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  • Lauri Holappa
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PhD, PostDoc

ReSoLVE Center of Excellence

University of Oulu
Space Climate Research Unit

Tel. +358-50-3502856

+358-505721746

E-mail: Lauri.Holappa(a)oulu.fi

Refereed publications:

 

  1. Holappa, L., N. Gopalswamy and K. Mursula, Explicit IMF By‐Effect Maximizes at Subauroral Latitudes (Dedicated to the Memory of Eigil Friis‐Christensen), J. Geophys. Res., in press, 2019.

  2. Holappa, L. and K. Mursula, Explicit IMF By-dependence in high-latitude geomagnetic activity, J. Geophys. Res., 123, 4728–4740, 2018.
  3. Lukianova, R., L. Holappa and K. Mursula, Centennial evolution of monthly solar wind speeds: Fastest monthly solar wind speeds from long-duration coronal holes, J. Geophys. Res. in press, 2017.
  4. Mursula, K., L. Holappa and R. Lukianova, Seasonal solar wind speeds for the last 100 years: Unique coronal hole structures during the peak and demise of the Grand Modern Maximum, Geophys. Res. Lett., 44, 3036, doi:10.1002/2016GL071573, 2017.
  5. Holappa, L. and K. Mursula, Toward more reliable long-term indices of geomagnetic activity: Correcting a new inhomogeneity problem in early geomagnetic data, J. Geophys. Res., 120, 2015.
  6. Mursula, K., R. Lukianova and L. Holappa, Occurrence of high-speed solar wind streams over the Grand Modern Maximum, Astrophys. J., 801, 30, 2015.

  7. Holappa, L., K. Mursula and T. Asikainen, A new method to estimate annual solar wind parameters and contributions of stream structures to geomagnetic activity, J. Geophys. Res., 119, 9407-9418, 2014.
  8. Holappa, L., K. Mursula, T. Asikainen and I.G. Richardson, Annual fractions of high speed streams from principal component analysis of local geomagnetic activity. J. Geophys. Res., 119, 6, 4544–4555, 2014.
  9. Yakovchouk, O.S., K. Mursula, L. Holappa, I.S. Veselovsky, A. Karinen, Average properties of geomagnetic storms in 1932-2009, J. Geophys. Res., 117, A03201, 13 PP., doi:10.1029/2011JA017093, 2012.
  10. Mursula, K., L. Holappa and A. Karinen, Uneven weighting of stations in the Dst index.  J. Atm. Solar-Terr. Phys., 73, 2-3, 316-322, 2011.
  11. Jordanova, V. K., H. Matsui, P. A. Puhl-Quinn, M. F. Thomsen, K. Mursula and L. Holappa, Ring current development during high speed streams. J. Atm. Solar-Terr. Phys, 71, 2009.
  12. Mursula, K., L. Holappa and A. Karinen, Correct normalization of the Dst index. Astrophys. Space Sci. Trans. (ASTRA), 4, 41-45, 2008.

Talks in international conferences:

 

  1. L. Holappa and K. Mursula, Explicit IMF By-dependence in high-latitude geomagnetic activity, The SCOSTEP 14th Quadrennial Solar-Terrestrial Physics Symposium, July 9-13, 2018, Toronto, Canada.
  2. L. Holappa, K. Mursula, T. Asikainen and I.G. Richardson, Annual fractions of high speed streams from principal component analysis of local geomagnetic activity, 40th Scientific Assembly of COSPAR, Moscow, Russia, August 2-10, 2014.
  3. L. Holappa and K. Mursula, Spatial distribution of geomagnetic activity and its relation to solar wind. 12th IAGA General Assembly, Merida, Mexico, August 26 -  31, 2013

Posters in international conferences:

  1. Mursula, K., L. Holappa and T. Asikainen, Studying Solar Wind Properties using Pattern Recognition Methods, 11th Space Weather Week, Liege, Belgium, November 17-21, 2014.
  2. Holappa, L., K. Mursula, T. Asikainen and I.G. Richardson, Annual fractions of high speed streams from principal component analysis of local geomagnetic activity, European Geosciences Union General Assembly, Vienna, Austria, April 28 - May 2, 2014.
  3. Holappa, L. and K. Mursula, Source and drift of ions during geomagnetic storms in 1932-2009, Fall Meeting of American Geophysical Union, San Francisco, USA, December 3 - 7, 2012
  4. Asikainen, T., L. Holappa, V. Maliniemi and K. Mursula, Monitoring the tail current contribution to the Dcx index with NOAA/POES satellites: differences between CME and HSS driven storms, European Geosciences Union General Assembly, Vienna, Austria, April 22 - 27, 2012
  5. Holappa, L., K. Mursula and A. Karinen, Dcx index server: local Dst indices for an extended station network, Fourth International Symposium on Space Climate, Goa, India, January 16 - 21, 2011
  6. Mursula, K., L. Holappa,  A. Karinen and T. Leikanger, Local Dst/Dcx indices: New space weather products from the SOTERIA project, 12th Quadrennial Symposium on Solar-Terrestrial Physics, Berlin, Germany, July 12 -- 16, 2010
  7. Mursula, K., L. Holappa and  V. Jordanova, Increased local time accuracy of the corrected Dst index, 11th IAGA General Assembly, Sopron, Hungary, August 23 - 30, 2009
  8. Mursula, K., L. Holappa and  A. Karinen, Increased local time accuracy of the corrected Dst index, Third International Symposium on Space Climate, Saariselkä, Finland, March 15 - 19, 2009
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