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











Issued : 2018 May 22 0800 UTC
Forecast Valid For 24 Hours

Detailed Information

Solar Activity

Solar activitiy was on the quiet level. Neither flare, CME nor solar radio burst occurred in the last three days. Today's observation from SDO/HMI Intensitygram shows one new region NOAA 2710 on east limb that is simple and quiet.  Based on STEREO EUVI/AIA195 observation, no new active region is predicted to appear from the east limb in the next 24 hours. 

Based on today's condition, the solar activity is predicted to be quiet for the next 24 hours.

Geomagnetic Activity

The geomagnetic activitiy was on quiet level.

Today's geomagnetic activity was on quiet level. Solar wind speed  fluctuated from 290 to 500 km/s. IMF was varied between -3 to +2 nT. Today's geoeffective coronal hole was at north pole that elongated to north equator while the one at south pole was not geoeffective. There is no substorm occurence in the last 24 hours.

Quiet level is expected for the next 24 hours.

Ionosphere Activity

Ionosphere was in minor condition.

There was  depression of foF2 lower than 30% of its median values for almost 2 hours. There was no increment of fmin more than 30% of its median values. There was  Spread-F events  for almost 3 hours.  The Sporadic-E occurred in the daytime and night time with foEs value mostly under  foF2. The W-index mean value was -3. The S4 index values (condition scintillation ionosphere)  was between 0.25 to  0.5 over Bandung at approximately 8:30 UT but less than 0.25 over Biak.

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


The error positioning was medium based on W-index value -3.

The probability of error positioning for the next 24 hours is slight during daytime and nighttime based on W-index value that going to be -2.

HF Radio Communication

MUF depression was in moderate condition and Short Wave Fadeout (SWF) was in quiet condition.

  • 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 activitiy.


Today's electron flux was around 800 particles/ or in the low level. Low electron flux is expected for the next 24 hours.

In the last 24 hours, the flux of high-energy proton was in the quiet level due to low solar activity. Based on today's condition, the flux of high-energy proton is predicted to be quiet for the next 24 hours.