Publikationen

Examensarbeiten

1. Achatz, U., 1989: Stabilität von Elektron-Positron-Jets in aktiven galaktischen Kernen. Diplomarbeit, Universität Bonn

2. Achatz, U., 1992: Dispersive Elektromagnetische Plasmawellen und ihr Einfluss auf den Transport geladener Teilchen in thermischen astrophysikalischen Plasmen. Doktorarbeit, Universität Bonn

3. Achatz, U., 2006: Modal and nonmodal instabilities of gravity waves in rotating Boussinesq fluids: Linear and nonlinear dynamics. Habilitationsschrift, Universität Rostock

Referierte Veröffentlichungen (als Erstautor)

1. Achatz, U., H. Lesch und R. Schlickeiser, 1990: Jets and hot spots in extragalactic radio sources. Astron. Astrophys., 233, 391-409

2. Achatz, U., J. Steinacker und R. Schlickeiser, 1991: Charged particle transport in a turbulent magnetized plasma: A reassessment and extension of quasilinear theory. Astron. Astrophys., 250, 266-279

3. Achatz, U., W. Dröge, R. Schlickeiser und G. Wibberenz, 1993: Interplanetary Transport of Solar Electrons and Protons: Effect of Dissipative Processes in the Magnetic Field Power Spectrum. J. Geophys. Res., 98, 13261-13280

4. Achatz, U. und R. Schlickeiser, 1993: Electromagnetic stability of electron-positron beams. Astron. Astrophys., 274, 165-173

5. Achatz, U., W. Dröge, R. Schlickeiser und G. Wibberenz, 1993: Interplanetary Transport of Solar Cosmic Rays, Nucl. Phys. B (Proc. Suppl.), 33 A, B, 200-207

6. Achatz, U., G. Schmitz und K.-M. Greisiger, 1995: Principal Interaction Patterns in baroclinic wave life cycles. J. Atmos. Sci., 52, 3201-3213 (pdf)

7. Achatz, U. und G. Schmitz, 1997: On the closure problem in the reduction of complex atmospheric models by PIPs and EOFs: A comparison for the case of a two-layer model with zonally symmetric forcing. J. Atmos. Sci., 54, 2452-2474 (pdf)

8. Achatz, U. und G. Branstator, 1999: A two-layer model with empirical linear corrections and reduced order for studies of internal climate variability. J. Atmos. Sci., 56, 3140-3160

9. Achatz, U. und J. D. Opsteegh, 2003a: Primitive-equation-based low-order models with seasonal cycle. Part I: Model construction. J. Atmos. Sci., 60, 465-477 (extended pdf)

10. Achatz, U. und J. D. Opsteegh, 2003b: Primitive-equation-based low-order models with seasonal cycle. Part II: Application to complexity and nonlinearity of large-scale atmosphere dynamics. J. Atmos. Sci., 60, 478-490 (extended pdf)

11. Achatz, U., 2005: On the role of optimal perturbations in the instability of monochromatic gravity waves. Phys. of Fluids, 17, 094107, [DOI: 10.1063/1.2046709] (pdf)

12. Achatz, U., und G. Schmitz, 2006a: Shear and static instability of inertia-gravity wave packets: Short-term modal and nonmodal growth. J Atmos. Sci., 63, 397-413 (extended pdf)

13. Achatz, U., und G. Schmitz, 2006b: Optimal growth in inertia-gravity wave packets: Energetics, long-term development, and three-dimensional structure. J. Atmos. Sci., 63, 414-434 (extended pdf)

14. Achatz, U., 2007a: The primary nonlinear dynamics of modal and nonmodal perturbations of monochromatic inertia-gravity waves. J. Atmos. Sci., 64, 74-95 (pdf)

15. Achatz, U., 2006b: Modal and nonmodal perturbations of monochromatic high-frequency gravity waves: Primary nonlinear dynamics, J. Atmos. Sci., 64, 1977- 1994 (pdf)

16. Achatz, U., 2007c: Gravity-wave breaking: Linear and primary nonlinear dynamics. Adv. Space Res., 40, 719-733 (pdf)

17. Achatz, U., N. Grieger, und H. Schmidt, 2008: Mechanisms Controlling the Diurnal Solar Tide: Analysis Using a GCM and a Linear Model. J. Geophys. Res., 113, A08303, doi:10.1029/2007JA012967  (pdf)

18. Achatz, U., R. Klein and F. Senf, 2010:  Gravity waves, scale asymptotics and the pseudo-incompressible equations. J. Fluid Mech., 663, 120-147

19. Achatz, U., F. Senf and N. Grieger, 2012: Solar diurnal tides in the middle atmosphere: Interactions with the zonal mean flow, planetary waves and gravity waves. In Climate and weather
    of the sun-earth system (CAWSES): Highlights from a priority program. Ed. F.-J. Lübken. Springer: Dordrecht.

