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Information for radio communication
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Current condition of geomagnetic activity   地磁気嵐レベル
Update :2016/09/07 13:00:00 (UT)

deficit or updating
Related data: plotsGraf plots

Current condition of SWF   Level
Update :2018/06/18 03:40:00 (UT)

A map presents SWF (by NICT Space Environment Group) No SWF
Related data: plotsGraf plots
A map presents SWF (by NICT Space Environment Group)

Current condition of Es in Japan  
Update :2018/06/18 03:45:00 (UT)

Map Wakkanai : Critical Frequency:5.9[MHz]
Kokubunji : Critical Frequency:14.1[MHz]
Yamagawa : Critical Frequency:7.5[MHz]
Okinawa : deficit or updating

Current condition of ionsphere (by NICT Space Weather Group)
Geomagnetic activity:
Critical frequency of F-layer decreases in association with geomagnetic storms. This effect depends on seasons and is pronounced in summer season.
SWF (Dellinger effect):
X-ray and UV emmisions from solar flares ionize the D-layer of the day-side ionosphere, causing the interuption of radio communications due to the absorption of HF radio waves at the D-layer.
Sporadic E-layer (Es):
Sparadic E-layer (Es) is a thin layer of high electron density emerging "sporadically" at the height of the usual E-layer. Es often appears in summer season.

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X-ray by GOES
X-ray by GOES ©NOAA/SWPC

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