scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

More documents

Recommendations

Info

STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The Relation Between Coronal Holes and CMEs During the Rise, Maximum and Declining Phases of the Solar Cycle 23 Mohamed Amaal 1 , Gopalswamy Nat 2 , Jung Hyewon 1 , Makela Pertti 1 , Akiyama Sachiko 1 , Yashiro Seijie 1 , Xie Hong 1 1 The catholic University of America, 2 Goddard Space Flight Center We investigate the influence of coronal holes on the propagation of CM Es through considering both ICM Es categories with and without flux rope structures, i.e. magnetic clouds (M Cs) and non magnetic clouds (non-M Cs), during the three phases of the solar cycle 23 and compare the results obtained with that of the driverless shocks reported previously by Gopalswamy et al., 2009b. The results show that the correlation coefficient in the case of M C events is very high at the rise phase (~0.99), while it is for declining phase ~-0.62. This result confirms the correspondence between the non-radial motion during the rise phase of the solar cycle and the existence of the higher magnetic field strength in the solar regions of the polar coronal holes during this phase. For the maximum phase the correlation coefficient in case of magnetic clouds is ~-0.30. The correlation coefficient values are found to be much less for non magnetic clouds during the three phases; with the highest value turned to be for the declining phase (ccd=-0.2). The difference between measured position angle (M PA) and the influence position angle (FPA) s pointing, (∆ψ), is found to be in the case 3 where the CH is located between the eruption region and disk center ~35o for the non-M Cs in the maximum phase and in case 2 where the disk center is located between the CH and eruption region ~34o for the non-M Cs events in the rise phase which is consistent with the value of ∆ψ for driverless shocks given by Gopalswamy et al., (2009b) (where ∆ψ≤ 37o). These results together with the average influence parameter value (Favd=2.5 G) which is found to be the highest compared to the other two phases and also to the M Cs average values suggest that the non M Cs is resembling in their behavior the driverless shocks (which have been proven by Gopalswamy et al., (2009a,b) to be deflected by the near by CH s away from the Sun-Earth line) and that the non M Cs may have flux rope structure as the M Cs do have but this structure is hidden from observation due to the deflection by CH s. This finding may have bearing on the idea that all CM Es may be flux ropes and the difference is only due to the viewing angle variation.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Influence of Solar Activity on Stratosphere Troposphere Interactions Mohanakumar Kesavapillai Cochin University of Science and Technology Studies on the influence of solar activity in 11-year cycle on wind and temperature pattern at various altitude levels in the troposphere and stratosphere have been carried out based on the ECMWF global reanalysis data. The study covers all latitude zones at 10 degree latitude by 30 degree longitude areas over the entire globe and in the vertical levels, lower-, middle- and upper-troposphere, tropopause, lower-, middle- and upper- stratosphere. The long-term trend and short period fluctuations were removed from the data series. Solar radio flux at 10.7 cm has been selected as the indicator of solar activity. Stratospheric temperature shows a strong association with solar activity in the 11-year cycle, especially in the upper stratospheric region. Tropical stratosphere gives a consistent and steady link to the changes in solar activity. Temperature in the lower troposphere shows large spatial variability with the solar changes and the effect is seen to be less compared to that of the stratosphere. Increase in the solar radio flux tends to strengthen winter westerlies in the upper stratosphere over the midlatitude and summer easterlies in the middle stratosphere over tropics. Larger variability in the zonal wind is noted near stratopause height. Results obtained from the study indicate that changes of mean zonal wind in the stratosphere are usually associated with changes in wave forcing, and feedbacks which provide a mechanism for coupling between the highly dense and convectively active troposphere and less dense and radiatively driven stratosphere. These results can be incorporated for further understanding on the dynamics interaction between the stratosphere and troposphere in association with the changes in solar activity.
Page 1 and 2:
SCOSTEP 2010 (STP12) Berlin, 12 - 1
Page 3 and 4:
STP12 Abstracts Berlin, 12 - 16 Jul
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110: STP12 Abstracts Berlin, 12 - 16 Jul
Page 159: STP12 Abstracts Berlin, 12 - 16 Jul
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
show all

scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?