Welcome to the
home page of Ham Radio Station OR7K
Primary call ON4JZ
Ex callsigns ON1BZJ - ON4AJZ - OP4K
|
QSL routing - first choices are digital (no charge and fast) then bureau and if you wish direct (quiet expensive nowadays) |
|||
| 1. LOTW | 2. EQSL | 3. BUREAU | 4. DIRECT |
 |
 |
 |
 |
ZIEGELSHIFFER
Joe
Antwerp
BELGIUM
WW locator JO21FF
GPS coordinates
51°12'35.28"N 4°25'47.45"E
Member of (click
on each icon for more information)
Province: Antwerp
(AN)
Section: Antwerp Contest Club (ACC)
What are K and A indexes?
The K-index indicates the size of the irregular changes in the magnetic
field of the earth over a period of 3 hours. This index is calculated on the
basis of values measured by an observation station, wherein the location
(relative to the magnetic pole) of the station is taken into account. These
observations are made by many observatories.
The scale of the index K is
quasi-logarithmic scale, and the number increases with the size (from 0 to
9) of the disturbance of the magnetic field.
The A-indices may vary in value from 0 to 400, and are derived by means of
the K-indices a table of equivalence as follows:
| K | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| A | 0-2 | 3-5 | 6-10 | 11-20 | 21-35 | 36-61 | 62-102 | 103-166 | 167-268 | >269 |
There is also a conversion of these indices by "name":
| A-index | K-index | Name |
| 0-7 | 0-1 | Quiet |
| 8-15 | 2-3 | Unsettled |
| 16-29 | 4 | Active |
| 30-49 | 5 | Minor Storm |
| 50-99 | 6 | Major Storm |
| 100-400 | 7-9 | Severe Storm |
© Ziegelshiffer Joe OP4K 2024 - Last update January 13, 2025