Interplanetary magnetic field power spectra with frequencies from 2.4 x 10^-5 Hz to 470 Hz from HELIOS-observations during solar minimum conditions
Article Sidebar
Main Article Content
Abstract
By using data from the Technical University of Braunschweig flux-gate and search-coil magnetometer experiments on board of Helios 2 we study the spectral properties of the interplanetary magnetic field over a frequency range from 2.4 x 10-5 Hz up to 470 Hz. Examples of power spectral density estimates at different heliocentric distances are shown as well as the change of the spectra during the progress of a high speed stream. A general feature of the spectra is that in a log-log spectral representation the steepness of the power spectral density estimates varies as a function of frequency. If we relate the spectral densities by a power law P ∼ f –α, the spectral index α increases with increasing frequency. At 1 AU α varies on average from 1.6 to 3.4 and at 0.3 AU from 1.0 to 3.4, the major changes in the spectral index occurring at low frequencies. In addition, just within the frequency gap between the two experiments, between 2Hz and 4.7 Hz, an inflexion point is inferred from the spectrum above and below this frequency range. This spectral feature can at least partly be attributed to the damping of the Alfven-mode waves near the proton and also α-particle cyclotron frequencies. The observed power spectra are compared with models of MHD turbulence and it is found that at least some of the properties of MHD turbulence fit the observations remarkably well.
ARK: https://n2t.net/ark:/88439/y063880
Permalink: https://geophysicsjournal.com/article/70
Article Details
Authors who publish with this journal as of Vol. 63 agree to the following terms:
a. Authors share the copyright with this journal in equal parts (50% to the journal, 50% to the lead author), and grant the journal right of first publication, with the work after publication simultaneously licensed under Creative Commons Attribution License CC BY-NC-ND 4.0 that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
b. Authors may enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal, and a reference to this copyright notice.
c. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) during the submission process, as this can lead to productive exchanges and earlier and greater citation of published work and better sales of the copyright.
Author Self-archiving
Authors retain copyright and grant the Journal of Geophysics right of first publication, with the work three years after publication simultaneously licensed under the Creative Commons BY-NC-ND 4.0 License that allows others to share the work (with an acknowledgment of the work's authorship and initial publication in this journal), except for commercial purposes and for creating derivatives.
Authors can enter into separate, additional, but non-commercial contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository, but not publish it in a book), with an acknowledgment of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) before and during the submission process, as that can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
Additional Notes
This journal is one of a handful of scholarly journals that publish original scientific works under CC BY-NC-ND 4.0 - the only Creative Commons license affording the authors' intellectual property absolute worldwide protection.
Journal of Geophysics is published under the scholar-publishers model, meaning authors do not surrender their copyright to us. Instead, and unlike corporate publishers like Elsevier or Springer Nature that resell copyright to third-parties for up to $80,000 (per paper, per transaction!), the Journal of Geophysics authors share copyright equally with this journal.
Therefore, all the proceeds from reselling copyright to third parties get shared to equal parts (50% to the journal, 50% to the lead author). Under the Berne Convention, this protection is an inheritable right that lasts for as long as the rightsholder lives + 50 years.
By submitting to this journal, the lead author, on behalf of all co-authors, grants permission to this journal to represent all co-authors in negotiating copyright sales and collecting proceeds. The lead author should negotiate with his/her co-authors the modalities of distributing the lead author's portion of the proceeds. Usually, this is per pre-agreed percentage of each co-author's contribution to creating the copyrighted work. (more...)
References
Barnes, A. (1979) Hydromagnetic waves and turbulence in the solar wind. Solar and solar wind plasma physics, Vol. 1, E.N. Parker, C. F. Kennel, and L.J. Lanzerotti (Eds.), pp. 249-319. North Holland Publ. Comp.
Bavassano, B., Dobrowolny, M., Mariani, F., Ness, N.F. (1982) Radial evolution of power spectra of interplanetary Alfvenic turbulence. J. Geophys. Res. 87:3617-3622
Behannon, K.W. (1976) Observations of the interplanetary magnetic field between 0.46 and 1 AU by the Mariner 10 spacecraft. NASA X-692-76-2
Behannon, K.W. (1978) Heliocentric distance dependence of the interplanetary magnetic field. Rev. Geophys. Space Phys. 16:125-146