Referierte Veröffentlichungen (als Koautor)

1. Dröge, W., U. Achatz, W. Wanner, R. Schlickeiser und G. Wibberenz, 1993: Quasi-linear theory and the phenomenology of interplanetary solar particle transport. Astrophys. J., 407, L95-L98

2. Schlickeiser, R. und U. Achatz, 1993: Cosmic-ray particle transport in weakly turbulent plasmas. Part 1. Theory. J. Plasma Physics, 49, 63-77

3. Schlickeiser, R. und U. Achatz, 1993: Cosmic-ray particle transport in weakly turbulent plasmas. Part 2. Mean free path of cosmic-ray protons. J. Plasma Physics, 50, 85-107

4. Klein, U., K.-H. Mack, R. Strom, R. Wielebinski und U. Achatz, 1994: A high-frequency radio continuum investigation of giant radio galaxies. I. Observations of six objects at 2.8 cm wavelength. Astron. Astrophys., 283, 729-744

5. Grieger, N., G. Schmitz, und U. Achatz, 2004: The dependence of the nonmigrating diurnal tide in the mesosphere and lower thermosphere on stationary planetary waves. J. Atmos. Sol.-Terr. Phys., 66, 733-754

6. Klein, R., U. Achatz, D. Bresch, O. M. Knio, P. K. Smolarkiewicz, 2010: Regime of Validity of Soundproof Atmospheric Flow Models . J. Atmos. Sci., 67, 3226–3237

7. Senf, F. and Achatz, U., 2011: On the impact of middle-atmosphere thermal tides on the propagation and dissipation of gravity waves. J. Geophys. Res. 116, D24110, doi:10.1029/2011JD015794

8.   (pdf)

9. Fruman, M. D. and U. Achatz, 2012: Secondary instabilities in breaking inertia-gravity waves. J. Atmos. Sci. 69, 303-322   (pdf)

Konferenzbeiträge und andere Manuskripte

1. Achatz, U., H. Lesch und R. Schlickeiser, 1990: Radiogaps: Stability of electron/positron jets in large-scale magnetic fields, in Galactic and Intergalactic Magnetic Fields, Proc. IAU Symp. No. 140, Hrsg. R. Beck, P. Kronberg und R. Wielebinski (Kluwer Academic Publishers: Dordrecht), S. 43

2. Achatz, U., H. Lesch und R. Schlickeiser, 1991: Jets and Hotspots in Extragalactic Radio Sources, in Relativistic Hadrons in Cosmic Compact Objects, Hrsg. A. A. Zdziarski und M. Sikora (Springer: Heidelberg), 73-77

3. Achatz, U., W. Dröge, R. Schlickeiser und G. Wibberenz, 1991: Interplanetary transport of solar cosmic rays, 22nd International Cosmic Ray Conference, 3, 240-243

4. Achatz, U. und J. Steinacker, 1991: Charged particle transport in a turbulent magnetized plasma, 22nd International Cosmic Ray Conference, 2, 213,216

5. Achatz, U., G. Schmitz und K.-M. Greisiger, 1994: Principal interaction patterns in baroclinic wave life cycles. Proc. The Life Cycles of Extratropical Cyclones, Hrsg. S. Gronas und M. A. Shapiro, Bergen, 2, 110-115

6. Achatz, U. und G. Schmitz, 1995: Towards the development of a PIP model for atmospheric data. Proc. 6th International Meeting on Statistical Climatology, University College, Galway, Ireland, 115-118

7. Achatz, U. und G. Schmitz, 1995: Ein PIP-Modell für die Analyse atmosphärischer Daten. Ann. Meteorol., 31, 21-22

8. Achatz, U. und G. Schmitz, 1997: On the closure problem in the reduction of complex atmospheric models by PIPs and EOFs: A comparison for the case of a two-layer model with zonally symmetric forcing. Proc. 11th Conference on Atmospheric and Oceanic Fluid Dynamics, Tacoma, WA, Hrsg. C.S. Bretherton, 129-133

9. Achatz, U., S. Schleiff und G. Schmitz, 1998: Selbstkonsistente Modellierung des niederfrequenten Anteils der Atmosphärendynamik mittels empirischer Modelle. Ann. Meteorol.

10. Achatz, U. und G. Branstator, 1998: A quasi-geostrophic model with empirical linear corrections and reduced order for climate simulations. Proc. The Rossby-100 Symposium, Stockholm, University of Stockholm, 20-22

11. Achatz, U. und J. D. Opsteegh, 2001: Condensed representation of atmospheric dynamics by using its essential degrees of freedom in a primitive equation model. Proc. 13th Conference on Atmospheric and Oceanic Fluid Dynamics, Breckenridge, CO, Hrsg. Black, R.X. und S. Lee, 34-36

12. Achatz, U., 2003: The propagation of small-scale gravity waves in a slowly varying background field. Proc. 14th AMS Conference on Geophysical Fluid Dynamics, San Antonio, TX, Hrsg. Magnusdottir, G., und R. Saravanan, 113-115

13. Achatz, U., 2006: The primary nonlinear dynamics of modal and nonmodal perturbations of monochromatic inertia-gravity waves. Proc. Workshop on Mathematical Theory and Modelling in  Atmosphere-Ocean Science, Mathematisches Forschungs-Institut Oberwolfach, ed. Bühler, O., Majda, A., und R. Klein, 58-60

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