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<p><img alt="sw_current" src="../../assets/sw_1.webp" /></p>
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<p><img alt="sw_current" src="../../assets/sw_1.webp" /></p>
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<h2 id="1-kp-index">1. Kp Index</h2>
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<h2 id="1-kp-index">1. Kp Index</h2>
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<p>The <strong>K index</strong> is a number (from 0 to 9) that shows how much Earth's magnetic field is disturbed. A K index of 1 means things are calm, while a K index of 5 or higher indicates a geomagnetic storm. These disturbances are measured with magnetometers that track changes in Earth's magnetic field every three hours. The K itself comes from a German word "Kennziffer" meaning "characteristic digit". To get a big picture of what's happening around the world, an official planetary <strong>Kp index</strong> is calculated. This is done by averaging the K indices from a special network of 13 geomagnetic observatories located around the globe at mid-latitudes.</p>
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<p>The <strong>K index</strong> is a number (from 0 to 9) that shows how much Earth's magnetic field is disturbed. A K index of 1 means things are calm, while a K index of 5 or higher indicates a geomagnetic storm. These disturbances are measured with magnetometers that track changes in Earth's magnetic field every three hours. The K itself comes from a German word "Kennziffer" meaning "characteristic digit". To get a big picture of what's happening around the world, an official planetary <strong>Kp index</strong> is calculated. This is done by averaging the K indices from a special network of 13 geomagnetic observatories located around the globe at mid-latitudes.</p>
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<table>
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<thead>
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<tr>
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<th>Index</th>
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<th>Activity Level</th>
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<th>High Latitudes</th>
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<th>Low Latitudes</th>
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<th>Possible Source</th>
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<td><strong>Kp 0</strong></td>
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<td>Inactive</td>
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<td>Weak & slow aurora possible</td>
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<td>Aurora extremely unlikely</td>
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<td>Small influx of particles due to some reconnections mostly at the magnetotail</td>
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</tr>
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<td><strong>Kp 1</strong></td>
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<td>Very Quiet</td>
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<td>Weak & slow aurora likely</td>
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<td>Aurora very unlikely</td>
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<td>Vide supra</td>
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</tr>
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<td><strong>Kp 2</strong></td>
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<td>Quiet</td>
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<td>Moderate auroral display</td>
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<td>Aurora unlikely</td>
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<td>Vide supra</td>
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</tr>
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<tr>
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<td><strong>Kp 3</strong></td>
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<td>Unsettled</td>
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<td>Active auroral display, sporadic substorm possible</td>
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<td>Weak aurora display possible</td>
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<td>Coronal hole sending fast winds or remains after days of storming, enhanced solar wind</td>
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</tr>
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<td><strong>Kp 4</strong></td>
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<td>Active</td>
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<td>Active auroral display, multiple sporadic substorms possible</td>
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<td>Weak Aurora Display Possible</td>
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<td>Vide supra</td>
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</tr>
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<tr>
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<td><strong>Kp 5</strong></td>
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<td>Minor Storm (G1)</td>
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<td>Very active auroral display, multiple substorms likely</td>
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<td>Aurora display likely</td>
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<td>Coronal hole sending fast winds or coronal mass ejection (CME), enhanced solar wind</td>
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</tr>
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<td><strong>Kp 6</strong></td>
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<td>Moderate Storm (G2)</td>
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<td>Strong auroral display, longer substorms</td>
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<td>Active auroral display very likely</td>
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<td>Vide supra</td>
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</tr>
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<tr>
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<td><strong>Kp 7</strong></td>
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<td>Strong Storm (G3)</td>
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<td>Very strong auroral display</td>
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<td>Strong auroral display extremely likely</td>
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<td>Large CMEs caused by solar storms or flares, very enhanced solar wind with strong shock wave</td>
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</tr>
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<tr>
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<td><strong>Kp 8</strong></td>
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<td>Severe Storm (G4)</td>
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<td>Extremely strong aurora, long periods of substorming</td>
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<td>Strong auroral display extremely likely</td>
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<td>Vide supra</td>
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</tr>
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<tr>
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<td><strong>Kp 9</strong></td>
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<td>Extreme Storm (G5)</td>
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<td>Extremely strong aurora, long periods of substorming</td>
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<td>Very strong auroral display, overhead aurora possible</td>
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<td>Super CMEs, Carrington-class events, devastating solar wind with extreme shock waves</td>
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</tr>
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</tbody>
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</table>
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<h2 id="2-a-index">2. A Index</h2>
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<h2 id="2-a-index">2. A Index</h2>
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<p>The <strong>A index</strong> represents the three-hourly equivalent amplitude of geomagnetic activity at a specific magnetometer station, derived from the station-specific K index. Due to the quasi-logarithmic nature of the K-scale in relation to magnetometer fluctuations, directly averaging a set of K indices is not really meaningful. Instead each K is converted back into a linear scale. The <strong>Ap index</strong> is determined by averaging the eight daily A values, providing a measure of geomagnetic activity for a specific day. Days with higher levels of geomagnetic activity correspond to higher daily Ap values.</p>
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<p>The <strong>A index</strong> represents the three-hourly equivalent amplitude of geomagnetic activity at a specific magnetometer station, derived from the station-specific K index. Due to the quasi-logarithmic nature of the K-scale in relation to magnetometer fluctuations, directly averaging a set of K indices is not really meaningful. Instead each K is converted back into a linear scale. The <strong>Ap index</strong> is determined by averaging the eight daily A values, providing a measure of geomagnetic activity for a specific day. Days with higher levels of geomagnetic activity correspond to higher daily Ap values.</p>
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<h2 id="3-noaa-space-weather-scale">3. NOAA Space Weather Scale</h2>
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<h2 id="3-noaa-space-weather-scale">3. NOAA Space Weather Scale</h2>
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