void CnvMapEvalEfield(int Lmax,double *coef,double *plm,
struct CnvGrid *vptr,
double latmin,struct CnvMapData *ptr) {
int i;
double *theta,*phi;
double *etc,*epc;
double lon,lat,tmp=0;
theta=malloc(vptr->num*sizeof(double));
phi=malloc(vptr->num*sizeof(double));
if ((theta==NULL) || (phi==NULL)) return;
for (i=0;i<vptr->num;i++) {
lat=fabs(vptr->lat[i]);
lon=vptr->lon[i];
if ((ptr->lat_shft !=0) || (ptr->lon_shft !=0))
CnvMapCrdShft(&lat,&lon,&tmp,ptr->lat_shft,ptr->lon_shft);
theta[i]=(90.0-lat)*PI/180.0;
phi[i]=lon*PI/180.0;
}
epc=CnvMapEvalPhiCoef(Lmax,coef,theta,vptr->num);
etc=CnvMapEvalThetaCoef(Lmax,coef,theta,vptr->num,fabs(latmin));
CnvMapEvalComponent(Lmax,etc,plm,phi,vptr->num,vptr->ex);
CnvMapEvalComponent(Lmax,epc,plm,phi,vptr->num,vptr->ey);
free(phi);
free(theta);
free(epc);
free(etc);
}
void CnvMapEvalVelocity(int Lmax,double *coef,double *plm,
struct CnvGrid *vptr,
double latmin,struct CnvMapData *ptr) {
int i;
double *theta,*phi;
double *etc,*epc;
double bpolar;
double bmag=-0.5e-4;
double *ex;
double *ey;
double lon,lat,tmp=0;
double vx,vy;
theta=malloc(vptr->num*sizeof(double));
phi=malloc(vptr->num*sizeof(double));
ex=malloc(vptr->num*sizeof(double));
ey=malloc(vptr->num*sizeof(double));
if ((theta==NULL) || (phi==NULL)) return;
for (i=0;i<vptr->num;i++) {
lat=fabs(vptr->lat[i]);
lon=vptr->lon[i];
if ((ptr->lat_shft !=0) || (ptr->lon_shft !=0))
CnvMapCrdShft(&lat,&lon,&tmp,ptr->lat_shft,ptr->lon_shft);
theta[i]=(90.0-lat)*PI/180.0;
phi[i]=lon*PI/180.0;
}
epc=CnvMapEvalPhiCoef(Lmax,coef,theta,vptr->num);
etc=CnvMapEvalThetaCoef(Lmax,coef,theta,vptr->num,fabs(latmin));
CnvMapEvalComponent(Lmax,etc,plm,phi,vptr->num,ex);
CnvMapEvalComponent(Lmax,epc,plm,phi,vptr->num,ey);
for (i=0;i<vptr->num;i++) {
if (ptr->hemisphere == -1) bpolar = BNorth;
else bpolar = BSouth;
bmag = bpolar*(1.0 - 3.0 * Altitude/Re)*
sqrt(3.0*(cos(theta[i])*cos(theta[i])) + 1.0)/2.0;
vx=ey[i]/bmag;
vy=-ex[i]/bmag;
vptr->mag[i]=sqrt(vx*vx+vy*vy);
vptr->azm[i]=atan2(vy,-vx)*180.0/PI;
if (ptr->hemisphere==-1) vptr->azm[i]=atan2(vy,vx)*180.0/PI;
}
free(ex);
free(ey);
free(phi);
free(theta);
free(epc);
free(etc);
}