Detailed Information

Solar Activity

Solar activity was eruptive over the past 24 hours. 

Six C-class solar flares were observed, with no M-class or X-class flares detected. The strongest event was a C5.7 flare, peaking at 18:32UT, originating from NOAA 14409. Associated with this activity, one type-III solar radio burst was reported, while no type-II or IV radio bursts were observed. Furthermore, no coronal mass ejections were observed during this period. On the visible disk, eight active regions were identified by SDO/HMI: NOAA 14404, NOAA 14405, NOAA 14406, NOAA 14408, NOAA 14409, NOAA 14412, NOAA 14413, and NOAA 14414. Additionally, two H-Alpha plages were observed by BBSO, identified as NOAA 14407 and NOAA 14411. Looking ahead, one active region is due to return between 08 Apr and 10 Apr.

The solar activity for the next 24 hours is predicted to be eruptive with maximum flare class of C.

Geomagnetic Activity

The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed decrease from 594 km/s to 460 km/s, north-south component of interplanetary magnetic field fluctuate between -5.0 nT and 4.8 nT. Coronal holes at eastern equator, south pole, north pole, north-west and south-east were not geoeffective.

Active level geomagnetic activity is expected for the next 24 hours.

Ionospheric Activity

Ionosphere was on quiet level for the last 24 hours.

There was no depression of foF2 lower than 30% of its median value. There was 45 minutes increment of fmin more than 30% of its median values. The Spread-F was detected for 120 minutes for the last 24 hours. There was 1050 minutes Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times. The S4 index values (condition of ionospheric scintillation ) was less than 0.5 (quiet) and the maximum TEC index value was at 82.33, both over Pontianak.

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

Navigation

Based on TEC and scintillation, the error of the single-frequency GPS positioning for the last 24 hours was at a normal level.

Based on ionospheric scintillation and TEC variation, the probability of error positioning for the next 24 hours is predicted at a normal level.

HF Radio Communication

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

The MUF depression for the next 24 hours is predicted on a quiet level, due to previous geomagnetic activity.

The SWF for the next 24 hours is predicted at a quiet level due to the prediction of a solar flare.

Satellites

The electron flux was on high level for the last 24 hours.

High level of electron flux is expected for the next 24 hours.

The 10 MeV proton flux in quiet condition over the past 24 hours. 
Based on these conditions, the proton flux is predicted to remain quiet for the next 24 hours.