Revisiting the Question: The Cause of the Solar Cycle Variation of Total Solar Irradiance

<div>Wavelet coherence of the daily TSI and sunspot area. The dashed black line indicates the COI where edge effects might distort the picture, and the 95% confidence level is shown as a thick contour, which is estimated by Monte Carlo method. The relative phase relation is shown as arrows (with in-phase pointing right, antiphase pointing left, and TSI leading sunspot area by <svg height="11.0031pt" id="M54" style="vertical-align:-0.2064009pt" version="1.1" viewbox="-0.0498162 -10.7967 16.6412 11.0031" width="16.6412pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M244 635C114 635 38 519 38 422C38 317 111 240 217 240C236 240 255 244 277 256L345 292C311 140 203 39 59 15L64 -15C89 -15 150 -5 204 17C339 72 440 202 440 386C440 521 368 635 244 635ZM228 602C326 602 352 479 352 390C352 370 351 347 348 324C327 308 293 296 258 296C174 296 124 369 124 458C124 517 152 602 228 602Z"></path></g><g transform="matrix(.013,0,0,-0.013,6.241,0)"><path d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 443 312C443 466 390 635 241 635ZM238 602C329 602 354 454 354 312C354 172 330 22 240 22C152 22 124 173 124 313S148 602 238 602Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,12.527,-5.741)"><path d="M339 262C339 340 273 403 193 403S48 340 48 262S113 121 193 121S339 184 339 262ZM283 262C283 210 242 168 193 168S104 210 104 262S144 356 193 356S283 314 283 262Z"></path></g></svg> pointing straight down).</div>

Advances in Astronomy

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Figure 2

Figure 2: Revisiting the Question: The Cause of the Solar Cycle Variation of Total Solar Irradiance 