Space Science Center
National Institute of Aeronautics and Space
LAPAN - Indonesia











Issued : 2017 October 18 0800 UTC
Forecast Valid For 24 Hours

Detailed Information

Solar Activity

Solar activity is currently on very quiet condition with no flare and no solar radio burst detected in the last 24 hours. Today's observation from SDO HMI Intensitygram shows spotless solar disk. There was one  CME hurled to the east based on CACTUS detection and SOHO/LASCO C2 observation, most likely from the farside. There will be two new active regions are expected to emerge from the east solar limb in the next 24 hours based on STEREO EUVI/AIA195 observations, previously designated as NOAA 2682 & NOAA 2683. 

Based on today solar activities, thus the solar activity on October 18, 2017, starting from 08:00 UT is predicted to remain on quiet level, valid for the next 24 hours.

Geomagnetic Activity

In the last 24 hours, geomagnetic activity was on quiet level.                                                                                                              

Today's geomagnetic activity was on quiet level. Solar wind speed was decreased from 500 km/s to 410 km/s. IMF was varied between -3 to 3 nT. Both of today's coronal holes on northern pole elongated to northwestern hemisphere and around central equator were geoeffective while the other ones on equator and southern pole were not. The latest substorm was begin on October 17th, 2017 around 08 UT with intensity less than 500 nT and has taken 10 hours of duration.

Quiet level is expected for the next 24 hours.

Ionosphere Activity

Ionosphere was in minor conditions for the last 24 hours.

There was a depression of foF2 lower than 30% from its median values for 30 menits. There was no increment of fmin more than 30% from its median values. There was no Spread-F event. The Sporadic-E occurred in day and night time with foEs values were more than foF2 for several times. The W-index mean value was +1. Ionospheric scintillations  were moderate over Bandung with S4 index values were more than 0.25 but less than 0.5.

The ionosphere activity is predicted to be quiet for the next 24 hours.


The Error positioning was normal with W-index value was +1 for the last 24 hours.

The probability of error positioning for next the 24 hours is normal during daytime and nighttime based on W-index prediction value is going to be -1.

HF Radio Communication

MUF depression was in minor condition and Short Wave Fadeout (SWF) was in quiet condition for the last 24 hours.

The probability of MUF depression for next the 24 hours is quiet due to previous and prediction of geomagnetic activity.

The probability of SWF  for next the 24 hours is quiet due to the prediction of solar flare activities.


Today's Electron flux was around 10000 [/cm2/sec/sr] or in Very High level.                                        
Very High electron flux is expected for the next 24 hours.

Within the last 24 hours, the flux of high-energy proton is in quiet level due to low solar activity. 
The flux of high-energy proton on October 18 2017 starting from 08:00 UT is predicted to remain quiet, valid for 24 hours.