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Marco Dalla Tiezza
2024-06-09 15:17:29 +02:00
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space_weather/current/index.html
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</li>
<li class="md-nav__item">
<a href="#2-a-index" class="md-nav__link">
<a href="#2-ap-index" class="md-nav__link">
<span class="md-ellipsis">
2. A Index
2. Ap Index
</span>
</a>
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</li>
<li class="md-nav__item">
<a href="#2-a-index" class="md-nav__link">
<a href="#2-ap-index" class="md-nav__link">
<span class="md-ellipsis">
2. A Index
2. Ap Index
</span>
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</tr>
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<h2 id="2-a-index">2. A Index</h2>
<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>
<h2 id="2-ap-index">2. Ap Index</h2>
<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 Ap values (3-hour) and using the same stations grid explained for the Kp index in the previous section. This provides a measure of geomagnetic activity for a specific day. Days with higher levels of geomagnetic activity correspond to higher daily Ap values.</p>
<h2 id="3-noaa-space-weather-scale">3. NOAA Space Weather Scale</h2>
<h3 id="geomagnetic-storm">Geomagnetic Storm</h3>
<details class="danger">