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Sudden intensity increases and radial gradient changes of cosmic ray MeV electrons and protons observed at Voyager 1 beyond 111 AU in the heliosheath
| Content Provider | Semantic Scholar |
|---|---|
| Author | Webber, William R. McDonald, Frank B. Cummings, Alan C. Stone, Edward C. Heikkila, Bryant C. Lal, Nijil |
| Copyright Year | 2012 |
| Abstract | [1] Voyager 1 has entered regions of different propagation conditions for energetic cosmic rays in the outer heliosheath at a distance of about 111 AU from the Sun. The low energy 6–14 MeV galactic electron intensity increased by ~20% over a time period ≤10 days and the electron radial intensity gradient abruptly decreased from 19%/AU to 8%/AU at 2009.7 at a radial distance of 111.2 AU. At about 2011.2 at a distance of 116.6 AU a second abrupt intensity increase of 25% was observed for electrons. After the second sudden electron increase the radial intensity gradient increased to 18%/AU. This large positive gradient and the 13 day periodic variations of >200 MeV particles observed near the end of 2011 indicate that V1 is still within the overall heliospheric modulating region. The implications of these results regarding the proximity of the heliopause are discussed. Citation: Webber, W. R., F. B. McDonald, A. C. Cummings, E. C. Stone, B. Heikkila, and N. Lal (2012), Sudden intensity increases and radial gradient changes of cosmic ray MeV electrons and protons observed at Voyager 1 beyond 111 AU in the heliosheath, Geophys. Res. Lett., 39, L06107, doi:10.1029/ 2012GL051171. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://authors.library.caltech.edu/31278/1/Webber2012p17928Geophys_Res_Lett.pdf |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20140005825.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Allergy Unit COSMIC Electron Electrons Gold Gradient NCR Voyager One-electron universe Protons Radial (radio) Radial basis function Radiation Software propagation |
| Content Type | Text |
| Resource Type | Article |
