منابع مشابه
Evolution of Near-Sun Solar Wind Turbulence
This paper presents a preliminary analysis of the turbulence spectrum of the solar wind in the near-Sun region R < 50R⊙, obtained from interplanetary scintillation measurements with the Ooty Radio Telescope at 327 MHz. The results clearly show that the scintillation is dominated by density irregularities of size about 100 − 500 km. The scintillation at the small-scale side of the spectrum, alth...
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The Earth is a planet with a dipolar magnetic field which is agitated by a magnetized plasma wind streaming from the Sun. The magnetic field shields the Earth’s surface from penetrating high energy solar wind particles, as well as interstellar cosmic rays. The magnetic dipole has reversed sign some hundreds of times over the last 400 million years. These polarity reversals correspond to drastic...
متن کاملSolar wind plasma correlations between L1 and Earth
Solar wind plasma data from ISEE 3 at the L1 point and IMP 8 in Earth orbit are compared to determine how well an L1 monitor predicts plasma conditions at Earth. These data cover the time period August 1978 to February 1980, approaching solar maximum. Data are divided into 6-hour blocks, time shifted to compensate for the radial separation of the spacecraft, and interpolated to provide identica...
متن کاملThe 13.5-day periodicity in the Sun, solar wind, and geomagnetic activity: The last three solar cycles
We make a detailed analysis of the 13.5-day periodicity of the solar chromosphere, the nearEarth solar wind, interplanetary magnetic field and geomagnetic activity during the last three solar cycles. The 13.5-day periodicity is a real quasi-periodicity whose amplitude varies sizably with time, attaining occasionally values larger than, for example, the amplitude of the 27-day periodicity. In ca...
متن کاملWeaker solar wind from the polar coronal holes and the whole Sun
[1] Observations of solar wind from both large polar coronal holes (PCHs) during Ulysses’ third orbit showed that the fast solar wind was slightly slower, significantly less dense, cooler, and had less mass and momentum flux than during the previous solar minimum (first) orbit. In addition, while much more variable, measurements in the slower, in-ecliptic wind match quantitatively with Ulysses ...
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ژورنال
عنوان ژورنال: Astronomy and Geophysics
سال: 2004
ISSN: 1366-8781,1468-4004
DOI: 10.1046/j.1468-4004.2003.45438.x