Ierkic, H. M.; Haldoupis, C.; Moorcroft, D. R.; Nielsen, E.: Coherent radar interferometry of vertical irregularity structures in the auroral E region. Radio Science 27, pp. 743 - 758 (1992)
Holden, D. N.; Ulbrich, C. W.; Larsen, M. F.; Röttger, J.; Ierkic, H. M.; Swartz, W.: UHF and VHF radar observations of thunderstorms. Handbook for MAP 20, pp. 288 - 292 (1986)
Ierkic, H. M.; Röttger, J.; Hagen, J. B.; Zimmerman, R. K.: Method to determine the optimal parameters of the Arecibo 46.8 MHz antenna system. Handbook for MAP 20, pp. 420 - 424 (1986)
Röttger, J.; Ierkic, H. M.; Zimmerman, R. K.; Hagen, J.: Investigations of the lower and middle atmosphere at the Arecibo Observatory and a description of the new VHF radar project. Handbook for MAP 20, pp. 349 - 358 (1986)
Röttger, J.; Larsen, M. F.; Ierkic, H. M.; Hagfors, T.: Need for a subtropical wind profiling system. Handbook for MAP (Middle Atmosphere Program) 20, pp. 86 - 89 (1986)
Hagfors, T.; Gold, T.; Ierkic, H. M.: Refraction scattering as origin of the anomalous radar returns of Jupiter's satellites. Nature 315 (6021), pp. 637 - 640 (1985)
Röttger, J.; Ierkic, H. M.: Postset beam steering and interferometer applications of VHF radars to study winds, waves and turbulence in the lower and middle atmosphere. Radio Science 20, pp. 1461 - 1480 (1985)
Haldoupis, C. I.; Nielsen, E.; Ierkic, H. M.: STARE Doppler spectral studies of westward electrojet radar aurora. Planetary and Space Science 32, p. 1291 (1984)
Ierkic, H. M.; Röttger, J.: Mesospheric measurements of irregularity patches using a 3-antenna interferometer. Handbook for MAP 14, pp. 174 - 178 (1984)
Nielsen, E.; Haldoupis, C. I.; Fejer, B. G.; Ierkic, H. M.: Dependence of auroral power spectral variations upon electron drift velocity in the eastward electrojet. Journal Geophysical Research 89, pp. 253 - 260 (1984)
Fejer, J. A.; Ierkic, H. M.; Woodman, R. F.; Röttger, J.; Sulzer, M.; Behnke, R. A.; Veldhuis, A.: Observations of the HF-enhanced plasma line with a 46.8-MHz radar and reinterpretation of previous observations with the 430-MHz radar. Journal Geophysical Research 88, pp. 2083 - 2092 (1983)
Whitehead, J. D.; Ierkic, H. M.; Nielsen, E.: Splitting and divergence of ``STARE'' auroral radar velocities. Journal Geophysical Research 88, p. 2147 (1983)
The Uranian magnetic field is more expansive than previously thought, according to newly analyzed data from Voyager 2, making it easier to search for moons with oceans.
The Planetary Plasma Environments group (PPE) has a strong heritage in the exploration of planetary magnetospheres and space plasma interactions throughout the solar system. It has contributed instruments to several past missions that flew-by or orbited Jupiter (Galileo, Cassini, Ulysses). The PPE participates in the JUICE mission by contributing hardware and scientific expertise to the Particle Environment Package (PEP).