Gloeckler, G. Heirtzler, D. Janzen, Paul H. Kubiak, M. A. Kucharek, Harald McComas, David J. Mobius, Eberhard Moore, T. E. Petrinec, S. M. Quinn, M. Reisenfeld, D. Saul, L. A. Scheer, J. A. Schwadron, N. Trattner, K. J. Wurz, P. Vanderspek, Roland K |
| author_sort | Fuselier, S. A. |
| collection | MIT |
| description | Since 2008 December, the Interstellar Boundary Explorer (IBEX) has been making detailed observations of neutrals from the boundaries of the heliosphere using two neutral atom cameras with overlapping energy ranges. The unexpected, yet defining feature discovered by IBEX is a Ribbon that extends over the energy range from about 0.2 to 6 keV. This Ribbon is superposed on a more uniform, globally distributed heliospheric neutral population. With some important exceptions, the focus of early IBEX studies has been on neutral atoms with energies greater than ~0.5 keV. With nearly three years of science observations, enough low-energy neutral atom measurements have been accumulated to extend IBEX observations to energies less than ~0.5 keV. Using the energy overlap of the sensors to identify and remove backgrounds, energy spectra over the entire IBEX energy range are produced. However, contributions by interstellar neutrals to the energy spectrum below 0.2 keV may not be completely removed. Compared with spectra at higher energies, neutral atom spectra at lower energies do not vary much from location to location in the sky, including in the direction of the IBEX Ribbon. Neutral fluxes are used to show that low energy ions contribute approximately the same thermal pressure as higher energy ions in the heliosheath. However, contributions to the dynamic pressure are very high unless there is, for example, turbulence in the heliosheath with fluctuations of the order of 50-100 km s[superscript –1]. |
| first_indexed | 2024-09-23T15:12:34Z |
| format | Article |
| id | mit-1721.1/95619 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:12:34Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/956192022-09-29T13:23:07Z HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX Fuselier, S. A. Allegrini, F. Bzowski, M. Funsten, H. O. Ghielmetti, A. G. Gloeckler, G. Heirtzler, D. Janzen, Paul H. Kubiak, M. A. Kucharek, Harald McComas, David J. Mobius, Eberhard Moore, T. E. Petrinec, S. M. Quinn, M. Reisenfeld, D. Saul, L. A. Scheer, J. A. Schwadron, N. Trattner, K. J. Wurz, P. Vanderspek, Roland K MIT Kavli Institute for Astrophysics and Space Research Vanderspek, Roland K. Since 2008 December, the Interstellar Boundary Explorer (IBEX) has been making detailed observations of neutrals from the boundaries of the heliosphere using two neutral atom cameras with overlapping energy ranges. The unexpected, yet defining feature discovered by IBEX is a Ribbon that extends over the energy range from about 0.2 to 6 keV. This Ribbon is superposed on a more uniform, globally distributed heliospheric neutral population. With some important exceptions, the focus of early IBEX studies has been on neutral atoms with energies greater than ~0.5 keV. With nearly three years of science observations, enough low-energy neutral atom measurements have been accumulated to extend IBEX observations to energies less than ~0.5 keV. Using the energy overlap of the sensors to identify and remove backgrounds, energy spectra over the entire IBEX energy range are produced. However, contributions by interstellar neutrals to the energy spectrum below 0.2 keV may not be completely removed. Compared with spectra at higher energies, neutral atom spectra at lower energies do not vary much from location to location in the sky, including in the direction of the IBEX Ribbon. Neutral fluxes are used to show that low energy ions contribute approximately the same thermal pressure as higher energy ions in the heliosheath. However, contributions to the dynamic pressure are very high unless there is, for example, turbulence in the heliosheath with fluctuations of the order of 50-100 km s[superscript –1]. United States. National Aeronautics and Space Administration. Explorers Program 2015-02-25T17:23:56Z 2015-02-25T17:23:56Z 2012-06 2012-01 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/95619 Fuselier, S. A., F. Allegrini, M. Bzowski, H. O. Funsten, A. G. Ghielmetti, G. Gloeckler, D. Heirtzler, et al. “ HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX .” The Astrophysical Journal 754, no. 1 (June 29, 2012): 14. © 2012 The American Astronomical Society en_US http://dx.doi.org/10.1088/0004-637x/754/1/14 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Fuselier, S. A. Allegrini, F. Bzowski, M. Funsten, H. O. Ghielmetti, A. G. Gloeckler, G. Heirtzler, D. Janzen, Paul H. Kubiak, M. A. Kucharek, Harald McComas, David J. Mobius, Eberhard Moore, T. E. Petrinec, S. M. Quinn, M. Reisenfeld, D. Saul, L. A. Scheer, J. A. Schwadron, N. Trattner, K. J. Wurz, P. Vanderspek, Roland K HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX |
| title | HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX |
| title_full | HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX |
| title_fullStr | HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX |
| title_full_unstemmed | HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX |
| title_short | HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX |
| title_sort | heliospheric neutral atom spectra between 0 01 and 6 kev from ibex |
| url | http://hdl.handle.net/1721.1/95619 |
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