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Cycles Research Institute October 2005

Solar variations of 154 days and related periods

The Sun has been found to have a 154 day cycle in gaa!ray flares" proton flares" solar #ind" interplanetary agneticfield" sunspot areas and neutrino output$ %irst reported ingaa ray flares in 1&'4 by Rieger et al" the cycle variesbet#een 140 and 1(0 days and is ost often reported as154 or 155 days$ The cycle is often associated #ith othercycles of periods near 2'" 51" (' and 10) days all of #hichare ultiples of the solar rotation rate of 2* days +or 2'days as seen fro the earth,$ -onger cycles of 1$2' and2$14 years are also entioned as associated" being ) and 5ties the length of the 154 day cycle$

.igh energy Solar flares

/sing daily data fro the Solar aiu ission +S, andthe eosynchronous Operational 3nvironental Satellites+O3S," a 155!) day cycle #as found near the aiuof solar cycle 21$ The period is often reported at solaraiu and tends to disappear at solar iniu$ Thisay be due to using highly s6e#ed data" and the authorsuggests reanalysis #ith log data being used instead$

7$ -$ 8allester" R$ Oliver and $ Carbonell report that thisperiod coincides in tie #ith periodic eergence ofagnetic flu in the for of strong agnetic fields"suggesting a causal relationship$ Their figure is sho#nbelo#$

Solar flu at 12( .9

The ean flu density of the Sun has being onitored atToru: since 1&5' and $ a#ro:s6a and ;$$ 8or6o#s6i

carried out a search for periodicities in the Solar %lu at 12(.9$ They found the 11 year cycle but not the 154 daycycle$ .o#ever other sub!haronics of 25$' days #erefound" including strong spectral pea6s for 51$( days is found1&5'!1&'5" 10)$) days is present in cycles 20 and 21especially 1&*&!1&(* and '0$* days up to 1&'&" especially

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Cycles Research Institute October 2005

odulations of cycles

F S Festerov has reported the spectru of Solar radioeissions at )$(5 .9$ Hs #ell as sho#ing coon periodsof 154 and (( days" there is cople spectral structurearound each of these periods suggesting odulation bylonger cycles$ enerally reports indicate that the cycles are

stronger near solar aiu" so these odulations ay bedue to the ain 11 year solar cycle$ The analysis is basedon s table$

References

Rieger" 3" . Share" 7 %orrest" ;anbach" C Reppin" and 3-$Chupp" Fature" )12" *2)" 1&'4$

DH 154!day periodicity in the occurrence of hard solar flaresE$

8ogart" R S" and 8ai" T 1&'5" Hp$ 7$ +-etters," 2&&" -51$JConfiration of a 152!day =eriodicity in the Occurrence of Solar%lares Inferred fro icro#ave ata>>

8ai" T" and Sturroc6" = H 1&'(" Fature" )2(" *01$JOn the 152!day =eriodicity of the Solar %lare Occurrence RateJ

8ai" T" and Cliver" 3 1&&0" Hp$ 7$" )*)" 2&&$JH 154!ay =eriodicity in the Occurrence Rate of =roton %laresJ

-ean" 7 -" Hstrophys$ 7$" )*)" (1'" 1&&0$ D3volution of the 155 dayperiodicity in the sunspot areas during solar cycles 12 to 22E$

8ai" T" and Sturroc6" = H 1&&1" Fature )50" 141$ JThe 154!day andRelated =eriodicities as Subharonics of a %undaental =eriodJ

Sturroc6" = H" and 8ai" T 1&&2" Hp$ 7$ )&(" ))($ JSearch for 3videnceof a Cloc6 Related to the Solar 154 ay Cople of =eriodicitiesJ

8ai" T 1&&2" Hp$ 7$ -etters )''" -*&$JThe ((!day =eriodicity in the %lare Occurrence Rate of Cycle 22J

8ai" T" and Sturroc6" = H 1&&)" Hp$ 7$ 40&" 4(*$J3vidence for the %undaental =eriod of the Sun@ Its Relation to the154!day Cople of =eriodicitiesJ

Cane" . K" I Robinson" and T T von Rosenvinge" eophys$ Res$-ett$" 25" 44)(!4440" 1&&'

DInterplanetary agnetic field periodicity of G 15) daysE

http@ne#s!service$stanford$edune#s1&&'s otion around the Sun" 2' days isreported rather than 2* days$

The 12)' day cycle accurately atches 3d#ard R$e#ey>s deterination of 40$*' onths for the stoc6ar6et cycle" #hile the *1& day cycle atches theauthor>s deterination of a 1$*&5 year cycle in #heatprices$ This haronic atching of seeingly unrelatedcycles is a feature coonly reported by 3d#ard Re#ey$

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