Active regions and the interplanetary magnetic field
نویسندگان
چکیده
منابع مشابه
Characteristic magnetic field and speed properties of interplanetary coronal mass ejections and their sheath regions
[1] Prediction of the solar wind conditions in near-Earth space, arising from both quasi-steady and transient structures, is essential for space weather forecasting. To achieve forecast lead times of a day or more, such predictions must be made on the basis of remote solar observations. A number of empirical prediction schemes have been proposed to forecast the transit time and speed of coronal...
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The motion of a charged particle in a magnetic dipole has first been studied by Wrmer. The different applications of Stiirmer’s theory to anrorae, cosmic rays and Van Allen radiation belt particles are recalled in an historical perspective. In this paper, we expand the Mrmer theory in order to take into account the effects produced by an additional uniform and stationary interplanetary magnetic...
متن کاملMagnetic field inclination and atmospheric oscillations above solar active regions
Recent observational evidence for magnetic field direction effects on helioseismic signals in sunspot penumbrae is suggestive of magnetohydrodynamic (MHD) mode conversion occurring at lower levels. This possibility is explored using wave mechanical and ray theory in a model of the Sun’s surface layers permeated by uniform inclined magnetic field. It is found that fastto-slow conversion near the...
متن کاملSolar Wind Anr Interplanetary Magnetic Field
1. Basic Concepts 2. Sun and Heliosphere at Times of Solar Activity Minimum 2.1. Typical Solar Wind and its Sources 2.2. The Ballerina Model 2.3. Solar Wind Stream Structure 2.4. The Two Basic States of the Solar Wind 2.4.1. Differences 2.4.2. Communities 2.5. Solar Wind Acceleration and Expansion 2.6. Solar Wind Streams and Their Interactions 2.6.1. Corotating Interaction Regions in the Inner ...
متن کاملInterplanetary Magnetic Field Structures out of the Ecliptic
New observations of the out-of-the ecliptic trajectories of type III solar radio bursts have been obtained from simultaneous direction finding measurements on two independent satellite experiments, IMP-6 with spin plane in the ecliptic, and RAE-2 with spin plane normal to the ecliptic. Burst exciter trajectories were observed which originated at the active region and then crossed the ecliptic p...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1968
ISSN: 0074-1809
DOI: 10.1017/s007418090002180x