Beinroth, H.J., Neubauer, F.M. (1981) Properties of whistler-mode waves between 0.3 and 1.0 AU from Helios observations. J. Geophys. Res. 86:7755-7760
Bendat, J.S., Piersol, A.G. (1971) Random data: Analysis and measurement procedures. New York: Wiley-Interscience
Burlaga, L.F., Turner, J.B. (1976) Microscale "Alfven waves" in the solar wind at 1 AU. J. Geophys. Res. 81:73-77
Busnardo-Neto, J., Dawson, J., Kaminura, T., Lin, A.T. (1976) Ion-cyclotron resonance heating of plasmas and associated longitudinal cooling. Phys. Rev. Lett. 36:28-31
Cohen, R.H., Dewar, R.L. (1974) On the backscatter instability of solar wind Alfven waves. J. Geophys. Res. 79:4174-4178
Coleman, P.J. Jr. (1968) Turbulence, viscosity, and dissipation in the solar wind plasma. Astrophys. J. 153:371-388
Cuperman, S., Sternlieb, A. (1975) The relaxation of strongly anisotropic magnetized plasmas by electromagnetic ion-cyclotron instability. Plasma Phys. 17:699-705
Davidson, R.C., Ogden, J.M. (1975) Electromagnetic ion-cyclotron instability driven by ion energy anisotropy in high-beta plasmas. Phys. Fluids 18:1045-1050
Dehmel, G., Neubauer, F.M., Lukoschus, D., Wawretzko, J., Lammers, E. (1975) Das Induktionsspulen-Magnetometer-Experiment (E4). Raumfahrtforschung 19:241-244
Denskat, K.U. (1975) Wellen im solaren Wind im Frequenzbereich des Helios-Induktionsspulenexperimentes E4 und deren Dopplerverschiebung. Forschungsbericht W 75-18 des Bundesministeriums ftir Forschung und Technologie
Denskat, K.U., Burlaga, L.F. (1977) Multispacecraft observations of microscale fluctuations in the solar wind. J. Geophys. Res. 82:2693-2704
Denskat, K.U., Neubauer, F.M., Schwenn, R. (1981) Properties of Alfvenic fluctuations near the sun: Helios-1 and Helios-2. Proc. of the 4th Solar Wind Conference, Burghausen, F.R.G., Rep. No. MPAE-W-100-81-31:392-397
Denskat, K.U., Neubauer, F.M. (1982) Statistical properties of low frequency magnetic field fluctuations in the solar wind from 0.29 to 1.0 AU during solar mm1mum conditions: Helios-1 and Helios-2. J. Geophys. Res. 87:2215-2223
Dobrowolny, M. (1977) Velocity shear instabilities in high-beta collisionless plasmas. II N uovo Cim. 37:113-130
Dobrowolny, M., Mangenay, A., Veltri, P. (1980a) Properties of magnetohydrodynamic turbulence in the solar wind. Astron. Astrophys. 83:26-32
Dobrowolny, M., Mangenay, A., Veltri, P. (1980b) Fully developed asymmetric hydromagnetic turbulence in the interplanetary space. Phys. Rev. Lett. 45:144-147
Gary, S.P., Feldman, W.C. (1978) A second order theory for k||B0 electromagnetic instabilities. Phys. Fluids 21:72-80
Gurnett, D.A., Frank, L.A. (1978) Ion acoustic waves in the solar wind. J. Geophys. Res. 83:58-74
Hedgecock, P.C. (1975a) A correlation technique for magnetometer zero level determination. Space Sci. lustrum. 1:83-90
Hedgecock, P.C. (1975b) Measurements of the interplanetary magnetic field in relation to the modulation of cosmic rays. Solar Phys. 42:497-527
Jenkins, G.M., Watts, D.G. (1968) Spectral analysis and its application. San Francisco, California, Holden-Day
Kraichnan R.H. (1965) Inertial-range spectrum of hydromagnetic turbulence. Phys. Fluids 8:1385-1387
Kurth, W.S., Gurnett, D.A., Scarf, F.L. (1979a) High-resolution spectrograms of ion acoustic waves in the solar wind, J. Geophys. Res. 84:3413
Kurth, W.S., Ashour-Abdalla, M., Frank, L.A., Kennel, C.F., Gurnett, D.A., Sentman, D.D., Burek, B.G. (1979b) A comparison of intense electrostatic waves near fUHR with linear instability theory. Geophys. Res. Lett. 6:487-490
Livshits, M.A., Tsytovich, V.N. (1970) The spectra of magnetohydrodynamic turbulence in collisionless plasma. Nucl. Fus. 10:241-250
Marsch, E., Muhlhauser, K.H., Schwenn, R., Rosenbauer, H., Philipp, W., Neubauer, F.M. (1982a) Solar wind protons: Threedimensional velocity distributions and derived plasma parameters measured between 0.3 and 1 AU. J. Geophys. Res. 87:52-71
Marsch, E., Muhlhauser, K.H., Rosenbauer, H., Schwenn, R., Neubauer, F.M. (1982b) Solar wind helium ions: Observations of the Helios probes between 0.3 and 1 AU. J. Geophys. Res. 87:35-51
Montgomery, D.C., Tidmann, D.A. (1964) Plasma kinetic theory. New York: McGraw-Hill
Musmann, G., Neubauer, F.M., Maier, A., Lammers, E. (1975) Das Forstersonden-Magnetfeldexperiment (E2). Raumfahrtforschung 19:232-237
Neubauer, F.M., Beinroth, H.J., Barnstorf, H., Dehmel, G. (1977a) Initial results from the Helios 1 search coil magnetometer experiment. J. Geophys. 42:599-614
Neubauer, F.M., Musmann, G., Dehmel, G. (1977b) Fast magnetic fluctuations in the solar wind: Helios 1. J. Geophys. Res. 82:3201-3212
Neubauer, F.M., Barnstorf, H., Beinroth, H.J., Denskat, K.U., Musmann, G., Ruprecht, H., Volkmer, P. (1981) Routineverarbeitung und physikalische Interpretation der MeBdaten des Fi:irstersondenmagnetometers (E2) und des Induktionsspulenmagnetometers (E4) der Raumsonden Helios 1 und Helios 2. Forschungsbericht W 81-039 des Bundesministeriums fi.ir Forschung und Technologie
Sari, J.W., Valley, G.C. (1976) Interplanetary magnetic field power spectra: Mean field radial or perpendicular to radial. J. Geophys. Res. 81:5489-5499