Nielsen, E.; del Pozo, C. F.; Williams, P. J. S.: VHF coherent radar signals from the E region ionosphere and the relationship to electron drift velocity and ion acoustic velocity. Journal Geophysical Research 107 (A6), 1012 (2002)
Timofeev, E. E.; Vallinkoski, M. K.; Pollari, P.; Kangas, J.; Virdi, T.; Williams, P. J. S.; Nielsen, E.: Flow angle dependence of 1-m ionospheric plasma wave turbulence for near-threshold radar echo electric field. Journal Geophysical Research 107 (A10), 1286 (2002)
Timofeev, E. E.; Vallinkoski, M. K.; Pollari, P.; Kangas, J.; Virdi, T.; Williams, P. J. S.; Nielsen, E.: Correction to: Flow angle dependence of 1-m ionospheric plasma wave turbulence for near-threshold radar echo electric field. Journal Geophysical Research 107 (A12), 1450 (2002)
Kosch, M. J.; Nielsen, E.: Statistical average estimates of high latitude field-aligned currents from the STARE and SABRE coherent VHF radar system. Advances in Space Research 27, pp. 1239 - 1244 (2001)
Nielsen, E.: Direct experimental test of Joule heating damping of a Pc5 pulsation using the STARE radar system. Journal Geophysical Research 106, pp. 25835 - 25845 (2001)
Nielsen, E.; Honary, F.: Observations of ionospheric flows and particle precipitation following a Sudden Commencement. Annales Geophysicae 18 (8), pp. 908 - 917 (2000)
Barbin, Y.; Kofman, W.; Nielsen, E.; Hagfors, T.; Seu, R.; Picardi, G.; Svedhem, H.: The CONSERT instrument for the ROSETTA mission. Advances in Space Research 24, pp. 1115 - 1126 (1999)
Nielsen, E.; Bruns, M.; Pardowitz, I.; Perplies, H.; Bemmann, L.; Janhunen, P.; Huuskonen, A.: STARE: Observations of a field-aligned line current. Geophysical Research Letters 26, pp. 21 - 24 (1999)
Barr, R.; Stubbe, P.; Rietveld, M. T.; Nielsen, E.: Enhanced ELF wave generation efficiency using `O' mode HF heating in the ionosphere: An instrumental explanation. Geophysical Research Letters 25, p. 3489 (1998)
Kosch, M. J.; Hagfors, T.; Nielsen, E.: A new digital all-sky imager experiment for optical auroral studies in conjunction with the Scandinavian twin auroral radar experiment. Review of Scientific Instruments 69, pp. 578 - 584 (1998)
Kosch, M. J.; Scourfield, M. W. J.; Nielsen, E.: A self-consistent explanation for a plasma flow vortex associated with the brightening of an auroral arc. Journal Geophysical Research 103, pp. 29383 - 29391 (1998)
Nielsen, E.; Hagfors, T.: Plans for a new Rio-Imager experiment in Northern Scandinavia. Journal of Atmospheric and Solar-Terrestrial Physics 59, pp. 939 - 949 (1997)
Mishra, S. P.; Nielsen, E.: Response of ionospheric electric fields to variations in the interplanetary field. Annales Geophysicae 14 (8), pp. 794 - 802 (1996)
Chen, P.-R.; Yi, L.; Nielsen, E.: Variations of the mean phase velocity of 1-m ionospheric plasma waves with the plasma electron temperature. Journal Geophysical Research 100, pp. 1647 - 1652 (1995)
Elphinstone, R. D.; Hearn, D. J.; Cogger, L. L.; Murphree, J. S.; Singer, H.; Sergeev, V.; Mursula, K.; Klumpar, D. M.; Reeves, G. D.; Johnson, M.et al.; Ohtani, S.; Potemra, T. A.; Sandahl, I.; Nielsen, E.; Persson, M.; Opgenoorth, H.; Newell, P. T.; Feldstein, Y. I.: Observations in the vicinity of substorm onset: Implications for the substorm process. Journal Geophysical Research 100, pp. 7937 - 7969 (1995)
Greenwald, R. A.; Baker, K. B.; Dudeney, J. R.; Pinnock, M.; Jones, T. B.; Thomas, E. C.; Villain, J.-P.; Cerisier, J.-C.; Senior, C.; Hanuise, C.et al.; Hunsucker, R. D.; Sofko, G.; Koehler, J.; Nielsen, E.; Pellinen, R.; Walker, A. D. M.; Saot, N.; Yamagishi, H.: DARN/SUPERDARN: A global view of the dynamics of high-latitude convection. Space Science Reviews 71, pp. 761 - 796 (1995)
Kosch, M. J.; Nielsen, E.: Coherent radar estimates of average high-latitude ionospheric Joule heating. Journal Geophysical Research 100, pp. 12201 - 12215 (1995)
How does our star heat its outer atmosphere, the solar corona, to unimaginable temperatures of up to 10 million degrees Celsius? With unprecedented observational data from ESA's Solar Orbiter spacecraft and powerful computer simulations, ERC starting grant awardee Pradeep Chitta intends to bring new momentum to the search for the coronal heating mechanism.
The research group “Solar Lower Atmosphere and Magnetism” (SLAM) studies the conditions and dynamic processes in the atmospheric layer between the solar surface (photosphere) and the overlying chromosphere, an approximately 2000 km thick gas layer.
The main research fields of the department "Sun and Heliosphere" are covered by the research groups "Solar and Stellar Coronae", "Solar Lower Atmosphere and Magnetism", "Solar and Stellar Magnetohydrodynamics" and "Solar Variability and Climate".