Mirror mode waves in Venus’s magnetosheath: solar minimum vs. solar maximum
نویسندگان
چکیده
The observational rate of mirror mode waves in Venus’s magnetosheath for solar maximum conditions is studied and compared with previous results for solar minimum conditions. It is found that the number of mirror mode events is approximately 14 % higher for solar maximum than for solar minimum. A possible cause is the increase in solar UV radiation, ionizing more neutrals from Venus’s exosphere and the outward displacement of the bow shock during solar maximum. Also, the solar wind properties (speed, density) differ for solar minimum and maximum. The maximum observational rate, however, over Venus’s magnetosheath remains almost the same, with only differences in the distribution along the flow line. This may be caused by the interplay of a decreasing solar wind density and a slightly higher solar wind velocity for this solar maximum. The distribution of strengths of the mirror mode waves is shown to be exponentially falling off, with (almost) the same coefficient for solar maximum and minimum. The plasma conditions in Venus’s magnetosheath are different for solar minimum as compared to solar maximum. For solar minimum, mirror mode waves are created directly behind where the bow shock will decay, whereas for solar maximum all created mirror modes can grow.
منابع مشابه
Mirror modes observed with Cluster in the Earth ’ s magnetosheath : statistical study and IMF / solar wind dependence
We present a statistical analysis of 5 years of Cluster mission data in the magnetosheath. Our primary focus is to exhibit the spatial distribution of mirror mode events. The automatized detection is based on Minimum Variance Analysis and the amplitude of events. The results are displayed in the GIPM reference frame to enable comparison with a previous similar study using ISEE-1 data. These res...
متن کاملLow-frequency waves in the Martian magnetosphere and their response to upstream solar wind driving conditions
We characterize low-frequency plasma waves in the Martian magnetosphere and in the upstream region by using transport ratios. To compute the transport ratios, we use Mars Atmosphere and Volatile EvolutioN mission’s (MAVEN) solar wind ion analyzer and suprathermal and thermal ion composition instrument measurements of the ion moments and the magnetometer measurements of the magnetic field. We fi...
متن کاملManufacturing a trough parabolic solar collector and predicting its theoretical performance
The aim of this research was manufacturing a parabolic trough solar collector in which reflecting surface is made of mirror steel rather than usual mirror and also predicting its theoretical performance.by adjusting planar ⩝ -shaped structures parallel to each other and welding them together, the main supporting structure was assembled and a parabolic-shape Teflon arc was installed in the apert...
متن کاملStatistical Study of Correlation Length of Magnetosheath Fluctuations
The paper presents a statistical study of mutual relationship of ion density and magnetic field fluctuations measured by Cluster near the dusk-dawn meridian at the magnetosheath in the vicinity of the magnetopause. In this region, we have found that the correlation length of such fluctuations does not exceed ≈1 RE in the analyzed frequency range of 0.001–0.125 Hz. The fluctuations have often sh...
متن کاملThe magnetosheaths of the outer planets
This paper provides a review of past work on the magnetosheaths of the outer planets and also provides the most complete look to date at the plasma parameters in these magnetosheaths. We (nd that proton distributions in the magnetosheaths of Jupiter, Saturn, and Neptune (but not Uranus) are well represented by two Maxwellians with the same velocity but di/erent temperatures. The hot proton comp...
متن کامل