Interplanetary radio storms. II - Emission levels and solar wind speed in the range 0.05-0.8 AU
Interplanetary radio storms. II - Emission levels and solar wind speed in the range 0.05-0.8 AU
复制标题
行星际射电风暴。
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
R. Stone
中科院分区：
文献类型：
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作者：
J. Bougeret;J. Fainberg;R. Stone
星际III型射电暴（IP Storms）通常是由ISEE-3无线电仪器在星际介质中观测到的。该仪器具有准确测定射电发射到达方向的能力。在每一个观测频率上，当风暴射电源穿过视线到达太阳时，都会被跟踪。使用一个简单的模型，在四个不同的风暴的若干无线电频率上确定了辐射水平。在0.05至0.8 AU水平的密度增强区域发现了IP风暴辐射。这些增强中的密度比R（-2）下降得更快。还测量了风暴区的太阳风速度。分析结果与风暴区域在风暴经过中央子午线附近几天内的稳定条件相一致。与HELIOS 1-2观测所得的平均原位密度测量结果比较，III型风暴爆发的射电辐射在局部等离子体频率的谐波上更有利。
Storms of interplanetary type III radio bursts (IP storms) are commonly observed in the interplanetry medium by the ISEE-3 radio instrument. This instrument has the capability of accurately determining the arrival direction of the radio emission. At each observing frequency, the storm radio sources are tracked as they cross the line-of-sight to the Sun. Usng a simple model, the emission levels are determined at a number of radio frequencies for four separate storms. The IP storm radiation is found to occur in regions of enhanced density at levels of 0.05 to 0.8 AU. The density in these enhancements falls off faster than R(-2). The solar wind speed in the storm region is also measured. The analysis is consistent with steady conditions in the storm region during a few days around the central meridian passage of the storm. The comparison with average in situ density measurements compiled from the HELIOS 1-2 observations favors type III storm burst radio emission at the harmonic of the local plasma frequency.