Solar Physics

, Volume 265, Issue 1–2, pp 187–195 | Cite as

Remote Sensing of Magnetic-Cloud Topology

  • Donald V. ReamesEmail author
Remote Sensing of the Inner Heliosphere


We investigate the topology of magnetic clouds using energetic particles from a variety of sources outside the clouds as probes to remotely sense the interconnections of the magnetic field. We find that only a small percentage of field lines in magnetic clouds are truly closed directly to the Sun, so as to exclude particles from an external source. Field lines that are open to the outer heliosphere must be mixed with closed field lines on a fine spatial scale in the clouds to explain the simultaneous observation of anomalous cosmic rays from the outer heliosphere and of counter-streaming suprathermal electrons from the corona. The results of this paper show that, given sufficient time, particles accelerated at shock waves outside magnetic clouds have access to the interior and to a wide region of solar longitude in interplanetary space surrounding the clouds.


Solar energetic particles Shock waves Magnetic clouds 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Aschwanden, M.J., Nightingale, R.W., Alexander, D.: 2000, Astrophys. J. 541, 1059. CrossRefADSGoogle Scholar
  2. Burlaga, L.F., Sittler, E., Mariani, F., Schwenn, R.: 1981, J. Geophys. Res. 86, 6673. CrossRefADSGoogle Scholar
  3. Cane, H.V., Richardson, I.G., Wibberenz, G.: 1997, J. Geophys. Res. 102, 7075. CrossRefADSGoogle Scholar
  4. Crooker, N.U., Gosling, J.T., Kahler, S.W.: 2002, J. Geophys. Res. 107(A2), 1028. CrossRefGoogle Scholar
  5. Forbush, S.E.: 1946, Phys. Rev. 70, 771. CrossRefADSGoogle Scholar
  6. Giacalone, J., Jokipii, J.R.: 1999, Astrophys. J. 520, 204. CrossRefADSGoogle Scholar
  7. Gosling, J.T., Birn, J., Hesse, M.: 1995, Geophys. Res. Lett. 22, 869. CrossRefADSGoogle Scholar
  8. Gosling, J.T., Baker, D.N., Bame, S.J., Feldman, W.C., Zwickl, R.D., Smith, E.J.: 1987, J. Geophys. Res. 92, 8519. CrossRefADSGoogle Scholar
  9. Jokipii, J.R., Parker, E.N.: 1969, Astrophys J. 155, 777. CrossRefADSGoogle Scholar
  10. Kahler, S.W., Reames, D.V.: 1991, J. Geophys. Res. 96, 9419. CrossRefADSGoogle Scholar
  11. Krittinatham, W., Ruffolo, D.: 2009, Astrophys. J. 704, 831. CrossRefADSGoogle Scholar
  12. Mazur, J.E., Mason, G.M., Dwyer, J.R., Giacalone, J., Jokipii, J.R., Stone, E.C.: 2000, Astrophys. J. Lett. 532, 79. CrossRefADSGoogle Scholar
  13. Owens, M.J., Crooker, N.U.: 2007, J. Geophys Res. 112, A06106. CrossRefGoogle Scholar
  14. Parker, E.N.: 1987, Phys. Today 40(7), 36. CrossRefGoogle Scholar
  15. Reames, D.V.: 1999, Space Sci. Rev. 90, 413. CrossRefADSGoogle Scholar
  16. Reames, D.V., Barbier, L.M., Ng, C.K.: 1996, Astrophys. J. 466, 473. CrossRefADSGoogle Scholar
  17. Reames, D.V., Kahler, S.W., Ng, C.K.: 1997, Astrophys. J. 491, 414. CrossRefADSGoogle Scholar
  18. Reames, D.V., Kahler, S.W., Tylka, A.J.: 2009, Astrophys. J. Lett. 700, 196. CrossRefADSGoogle Scholar
  19. Shodhan, S., Crooker, N.S., Kahler, S.W., Fritzenreiter, R.J., Larson, D.E., Lepping, R.P., Siscoe, G.L., Gosling, J.T.: 2000, J. Geophys. Res. 105, 27261. CrossRefADSGoogle Scholar
  20. Warren, H.P., Ugarte-Urra, I., Doschek, G.A., Brooks, D.H., Williams, D.R.: 2008, Astrophys. J. Lett. 681, 131. CrossRefADSGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Institute for Physical Science and TechnologyUniversity of MarylandCollege ParkUSA

Personalised recommendations